Object&C&字符串和数组NSString&NSArray操作&(转）
给下面一个这样的字符串去处理让人好头大,在java里的处理貌似很简单,&ArrayList&String&貌似就解决的差不多了&
*str=@"#32@?????????????@002@@
11:25:24.@??????????????@002@@
15:51:57.@?????????????? ??????@002@@
22:04:52.@?????917????6? 11????09-12-12
22:02:31.@?????????????????700??@002@@
22:00:26.393976*#";
//创建字符串对象数组
&NSArray *array = [str
componentsSeparatedByString:@"@"];//就是以@为标示 输出看看啦
&int count=[array count];
&for(i=0;i&i=i+4)
& printf("%i:&
%s\n",i,[[array objectAtIndex:i] UTF8String]);
2 &可变的字符串类
&NSMutableString
*song=[[NSMutableString alloc] init];
&[song appendString:@"Deaf
Leppard"];
&printf("%s\n",[song
UTF8String]);
&NSRange range=[song
rangeOfString:@"Deaf"];//获取字符串"Deaf"字串的范围
replaceCharactersInRange:range
withString:@"Def"];//替换&
&printf("%s\n",[song
UTF8String]);
&[song insertString:@"Animal by "
atIndex:0];
&printf("%s\n",[song
UTF8String]);
&[song release];
字典加数组操作
&NSArray *keys=[@"one two three"
componentsSeparatedByString:@" "];
&NSArray *value=[@"two bravo a"
componentsSeparatedByString:@" "];
&NSDictionary *dic=[[NSDictionary
alloc] initWithObjects:value forKeys:keys];
&printf("%s\n",[[dic description]
UTF8String]);
& & //一、NSString
//1、创建常量字符串。
& & NSString
*astring = @"This is a String!";
//2、创建空字符串，给予赋值。
& & NSString
*astring = [[NSString alloc] init];
& & astring =
@"This is a String!";
& & [astring
NSLog(@"astring:%@",astring);
//3、在以上方法中，提升速度:initWithString方法
& & NSString
*astring = [[NSString alloc] initWithString:@"This is a
String!"];
NSLog(@"astring:%@",astring);
& & [astring
//4、用标准c创建字符串:initWithCString方法
& & char *Cstring
= "This is a String!";
& & NSString
*astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
& & [astring
//5、创建格式化字符串:占位符（由一个%加一个字符组成）
& & int i =
& & int j =
& & NSString
*astring = [[NSString alloc] initWithString:[NSString
stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
& & [astring
//6、创建临时字符串
& & NSString
& & astring =
[NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
& & NSString
*path = @"astring.text";
& & NSString
*astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
& & [astring
& & NSString
*astring = [[NSString alloc] initWithString:@"This is a
String!"];
NSLog(@"astring:%@",astring);
& & NSString
*path = @"astring.text"; & &
& & [astring
writeToFile: path atomically: YES];
& & [astring
release]; & &
//用C比较:strcmp函数
string1[] = "string!";
string2[] = "string!";
if(strcmp(string1, string2) = = 0)
& & NSLog(@"1");
//isEqualToString方法 & &
& & NSString
*astring01 = @"This is a String!";
& & NSString
*astring02 = @"This is a String!";
& & BOOL result =
[astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三种值) &
& & NSString
*astring01 = @"This is a String!";
& & NSString
*astring02 = @"This is a String!"; &
& & BOOL result =
[astring01 compare:astring02] = = NSOrderedS &
NSLog(@"result:%d",result); &
//NSOrderedSame判断两者内容是否相同
& & NSString
*astring01 = @"This is a String!";
& & NSString
*astring02 = @"this is a String!";
& & BOOL result =
[astring01 compare:astring02] = = NSOrderedA
NSLog(@"result:%d",result);
//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
& & NSString
*astring01 = @"this is a String!";
& & NSString
*astring02 = @"This is a String!";
& & BOOL result =
[astring01 compare:astring02] = = NSOrderedD
NSLog(@"result:%d",result);& &
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串1
& & NSString
*astring01 = @"this is a String!";
& & NSString
*astring02 = @"This is a String!";
& & BOOL result =
[astring01 caseInsensitiveCompare:astring02] = = NSOrderedS
NSLog(@"result:%d",result);& &
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串2
& & NSString
*astring01 = @"this is a String!";
& & NSString
*astring02 = @"This is a String!";
& & BOOL result =
[astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = =
NSOrderedS & &
NSLog(@"result:%d",result);& &
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写
NSNumericSearch:比较字符串的字符个数，而不是字符值。
& & NSString
*string1 = @"A String";&
& & NSString
*string2 = @"String";&
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
& & NSString
*string1 = @"This is a string";
& & NSString
*string2 = @"string";
& & NSRange range
= [string1 rangeOfString:string2];
& & int location
& & int leight =
& & NSString
*astring = [[NSString alloc] initWithString:[NSString
stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
& & [astring
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
& & NSString
*string1 = @"This is a string";
& & NSString
*string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
& & NSString
*string1 = @"This is a string";
& & NSString
*string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
& & NSString
*string1 = @"This is a string";
& & NSString
*string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
& & //扩展路径
& & NSString
*Path = @"~/NSData.txt";
& & NSString
*absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath
stringByAbbreviatingWithTildeInPath]);
& & //文件扩展名
& & NSString
*Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
//stringWithCapacity:
NSMutableString *S
& & String =
[NSMutableString stringWithCapacity:40];
//appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc]
initWithString:@"This is a NSMutableString"];
& & //[String1
appendString:@", I will be adding some character"];
& & [String1
appendFormat:[NSString stringWithFormat:@", I will be adding some
character"]];
NSLog(@"String1:%@",String1);
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc]
initWithString:@"This is a NSMutableString"];
& & [String1
insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc]
initWithString:@"This is a NSMutableString"];
& & [String1
setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
//-setString:
NSMutableString *String1 = [[NSMutableString alloc]
initWithString:@"This is a NSMutableString"];
& & [String1
replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
//01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aS
& & NSString
*String1 = @"NSStringInformation.txt";
& & [String1
hasPrefix:@"NSString"] = = 1 ?& NSLog(@"YES") :
NSLog(@"NO");
& & [String1
hasSuffix:@".txt"] = = 1 ?& NSLog(@"YES") :
NSLog(@"NO");
//02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *)
aString，这一点前面在串中搜索子串用到过;
& & //NSArray
*array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray =
& & [array
(unsigned) C数组所包含对象个数；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
& & //- (id)
objectAtIndex: (unsigned int)获取指定索引处的对象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray
objectAtIndex:2]);
//arrayWithArray:
& & //NSArray
*array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
& & NSArray
*array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
& & MutableArray
= [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
& & array1 =
[NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
& & //Copy
NSMutableArray *newArray = [[NSMutableArray alloc] init];
& & NSArray
*oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
& & for(int i =
0; i & [oldArray count]; i++)
& & obj = [[oldArray
objectAtIndex:i] copy];
& & [newArray addObject:
NSLog(@"newArray:%@", newArray);
& & [newArray
& & //快速枚举
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
& & NSArray
*oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil]; &
NSLog(@"oldArray:%@",oldArray);
& & for(id obj in
& & [newArray addObject:
NSLog(@"newArray:%@", newArray);
& & [newArray
release]; & &
& & //Deep
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
& & NSArray
*oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil]; &
NSLog(@"oldArray:%@",oldArray); &
& & newArray =
(NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault,
(CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
NSLog(@"newArray:%@", newArray);
& & [newArray
release]; & &
& & //Copy and
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
& & NSArray
*oldArray = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil]; &
NSLog(@"oldArray:%@",oldArray);
& & NSEnumerator
& & enumerator =
[oldArray objectEnumerator];
& & while(obj =
[enumerator nextObject])
& & [newArray addObject:
& & [newArray
sortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
& & [newArray
& & //从字符串分割到数组－
componentsSeparatedByString:
& & NSString
*string = [[NSString alloc]
initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string); &
& & NSArray
*array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
& & [string
//从数组合并元素到字符串- componentsJoinedByString:
& & NSArray
*array = [[NSArray alloc]
initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
& & NSString
*string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
& & //NSArray
& & array =
[NSMutableArray arrayWithCapacity:20];
& & //- (void)
addObject: (id) anO
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
& & [array
addObject:@"Four"];
NSLog(@"array:%@",array);
& & //-(void)
removeObjectAtIndex: (unsigned) &
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
& & [array
removeObjectAtIndex:1];
NSLog(@"array:%@",array);
(NSEnumerator *)objectE从前向后
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
& & NSEnumerator
& & enumerator =
[array objectEnumerator];
(thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
(NSEnumerator *)reverseObjectE从后向前
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
& & NSEnumerator
& & enumerator =
[array reverseObjectEnumerator];
& & while (object
= [enumerator nextObject]) {
NSLog(@"object:%@",object);
& & //快速枚举
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
& & for(NSString
*string in array)
NSLog(@"string:%@",string);
& & //- (id)
initWithObjectsAndK
//NSDictionary *dictionary = [[NSDictionary alloc]
initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
& & NSString
*string = [dictionary objectForKey:@"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
& & [dictionary
& & //创建
NSMutableDictionary *dictionary = [NSMutableDictionary
dictionary];
& & //添加字典
& & [dictionary
setObject:@"One" forKey:@"1"];
& & [dictionary
setObject:@"Two" forKey:@"2"];
& & [dictionary
setObject:@"Three" forKey:@"3"];
& & [dictionary
setObject:@"Four" forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);
& & //删除指定的字典
& & [dictionary
removeObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);
//将NSRect放入NSArray中
NSMutableArray *array = [[NSMutableArray alloc] init];
& & NSValue
& & CGRect rect =
CGRectMake(0, 0, 320, 480); &
& & value =
[NSValue valueWithBytes:&rect
objCType:@encode(CGRect)];
& & [array
addObject:value];
NSLog(@"array:%@",array);
//从Array中提取
& & value =
[array objectAtIndex:0];
& & [value
getValue:&rect];
NSLog(@"value:%@",value);
//NSFileManager *fileManager = [NSFileManager defaultManager];
& & NSString
& & home =
@"../Users/";
NSDirectoryEnumerator *
& & direnum =
[fileManager enumeratorAtPath: home];
NSMutableArray *files = [[NSMutableArray alloc] init];
& & //枚举
& & NSString
(filename = [direnum nextObject]) {
& & if([[filename pathExtension]
hasSuffix:@"jpg"]){
& [files addObject:filename];
& & //快速枚举
//for(NSString *filename in direnum)
//& & if([[filename
pathExtension] isEqualToString:@"jpg"]){
& [files addObject:filename];
NSLog(@"files:%@",files);
& & //枚举
& & NSEnumerator
& & filenum =
[files objectEnumerator];
(filename = [filenum nextObject]) {
NSLog(@"filename:%@",filename);
& & //快速枚举
& & //for(id
object in files)
NSLog(@"object:%@",object);
已投稿到：
以上网友发言只代表其个人观点，不代表新浪网的观点或立场。首先讲objective-c如何实现：
这里需要用到2个，一个是JSONKit，另一个是Jastor，一共包含6个文件，3个.h头文件和3个.m实现文件。在ARC的工程中如何导入不支持ARC的第三方工具请看这篇文章：
具体文件在网上都比较好找，自己去下载即可。
NSObject类型的json字符串转换为对象
大体的思路是这样，首先将json字符串先转化成NSDictionary，然后再通过参数是NSDictionary的初始化方法来生成相应的对象。
其中生成NSDictionary的过程是由JSONKit提供的NSString的objectFromJSONString方法来完成的。
而将NSDictionary生成相应对象的过程是有Jastor来完成，这个过程有几个要求：
你的对象必须继承Jastor对象；
你的对象的属性名必须和json字符串的属性名称对应；
如果你的对象中包含自定义对象的列表，则需要为这个属性单独写一个类方法，规则是"属性名_class";
例子如下：
JSON字符串的结构如下图：
其中包含一个班级的信息，和班级中的3个学生的信息。
对应的数据结构如下：
BMclass.h：
@interface BMClass : Jastor
@property (strong,nonatomic) NSString*
@property (strong,nonatomic) NSString*
@property (strong,nonatomic) NSArray*
+(id)students_
BMclass.m:
@implementation BMClass
@synthesize name,grade,
+(id)students_class{
return [BMStudent class];
BMStudent.h:
@interface BMStudent : Jastor
@property (strong,nonatomic) NSString*
@property (strong,nonatomic) NSString*
@property (nonatomic)
BMStudent.m:
@implementation BMStudent
@synthesize name,age,
具体的解析代码如下：
NSDictionary* dic = [jsonStr objectFromJSONString];
BMClass* c = [[BMClass alloc]initWithDictionary:dic];
运行后的解析的结果如下图（Debug的截图）：
NSArray类型的json字符串转换为对象&
如果您获得的字符串不是"{}"类型的，而是"[]"类型的，那么以上的解析方式不适用，需要将
NSDictionary* dic = [jsonStr objectFromJSONString];
NSArray* array = [jsonStr objectFromJSONString];
这时获得的数组是JKDictionary类型，如下；
要想将array中的对象转换成自己的对象，需要再遍历一边数组，使用
BMClass* c = [[BMClass alloc]initWithDictionary:dic];
为每个对象进行转换即可。
=================================这是分割线=========================================
现在讲java如何实现：
java下需要用到一个包。
java下解析json利用gson比iOS下略简单，思路是获取到要解析的对象的Type，然后利用GSON提供的fromJson方法解析就好了。
沿用上边iOS的json字符串举例：
BMClass.class代码如下：
public class BMClass {
public List&BMStudent&
BMStudent.class代码如下：
public class BMStudent {
Object类型的json字符串转换为对象
解析的过程代码如下：
Gson gson = new Gson();
Type classType = new TypeToken&BMClass&() {}.getType();
BMClass c = gson.fromJson(jsonStr, classType);
解析的结果如下（Debug截图）：
List类型的json字符串转换为对象
解析的地方只更换Type的类型即可，例如：
Type classType = new TypeToken&List&BMClass&&() {}.getType();
文章结束。
阅读(...) 评论()Objective-c史上最全字符串处理
//将NSData转化为NSString
NSString* str = [[NSString alloc] initWithData:response encoding:NSUTF8StringEncoding];
//将NSString 转化为NSData
(NSString.h)
- (NSData *)dataUsingEncoding:(NSStringEncoding)
//载一个字符串中删除一个字符或字符串
[_display deleteCharactersInRange:NSMakeRange(index_of_char_to_remove, 1)];
数学转换为字符串
NSString *returnS
returnStr = [[NSNumber numberWithInt:row] stringValue];
int转为NSString
for (int Abb_Appid=500001; Abb_Appid<500012; Abb_Appid++) {
NSString *Abb_AppID_ID=[NSString stringWithFormat:@"%d",Abb_Appid];
NSString *tempA = @"123";
NSString *tempB = @"456";
1，字符串拼接
NSString *newString = [NSString stringWithFormat:@"%@%@",tempA,tempB];
2，字符转int
int intString = [newString intValue];
3，int转字符
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];
4，字符转float
float floatString = [newString floatValue];
5，float转字符
NSString *stringFloat = [NSString stringWithFormat:@"%f",intString];
*******************************************************************************************/
//一、NSString
/*----------------创建字符串的方法----------------*/
//1、创建常量字符串。
NSString *astring = @"This is a String!";
//2、创建空字符串，给予赋值。
NSString *astring = [[NSString alloc] init];
astring = @"This is a String!";
[astring release];
NSLog(@"astring:%@",astring);
//3、在以上方法中，提升速度:initWithString方法
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
[astring release];
//4、用标准c创建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、创建格式化字符串:占位符（由一个%加一个字符组成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、创建临时字符串
NSString *
astring = [NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------写字符串到文件:writeToFile方法----------------*/
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
/*----------------比较两个字符串----------------*/
//用C比较:strcmp函数
char string1[] = "string!";
char string2[] = "string!";
if(strcmp(string1, string2) = = 0)
NSLog(@"1");
//isEqualToString方法
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三种值)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedS
NSLog(@"result:%d",result);
//NSOrderedSame判断两者内容是否相同
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedA
NSLog(@"result:%d",result);
//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedD
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串1
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedS
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串2
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedS
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
/*----------------改变字符串的大小写----------------*/
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
/*----------------在串中搜索子串----------------*/
NSString *string1 = @"This is a string";
NSString *string2 = @"string";
NSRange range = [string1 rangeOfString:string2];
int location = range.
int leight = range.
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------抽取子串 ----------------*/
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//扩展路径
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//文件扩展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
/*******************************************************************************************
NSMutableString
*******************************************************************************************/
/*---------------给字符串分配容量----------------*/
//stringWithCapacity:
NSMutableString *S
String = [NSMutableString stringWithCapacity:40];
/*---------------在已有字符串后面添加字符----------------*/
//appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
//[String1 appendString:@", I will be adding some character"];
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
NSLog(@"String1:%@",String1);
/*--------在已有字符串中按照所给出范围和长度删除字符------*/
//deleteCharactersInRange:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 deleteCharactersInRange:NSMakeRange(0, 5)];
NSLog(@"String1:%@",String1);
/*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
/*--------将已有的空符串换成其它的字符串------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
/*--------按照所给出的范围，和字符串替换的原有的字符------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is
a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
//01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aS
NSString *String1 = @"NSStringInformation.txt";
[String1 hasPrefix:@"NSString"] = = 1 ?
NSLog(@"YES") : NSLog(@"NO");
[String1 hasSuffix:@".txt"] = = 1 ?
NSLog(@"YES") : NSLog(@"NO");
//02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，这一点前面在串中搜索子串用到过;
/*******************************************************************************************
*******************************************************************************************/
/*---------------------------创建数组------------------------------*/
//NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray =
[array release];
//- (unsigned) C数组所包含对象个数；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
//- (id) objectAtIndex: (unsigned int)获取指定索引处的对象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
/*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
//arrayWithArray:
//NSArray *array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
NSArray *array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray = [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
array1 = [NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(int i = 0; i < [oldArray count]; i++)
obj = [[oldArray objectAtIndex:i] copy];
[newArray addObject: obj];
NSLog(@"newArray:%@", newArray);
[newArray release];
//快速枚举
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(id obj in oldArray)
[newArray addObject: obj];
NSLog(@"newArray:%@", newArray);
[newArray release];
//Deep copy
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
NSLog(@"newArray:%@", newArray);
[newArray release];
//Copy and sort
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator *
enumerator = [oldArray objectEnumerator];
while(obj = [enumerator nextObject])
[newArray addObject: obj];
[newArray sortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
[newArray release];
/*---------------------------切分数组------------------------------*/
//从字符串分割到数组－ componentsSeparatedByString:
NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArray *array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];
//从数组合并元素到字符串- componentsJoinedByString:
NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString *string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
/*******************************************************************************************
NSMutableArray
*******************************************************************************************/
/*---------------给数组分配容量----------------*/
//NSArray *
array = [NSMutableArray arrayWithCapacity:20];
/*--------------在数组末尾添加对象----------------*/
//- (void) addObject: (id) anO
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
NSLog(@"array:%@",array);
/*--------------删除数组中指定索引处对象----------------*/
//-(void) removeObjectAtIndex: (unsigned)
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array removeObjectAtIndex:1];
NSLog(@"array:%@",array);
/*-------------数组枚举---------------*/
//- (NSEnumerator *)objectE从前向后
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *
enumerator = [array objectEnumerator];
while (thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
//- (NSEnumerator *)reverseObjectE从后向前
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *
enumerator = [array reverseObjectEnumerator];
while (object = [enumerator nextObject]) {
NSLog(@"object:%@",object);
//快速枚举
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSString *string in array)
NSLog(@"string:%@",string);
/*******************************************************************************************
NSDictionary
*******************************************************************************************/
/*------------------------------------创建字典------------------------------------*/
//- (id) initWithObjectsAndK
//NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSString *string = [dictionary objectForKey:@"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
[dictionary release];
/*******************************************************************************************
NSMutableDictionary
*******************************************************************************************/
/*------------------------------------创建可变字典------------------------------------*/
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
//添加字典
[dictionary setObject:@"One" forKey:@"1"];
[dictionary setObject:@"Two" forKey:@"2"];
[dictionary setObject:@"Three" forKey:@"3"];
[dictionary setObject:@"Four" forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);
//删除指定的字典
[dictionary removeObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);
/*******************************************************************************************
NSValue（对任何对象进行包装）
*******************************************************************************************/
/*--------------------------------将NSRect放入NSArray中------------------------------------*/
//将NSRect放入NSArray中
NSMutableArray *array = [[NSMutableArray alloc] init];
CGRect rect = CGRectMake(0, 0, 320, 480);
value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
[array addObject:value];
NSLog(@"array:%@",array);
//从Array中提取
value = [array objectAtIndex:0];
[value getValue:&rect];
NSLog(@"value:%@",value);
/*******************************************************************************************
从目录搜索扩展名为jpg的文件
*******************************************************************************************/
//NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *
home = @"../Users/";
NSDirectoryEnumerator *
direnum = [fileManager enumeratorAtPath: home];
NSMutableArray *files = [[NSMutableArray alloc] init];
NSString *
while (filename = [direnum nextObject]) {
if([[filename pathExtension] hasSuffix:@"jpg"]){
[files addObject:filename];
//快速枚举
//for(NSString *filename in direnum)
if([[filename pathExtension] isEqualToString:@"jpg"]){
[files addObject:filename];
NSLog(@"files:%@",files);
NSEnumerator *
filenum = [files objectEnumerator];
while (filename = [filenum nextObject]) {
NSLog(@"filename:%@",filename);
//快速枚举
//for(id object in files)
NSLog(@"object:%@",object);
int main (int argc, const char * argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
//创建字符串
NSString *
/**类方法：
+(id) stringWithFormat: (NSString *) format,...
通过格式字符串和参数来创建NSString
省略号（。。。）：可以接受多个以逗号分割的参数。
这声明方法时添加加号（＋），那么这个方法为类方法，不需要创建实例就可以调用，通常用于创建心的实例，我们称用来创建新对象的类方法为工厂方法。
－－－－－－－－－－－－－－－－－－－
objective－c运行时生成一个类的时候，它会创建一个代表该类的类对象。类对象包含了指向超类的指针，类名，和指向类方法列表的指针。类对象还包含一个long型数据，为新创建的类实例对象指定大小（以字节为单位）
类方法可以用来访问全局数据。
实例方法要用前导减号（－）来开始声明
height=[NSString stringWithFormat:@"you heigh is %d feet,%d inches",5,11];
NSLog(height);
//length 返回字符串中字符的个数。－（unsigned int)
if([height length]>5){
NSLog(@"height length ------");
//字符串比较
isEqualToString :可以用来比较接收方和当作参数传递来的字符串的内容是否相同，返回yes和no
NSString *thing1=@"hello";
NSString *thing2=[[NSString alloc] initWithString:@"hello"];
if([thing1 isEqualToString:thing2]){
NSLog(@"they are same");
==:只判断指针数值，而不是它们所指向的内容
if(thing1==thing2){
NSLog(@"== same");
compare:比较两个字符串。区分大小写
compare将接收对象和传递来的字符串逐个字符的进行比较，它返回一个NSComparisonResult(枚举类型)来显示结果。
typedef enum _NSComparisonResult{
NSOrderedAscending=-1;
NSOrderedD
} NSComparisonR
[thing1 compare:thing2];
if(NSOrderedSame==[thing1 compare:thing2]){
NSLog(@"compare same");
//compare：options:
-(NSComparisonResult) compare:(NSString *) string
options:(unsinged)
options 是一个位掩码，可以使用|添加选项标记
NSCaseInsensitiveSearch:不区分大小写字符
NSLiteralSearch:进行完全比较，区分大小写
NSNumbericSearch:比较字符串的字符个数，而不是字符值
if([thing1 compare:thing2 options:NSCaseInsensitiveSearch|
NSNumericSearch]==NSOrderedSame){
NSLog(@"they match");
以某个字符串开始或结尾
-(BOOL) hasPrefix:(NSString *) aS
-(BOOL) hasSuffix:(NSString *) aS
NSString *fileName=@"aabbbcc";
if([fileName hasPrefix:@"aa"]){
NSLog(@"begin with aa");
if([fileName hasSuffix:@"cc"]){
NSLog(@"end with cc");
//NSMutableString 可变字符串
//SString 是不可变的，一旦NSString 被创建了，我们就不能改变它。
//+(id) stringWithCapacity:(unsinged) capacity:是给NSMutableString的一个建议，字符串的大小并不局限于所提供的大小，这个容量仅是个最优值。
NSMutableString *str=[NSMutableString stringWithCapacity:40];
[str appendFormat:@"sdfsdf%d",5];
[str appendString:@"ssssssss"];
NSLog(str);
//删除字符串
//-(void) deleteCharactersInRange:(NSRange)
NSMutableString *
ms=[NSMutableString stringWithCapacity:50];
[ms appendString:@"aabbccdd"];
range=[ms rangeOfString:@"cc"];
[ms deleteCharactersInRange:range];
NSLog(ms);
//与实例方法一样，继承对类方法也同样适用
//------------------集合－－－－－－－－－－－－－－
//NSArray ,NSDictionary
NSArray 是一个cocoa类，用来存储对象的有序列表。
NSArray有两个限制：1，它只能存储objective－c的对象，而不能存储中的基本数据类型如int，float，enum，struct，或者nsarray中的随机指针。2，不能这nsarray中存储nil
arrayWithObjects:创建一个新的nsarray。发送一个以逗号分割的对象列表，这列表结尾添加nil代表列表结束，（这就是不能这nsarray中存储nil的原因）
NSArray *array=[NSArray arrayWithObjects:@"aa",@"bb",@"cc",nil];
//-(unsigned) 取得包含对象的个数
//-(id) objectAtIndex:(unsigned int) 取得索引位置的对象
for (i=0; i<[array count]; i++) {
NSLog(@"index %d has %@",i,[array objectAtIndex:i]);
//------------切分数组
//-componentsSeparatedByString:
NSString *ns=@"sdf,dsfs,dfd,fdf,df,dd";
NSArray *comArr=[ns componentsSeparatedByString:@","];
for(int i=0;i<[comArr count];i++){
NSLog(@"componentsSeparatedByString===%@",[comArr objectAtIndex:i]);
//componentJoinedByString: 合并nsarray中的元素来创建字符串
NSString *joinedStr=[comArr componentsJoinedByString:@"-->"];
NSLog(@"joined---= %@",joinedStr);
//可变数组
NSMutableArray *mutableArr=[NSMutableArray arrayWithCapacity:40];
[mutableArr addObject:@"aa"];
[mutableArr addObject:@"bb"];
[mutableArr addObject:@"cc"];
[mutableArr addObject:@"dd"];
for(int i=0;i<[mutableArr count];i++){
NSLog(@"mutableArr==%@",[mutableArr objectAtIndex:i]);
-(void) removeObjectAtIndex:(unsinged) 删除指定索引的对象,
//删除一个对象之后，数组中并没有留下，被删除对象后面的数组元素的哦被前移来填补空缺
[mutableArr removeObjectAtIndex:2];
for(int i=0;i<[mutableArr count];i++){
NSLog(@"removeObjectAtIndex == %@",[mutableArr objectAtIndex:i]);
//NSEnumerator ,它是cocoa用来描述这种集合迭代运输的方法
//-(NSEnumerator *) objectE
NSEnumerator *enumerator=[mutableArr objectEnumerator];
while(thingie=[enumerator nextObject]){
NSLog(@"i found %@",thingie);
//快速枚举
for(NSString *string in mutableArr){
NSLog(@"for in == %@",string);
//NSDictionary 字典
NSDictionary 是在给定的关键字（通常是一个NSString字符串）下存储一个数值（可以是任何类型的对象）。然后你可以用这个关键字来查找相应的数值。
NSDictionary 是键查询的优化存储方式。它可以立即找出要查询的数据，而不需要遍历整个数组进行查找。
＋（id) dictionaryWithObjectAndKeys:(id) firstObject,....;
该方法接收对象和关键字交替出现的系列，以nil值作为终止符号。
NSDictionary *dic=[NSDictionary dictionaryWithObjectsAndKeys:@"aaa",@"a",@"bbb",@"b",nil];
NSString *dicStr=[dic objectForKey:@"a"];
if([dicStr isEqualToString:@"aaa"]){
NSLog(@"------------00000");
//可变字典
NSMutableDictionary *mutableDic=[NSMutableDictionary dictionaryWithCapacity:50];
[mutableDic setObject:@"1111" forKey:@"1"];
[mutableDic setObject:@"222" forKey:@"2"];
//删除 -(void) removeObjectForKe:(id)
[mutableDic removeObjectForKey:@"2"];
NSArray *keyArr=[mutableDic allKeys];
for(NSString *str in keyArr){
NSLog(@"key== %@",str);
NSLog(@"value== %@",[mutableDic objectForKey:str]);
//各种数值，NSNumber NSValue
cocoa 提供了NSNumber类来包装基本数据类型
+(NSNumber *) numberWithChar:(char)
+(NSNumber *) numberWithInt:(int)
+(NSNumber *) numberWithFloat:(float)
+(NSNumber *) numberWthiBool:(BOOL)
-(char) charV
-(int) intV
-(float) floatV
-(BOOL) boolV
-(NSString *) stringV
NSNumber *
number=[NSNumber numberWithInt:3];
[mutableDic setObject:number forKey:@"int"];
int num=[[mutableDic objectForKey:@"int"] intValue];
NSLog(@"int object value== %d",num);
//NSValue .NSNumber实际上是NSValue的子类，NSValue可以包装任意值
+(NSValue *) valueWithBytes:(const void *) value objCType:(const char *)
传递的参数是你想要包装的数值的地址，通常，得到的是你想要存储的变量的地址（在c语言里适用操作符 & ），你也可以提供一个描述这个数据类型的字符串，通常用来说明struct中实体的类型和大小。你不用自己写代码
来生成这个字符串，@encode编译器指令可以接受数据类型的名称并为你生成合适的字符串
NSRect rect= NSMakeRect(1, 2, 30, 40);
value=[NSValue valueWithBytes:&rect objCType:@encode(NSRect)];
NSMutableArray *mr=[NSMutableArray arrayWithCapacity:50];
[mr addObject:value];
//getValue 提取数据
-(void) getValue:(void *) 要传递的是存储这个数值的变量的地址
value=[mr objectAtIndex:0];
NSLog(@"00000 ===%@",r);
[value getValue:&r];
NSLog(@"111== %@",r);
+(NSValue *) valueWithPoint:(NSPoint)
+(NSValue *) valueWithSize:(NSSize)
+(NSValue *) valueWithRect:(NSRect)
-(NSPoint) pointV
-(NSSize) sizeV
-(NSRect) rectV
*+(NSNull *)
[mutableDic setObject:[NSNull null] forKey:@"fax"];
fax=[mutableDic objectForKey:@"fax"];
if(fax==[NSNull null]){
NSLog(@"pppppppppppppppppp");
[pool drain];
