判断滑动方向UITableView
-(void)scrollViewWillBeginDragging:(UIScrollView*)scrollView{
lastContentOffset = scrollView.contentOffset.y;
-( void )scrollViewDidScroll:( UIScrollView *)scrollView {
if (scrollView.
contentOffset.y < lastContentOffset )
[ self.navigationController
setNavigationBarHidden : NO
animated : YES ];
if (scrollView. contentOffset.y >
lastContentOffset )
[ self.navigationController
setNavigationBarHidden : YES
animated : YES ];UIScrollerView滚动方向判断
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UIScrollerView滚动方向判断
PushListView.h@interface PushListView : UIView&UITableViewDelegate,UITableViewDataSource{&&& & CGFloat contentOffsetY; & & &&CGFloat oldContentOffsetY; & & & CGFloat newContentOffsetY;}...............................PushListView.m
//开始拖拽视图 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView { & & contentOffsetY = scrollView.contentOffset.y; } &// 滚动时调用此方法(手指离开屏幕后) - (void)scrollViewDidScroll:(UIScrollView *)scrollView { & & //NSLog(@"scrollView.contentOffset:%f, %f", scrollView.contentOffset.x, scrollView.contentOffset.y); & & newContentOffsetY = scrollView.contentOffset.y; && & & & if (newContentOffsetY & oldContentOffsetY && oldContentOffsetY & contentOffsetY) {& // 向上滚动 && & & & & & & & NSLog(@"up"); && & & & & & } else if (newContentOffsetY & oldContentOffsetY && oldContentOffsetY & contentOffsetY) { // 向下滚动 & & & & & & & NSLog(@"down"); & & } else { & & & & & & & & NSLog(@"dragging"); & & } && & & & if (scrollView.dragging) {& // 拖拽 && & & & & & & & NSLog(@"scrollView.dragging"); && & & & & & & & NSLog(@"contentOffsetY: %f", contentOffsetY); & & & & NSLog(@"newContentOffsetY: %f", scrollView.contentOffset.y); && & & & & & & & if ((scrollView.contentOffset.y - contentOffsetY) & 5.0f) {& // 向上拖拽 && & & & & & & & & & & & // 隐藏导航栏和选项栏 & & & & & & // [self layoutView]; & & & & & & [_viewController.navigationController setNavigationBarHidden:YES animated:YES]; & & & & & & //[_viewController.navigationController setToolbarHidden:!hidden animated:YES]; & & & & & & _viewController.tabBarController.tabBar.hidden = YES; && & & & & & & & & & } else if ((contentOffsetY - scrollView.contentOffset.y) & 5.0f) { & // 向下拖拽 && & & & & & & & & & // 显示导航栏和选项栏 & & & & & & //[self layoutView]; && & & & & & & & & & & & [_viewController.navigationController setNavigationBarHidden:NO animated:YES]; & & & & & & //[_viewController.navigationController setToolbarHidden:NO animated:YES]; & & & & & & _viewController.tabBarController.tabBar.hidden = NO; && & & & & & & & & & } else { && & & & & & & & & & } & & }} // 完成拖拽(滚动停止时调用此方法，手指离开屏幕前) - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate { & & // NSLog(@"scrollViewDidEndDragging"); & & oldContentOffsetY = scrollView.contentOffset.y; }
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