UIScrollView控件的常用属性与<UIScrollViewDelegate>协议中各个方法的触发时机

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1.创建一个UIScrollView对象,并改变背景颜色

UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(20, 20, 280, 528)]; 

scrollView.backgroundColor = [UIColor orangeColor];  

scrollView.tag = 200;
[self.view addSubview:scrollView];

[scrollView release];

2.设置内容页的大小(如果想要视图滑动,内容页大小必须要比scrollView的大小大)
scrollView.contentSize = CGSizeMake(500, 600);

3.创建一个UIImageView,用来显示图片

UIImageView *image = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 280, 528)]; 

image.tag = 100; 

image.image = [UIImage imageNamed:@"1.jpg”];("1.jpg”,图片名)
[scrollView addSubview:image];[image release];

4.设置内容区域的偏移量
scrollView.contentOffset = CGPointMake(300, 0);

5.设置视图能否滑动(YES,能滑动;NO不能滑动)

scrollView.scrollEnabled = NO;

6.内容区域相对于frame在哪显示

scrollView.contentInset = UIEdgeInsetsMake(100, 100, 0, 0);

7.隐藏水平滑动指示器scrollView.showsHorizontalScrollIndicator = NO;
  8.隐藏垂直滑动指示器scrollView.showsVerticalScrollIndicator = NO;

9.关闭滑动效果的回弹效果scrollView.bounces = NO;

10.设置当点击状态条时,scrollView能否滑动到最顶端scrollView.scrollsToTop = YES;   

11.设置scrollView是否可以整屏滑动(一次滑动整个scrollView的大小)

scrollView.pagingEnabled = YES;
12.设置最大缩放比例scrollView.maximumZoomScale = 4.0;

13.设置最小缩放比例scrollView.minimumZoomScale = 1.0;

<UIScrollViewDelegate>协议中方法的触发时机

如果想要哪种效果,只需在相应方法里做操作

只要scrollView滑动就会触发(会触发多次)

- (void)scrollViewDidScroll:(UIScrollView *)scrollView

只要scrollView缩放就会触发

- (void)scrollViewDidZoom:(UIScrollView *)scrollView NS_AVAILABLE_IOS(3_2)

当将要拖拽scrollView时触发,手指结束scrollView并且将要滑动时触发

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView

当结束拖拽时触发(手指将要离开屏幕)

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset NS_AVAILABLE_IOS(5_0)

当结束拖拽时触发(手指已经离开屏幕)

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

当scrollView滑动将要减速时触发(将要停止)

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView

当scrollView结束减速时触发(停止滑动)

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView

当设置scrollView,有一个动画效果时触发

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

设置要缩放的scrollView上面的哪一个子视图,只能是子视图,不能是scrollView本身.

- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView

当将要开始缩放时触发 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)view NS_AVAILABLE_IOS(3_2)

当结束缩放时触发

- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale

只有当scrollsToTop属性设置为YES时,该方法才会触发,进一步询问点击状态条是否有效

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView

当点击状态条并且scrollView滑动到顶端时触发

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView

UIScrollView控件的常用属性与<UIScrollViewDelegate>协议中各个方法的触发时机

标签：style   color   os   io   ar   for   sp   on   size   

原文地址：http://blog.csdn.net/hakusan/article/details/38942279