IOS--UIScrollView delegate 协议-

以下为该协议的相关方法：

- (void)scrollViewDidScroll:(UIScrollView *)scrollView;

{

// NSLog(@" scrollViewDidScroll");

NSLog(@"ContentOffset x is %f,yis %f",scrollView.contentOffset.x,scrollView.contentOffset.y);

}

//开始拖拽视图

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewWillBeginDragging");

}

//完成拖拽

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

{

NSLog(@"scrollViewDidEndDragging");

// if (scrollView.contentOffset.x <= 110) {

// [scrollView setContentOffset:CGPointMake(0, 0) animated:YES];

// [ApplicationDelegate setPlayIndex:0];

// return;

// }

// if (scrollView.contentOffset.x > ( 110 + 210 * (ApplicationDelegate.programCount-2)))

// {

// [scrollView setContentOffset:CGPointMake(210 + 210 * (ApplicationDelegate.programCount-2), 0) animated:YES];

// [ApplicationDelegate setPlayIndex:ApplicationDelegate.programCount-1];

// return;

// }

for(int i = 0 ; i < ApplicationDelegate.programCount-2 ; i++){

if (scrollView.contentOffset.x > (110 + i * 210) && scrollView.contentOffset.x <= ( 110 + 210 * (i+1)))

{

[scrollView setContentOffset:CGPointMake(210 + 210 * i, 0) animated:YES];

[ApplicationDelegate setPlayIndex:i+1];

NSLog(@"%d" , i);

//return;

}

//将开始降速时

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewWillBeginDecelerating");

}

//减速停止了时执行，手触摸时执行执行

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewDidEndDecelerating");

if (scrollView.contentOffset.x <= 110) {

[scrollView setContentOffset:CGPointMake(0, 0) animated:YES];

[ApplicationDelegate setPlayIndex:0];

return;

}

if (scrollView.contentOffset.x > ( 110 + 210 * (ApplicationDelegate.programCount-2)))

{

[scrollView setContentOffset:CGPointMake(210 + 210 * (ApplicationDelegate.programCount-2), 0) animated:YES];

[ApplicationDelegate setPlayIndex:ApplicationDelegate.programCount-1];

NSLog(@"over");

return;

}

for(int i = 0 ; i < ApplicationDelegate.programCount-2 ; i++){

if (scrollView.contentOffset.x > (110 + i * 210) && scrollView.contentOffset.x <= ( 110 + 210 * (i+1)))

{

[scrollView setContentOffset:CGPointMake(210 + 210 * i, 0) animated:YES];

[ApplicationDelegate setPlayIndex:i+1];

//return;

}

//滚动动画停止时执行,代码改变时出发,也就是setContentOffset改变时

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewDidEndScrollingAnimation");

}

//设置放大缩小的视图，要是uiscrollview的subview

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

{

NSLog(@"viewForZoomingInScrollView");

return nil;

}

//完成放大缩小时调用

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

{

NSLog(@"scale between minimum and maximum. called after any 'bounce' animations");

}// scale between minimum and maximum. called after any 'bounce' animations

//如果你不是完全滚动到滚轴视图的顶部，你可以轻点状态栏，那个可视的滚轴视图会一直滚动到顶部，那是默认行为，你可以通过该方法返回NO来关闭它

- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewShouldScrollToTop");

return YES;

}

- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView;

{

NSLog(@"scrollViewDidScrollToTop");

}

注意还要对使用的ScrollView进行属性设置

// scrollView的长宽设置

self.programScrollView.contentSize=CGSizeMake(ApplicationDelegate.programCount * 210+10 , 40);

// 是否分页显示

self.programScrollView.pagingEnabled=NO;

//协议

self.programScrollView.delegate=self;

// 监听手指动作

self.programScrollView.canCancelContentTouches=NO;

//延迟手指动作

self.programScrollView.delaysContentTouches=YES;

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