UIScrollView 使用

最新推荐文章于 2021-05-21 15:33:54 发布

原创最新推荐文章于 2021-05-21 15:33:54 发布 · 335 阅读

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本文详细介绍了如何使用UIScrollView进行界面初始化，并实现各种滚动视图代理方法，包括但不限于缩放、拖动和滑动等交互操作。

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- (void)initUI {
scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
scrollView.delegate = self;
scrollView.contentSize = CGSizeMake(320, 460*10);
[scrollView flashScrollIndicators];
scrollView.directionalLockEnabled = YES;
[self.view addSubview:scrollView];

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 120, 30)];
label.text = @"test";
[scrollView addSubview:label];
[label release];

}

#pragma mark - scrollViewDelegate

// 返回一个放大或者缩小的视图
- (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView
{

}
// 开始放大或者缩小
- (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:
(UIView *)view
{

}
// 缩放结束时
- (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(float)scale
{

}
// 视图已经放大或缩小
- (void)scrollViewDidZoom:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidScrollToTop");
}

// 是否支持滑动至顶部
- (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView
{
return YES;
}

// 滑动到顶部时调用该方法
- (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidScrollToTop");
}

// scrollView 已经滑动
- (void)scrollViewDidScroll:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidScroll");
}

// scrollView 开始拖动
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
NSLog(@"scrollViewWillBeginDragging");
}

// scrollView 结束拖动
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
NSLog(@"scrollViewDidEndDragging");
}

// scrollView 开始减速
- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView
{
NSLog(@"scrollViewWillBeginDecelerating");
}

// scrollview 减速停止
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
NSLog(@"scrollViewDidEndDecelerating");
}