本文介绍了检查 UIScrollView 是否到达顶部或底部的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!
问题描述
有没有办法知道 UIScrollView
是到达顶部还是底部?可能在方法中:
Is there a way to know if a UIScrollView
has reached the top or bottom? Possibly in the method:
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView
willDecelerate:(BOOL)decelerate
推荐答案
在你的类中实现UIScrollViewDelegate
,然后添加:
Implement the UIScrollViewDelegate
in your class, and then add this:
-(void)scrollViewDidScroll: (UIScrollView*)scrollView
{
float scrollViewHeight = scrollView.frame.size.height;
float scrollContentSizeHeight = scrollView.contentSize.height;
float scrollOffset = scrollView.contentOffset.y;
if (scrollOffset == 0)
{
// then we are at the top
}
else if (scrollOffset + scrollViewHeight == scrollContentSizeHeight)
{
// then we are at the end
}
}
希望这就是你所追求的!否则,通过在上面的代码中添加更多条件和 NSLog 滚动偏移的值来进行修补.
Hope this is what you are after! Else have a tinker by adding more conditions to the above code and NSLog the value of scrollOffset.
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