检查 UIScrollView 是否到达顶部或底部
it1352
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问题说明
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
正确答案
#1
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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