oOOMIAO 于 2013.05.02 10:37 提问
- 表视图滚动到底部的获取
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iPhone中有表试图。想实现两个功能：
1.用户将表滚动到底部时。
2.用户拉下了tableview时。例如：
If(UserScrollThe tableViewToTop) { perform action: 1 } If(UserScrollThe tableViewToDown) { perform action: 2 }如何获取用户进行了这两个动作？
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zhanglei5415
2013.05.07 09:35
- 已采纳
UITableView is a subclass of UIScrollView, and UITableViewDelegate conforms to UIScrollViewDelegate. So the delegate you attach to the table view will get events such as scrollViewDidScroll:, and you can call methods such as contentOffset on the table view to find the scroll position.
in the tableview delegate do something like this
- (void)scrollViewDidScroll:(UIScrollView *)aScrollView {
CGPoint offset = aScrollView.contentOffset;
CGRect bounds = aScrollView.bounds;
CGSize size = aScrollView.contentSize;
UIEdgeInsets inset = aScrollView.contentInset;
float y = offset.y + bounds.size.height - inset.bottom;
float h = size.height;
// NSLog(@"offset: %f", offset.y);
// NSLog(@"content.height: %f", size.height);
// NSLog(@"bounds.height: %f", bounds.size.height);
// NSLog(@"inset.top: %f", inset.top);
// NSLog(@"inset.bottom: %f", inset.bottom);
// NSLog(@"pos: %f of %f", y, h);
float reload_distance = 10;
if(y > h + reload_distance) {
NSLog(@"load more rows");
}
}
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