IOS：许多scrollViews的委托

Question

我有这段代码：

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

[NSObject cancelPreviousPerformRequestsWithTarget:self];
[self performSelector:@selector(scrollViewDidEndScrollingAnimation:) withObject:nil afterDelay:0.01];



}

- (void) scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
[NSObject cancelPreviousPerformRequestsWithTarget:self];



if (scrollView == scrollV){
    NSLog(@"scroll di scrollV"); 
}
}

我不明白为什么它不能在控制台“scroll di scrollV”中打印，我为scrollV设置了委托，但它不起作用

Answer 1

你想要这个吗？：

[self performSelector:@selector(scrollViewDidEndScrollingAnimation:) withObject:scrollView afterDelay:0.01];

您没有传递scrollView对象，因此if (scrollView == scrollV)永远不会被击中，除非scrollV是nil，我猜它不是。{/ p>