如何使用cancelPreviousPerformRequestsWithTarget

Question

我在scrollView中有一个方法：didScroll像这样：

[self.navigationCollectionView moveWhiteLineToPointX:middleX WithWidth:middleWidth animated:NO];

如果用户快速滚动，我不希望多次调用此方法，所以我想使用+cancelPreviousPerformRequestsWithTarget:selector:object

+ (void)cancelPreviousPerformRequestsWithTarget:(id)aTarget selector:(SEL)aSelector object:(id)anArgument

我不知道如何为此API提供正确的参数，尤其是目标和参数。有人可以帮忙吗？

Answer 1

试试这个

[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(scrollViewDidScroll:) object:nil];

Answer 2

取消：

[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(yourSelectorFunction) object:nil];

并且用于调用执行选择器：

[self performSelector:@selector(yourSelectorFunction) withObject:nil afterDelay:0.4];