你如何知道在 touchesBegan 中被触摸的对象是什么?

How do you tell what object is being touched in touchesBegan?(你如何知道在 touchesBegan 中被触摸的对象是什么?)

问题描述

我知道这是一个非常常见的问题，但是每个网站上的所有答案都不起作用！如果你还是不明白我的意思，那么也许这行代码可以帮助你理解.

I know that this is a very commonly asked question, but all of the answers on every website don't work! If you still don't know what I mean, then maybe this line of code will help you understand.

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint location = [touch locationInView:self.view];
    if (touch.view == nextbutton)
        [self performSelector:@selector(next)];
    if (touch.view == prevbutton)
        [self performSelector:@selector(previous)];
    if (touch.view == moreoptionsbutton)
        [self performSelector:@selector(moresettings)];
}

当你触摸 nextbutton、prevbutton 和 more optionsbutton 时，它不会做任何事情，顺便说一下，它们是 UIImageViews.我也尝试过使用 isEqual: 而不是 ==，但这也没有成功.有什么建议吗?

It doesn't do anything when you touch nextbutton, prevbutton, and more optionsbutton, which are UIImageViews by the way. I have also tried using isEqual: instead of ==, but that hasn't worked out either. Any suggestions?

推荐答案

你必须为你所有的 UIImageViews 设置 userinteractionEnabled = YES 否则他们将不会收到触摸事件.同时换行:

You have to set userinteractionEnabled = YES for all your UIImageViews otherwise they will not receive touch events. Also change the line:

 UITouch *touch = [[event allTouches] anyObject];

到

 UITouch *touch = [touches anyObject];

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