你怎么知道touchesBegan中被触摸的对象？(How do you tell what object is being touched in touchesBegan?)

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)];
}

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?

解决方案

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];

to

 UITouch *touch = [touches anyObject];

• 译文

我知道这是一个非常常见的问题，但每个网站上的所有答案都不起作用！如果您仍然不知道我的意思，那么这行代码可能会帮助您理解。

  
 - （void）touchesBegan：（NSSet *）触及withEvent：（UIEvent *）事件{
 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）]; 
}

当您触摸 nextbutton时它什么都不做，prevbutton和更多选项按钮，顺便说一句是 UIImageViews 。我也尝试使用 isEqual：而不是 == ，但这也没有成功。有什么建议？

解决方案

您必须为所有UIImageView设置userinteractionEnabled = YES，否则他们将不会收到触摸事件。同时更改一行：

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

到

  UITouch * touch = [触及anyObject];