如何以编程方式将UIView或UIImageView与诸如“内部触摸”之类的事件链接？ [英] How can I programmatically link an UIView or UIImageView with an event like "touch up inside"?

问题描述

界面生成器只允许我将这样的事件连接到一个按钮。但是像HTML一样，我只是希望避免一个空白的UIImageView，只要用户点击它 - 调用一个方法。我希望有一些很酷的编程方式，我不知道。

更新：

在我创建UIImageView的View Controller中，我试图这样做：

  SEL actionSelector = @selector（doSomethingWhenImageIsTouched :); 
 [self.myUIImageView addTarget：nil action：actionSelector forControlEvents：UIControlEventTouchUpInside]; 
  

编译器给了我一个警告，UIImageView可能没有回应addTarget：...我该怎么办必须这样做，它与UIImageView一起工作。我在文档中看到UIImageView不能从UIControl继承，但addTarget：是UIControl的一部分。

更新：

我最终在创建UIImageView之后创建了一个UIButton。然后我将该按钮的框架设置为UIImageView的框架，将alpha设置为0.1f。由于某种原因，如果alpha为0.0f，则不起作用。然后，我做了这个很酷的addTarget：事情...

解决方案

在SDK版本3.2（可能早些时候我没有）您可以向UIView添加手势识别器。 UIGestureRecogniser是一个抽象类，允许您定义一个手势（点击，捏，滑动等）并将其添加到UIView中，并且当手势识别器识别手势时，它将触发您对欲望目标的动作。 / p>

在文档中阅读所有内容...：D

Interface Builder will only allow me to hook up such events for an button. But like in HTML, I just want to haven an blank UIImageView where - as soon as the user taps it - a method is invoked. I hope there is some cool programmatically way of doing that, which I don't know about.

UPDATE:

In my View Controller that creates the UIImageView I tried to do this:

SEL actionSelector = @selector(doSomethingWhenImageIsTouched:);
[self.myUIImageView addTarget:nil action:actionSelector forControlEvents:UIControlEventTouchUpInside];

The compiler gives me a warning, that UIImageView may not respond to addTarget:... what do I have to do so that it works with an UIImageView. I see in the docs that UIImageView does not inherit from UIControl, but addTarget: is part of UIControl.

UPDATE:

I ended up creating an UIButton after creating the UIImageView. Then I set the frame of that button to the frame of the UIImageView, and alpha to 0.1f. For some reason, it will not work if alpha is 0.0f. And then, I did that cool addTarget: thing...

解决方案

In SDK version 3.2 (could be earlier i donno), you can add gesture recognizers to a UIView. UIGestureRecogniser is an abstract class that allows you to define a gesture (tap, pinch, swipe, etc) and add it to a UIView and when the gesture recognizer, recognizes the gesture, it fires up an action on a target of your desire.

read all about it in the docs... :D

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