如何在UIImageview中添加手势识别器？ [英] How to add gesture recognizer to a UIImageview?

问题描述

在项目中，有一个 UIView myView和一个 UIImageView myImage支持myView，视图层次结构：

In the project, there are an UIView myView and an UIImageView myImage behinds the myView, views hierarchy:

UIWindow

| - UIImageView（myImage）

| - UIView（myView）[全屏]

UIWindow
|-- UIImageView (myImage)
|-- UIView (myView) [whole screen]

然后在ViewController中为myImage添加了手势识别器

Then added a gesture recognizer to myImage in ViewController

UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
        tapGesture.numberOfTapsRequired = 1;
        [myImage addGestureRecognizer:tapGesture];

但是手势不影响myImage，myImage有 setUserInteractionEnabled：YES 。它只会影响myImage放在myView前面的时候，我该如何解决这个问题？

But gesture doesn't affect myImage, myImage has setUserInteractionEnabled:YES. It will only affect when myImage placed in front of myView, how can I solve this problem?

推荐答案

你的 UIView 显然可以在触及 UIImageView 之前拦截触摸。

Your UIView obviously intercept the touches before they can reach the UIImageView.

你可以要么将 UIImageView 放在 UIView 前面，要么禁用 UIView <上的用户互动/ code>因此它不会拦截触摸。

You can either put your UIImageView in front of your UIView, or disable user interaction on the UIView so it does not intercept the touches.

如果您需要更精细的抓住触摸事件，您可以：

If you need finer grain over catching your touch events, you may either:



• 将 UIView 放在 UIImageView 之上如果它必须用于设计目的（例如，如果它掩盖了 UIImageView ），但使其不捕获事件（ userInteractionEnabled = NO ），并在 UIImageView 下使用不同的 UIView 来实际捕获<$ c之外的事件$ c> UIImageView


• 保持你的 UIView 在t之上他 UIImageView 并保持捕获事件（ userInteractionEnabled = YES ），但通过子类化过滤通过它的事件你的 UIView 并覆盖 pointInside：withEvent：或 hitTest：withEvent：方法。

• put your UIView on top of the UIImageView if it has to for design purposes (if it masks the UIImageView a bit for example) but make it not catch events (userInteractionEnabled = NO), and use a different UIView below the UIImageView to actually catch the events outside the UIImageView
• keep your UIView on top of the UIImageView and keep it catching events (userInteractionEnabled = YES), but filter the events that pass thru it, by subclassing your UIView and overriding either the pointInside:withEvent: or the hitTest:withEvent: method.

有关详细信息，您应该阅读与事件处理相关的专用Apple编程指南 。

For more information you should really read the dedicated Apple Programming Guide related to Event Handling.

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