如何通过-addSublayer添加UI元素：响应触摸事件？ [英] How can I make a UI element added via -addSublayer: respond to touch events?

问题描述

以下是我用于通过 -addSublayer 向图层添加UIButton的代码：

The following is code that I use to add a UIButton to a layer via -addSublayer:

CAGradientLayer * tile = [[tile alloc] init];      

UIButton *XImageButton = [[UIButton alloc]init];
 XImageButton.frame= CGRectMake(kXButtonlocX, kXButtonlocY, kXButtonHeight,kXButtonWidth );

[XImageButton setTitle:@"xbutton" forState:UIControlStateNormal];
[XImageButton addTarget:nil action:@selector(XbuttonTouchEvent)    
forControlEvents:UIControlEventTouchUpInside];

[tile addSublayer:XImageButton.layer]; 

XImageButton 事件。

推荐答案

你不能。

UIKit触摸事件转发是UIResponder的一个功能，而CALayers不会从UIResponder继承，所以除非你

UIKit touch event forwarding is a feature of UIResponder, and CALayers don't inherit from UIResponder, so unless you fancy implementing touch handling from first principles this is not the way to go.

要将渐变图层转换为视图，有两个选项：

To convert your gradient layer to a view, there are two options:

1）创建一个新的UIView子类并覆盖它的 +（Class）layerClass 方法返回CAGradientLayer。

1) Create a new UIView subclass and override its +(Class)layerClass method to return CAGradientLayer.

2）创建一个常规的UIView并添加您的CAGradientLayer作为子图层，然后添加您的按钮作为视图的子视图，而不是直接添加到CAGradientLayer。

2) Create a regular UIView and add your CAGradientLayer as a sublayer, then add your button as a subview of the view instead of adding it to the CAGradientLayer directly.

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