具有自定义视图的右导航栏按钮不会触发动作

Question

我试图创建一个正确的栏按钮，但触摸按钮时不会触发该动作。有任何想法吗？

button = [[UIBarButtonItem alloc] initWithCustomView:[[UIImageView alloc] initWithImage:image]]; 
button.action = @selector(myaction); 
button.target = self; 
self.navigationItem.rightBarButtonItem = button; 
[button release]; 

Answer 1

不幸的是，您无法触发使用自定义视图创建的UIBarButtonItem上的操作。如果您的自定义视图实际上是UIControl或响应触摸事件的其他内容，则此工作的唯一方法。

如果您需要支持3.2之前的版本，处理这个问题的最佳方法是创建一个按钮而不是图像视图，并在该按钮上设置操作。如果你能逃脱支持3.2+，你可以再补充一个UIGestureRecognizer到您的视图（顺便说一句：在你的代码，你的图像视图漏水，请参阅下面的正确使用）：

// This works for iOS 3.2+ 
UIImageView imageView = [[UIImageView alloc] initWithImage:image]; 

// Add the gesture recognizer for the target/action directly to the image view 
// Note that the action should take a single argument, which is a reference to 
// the gesture recognizer. To be compatible with actions, you can just declare 
// this as (id)sender, especially if you don't use it. So the prototype for your 
// action method should be: -(void)myAction:(id)sender or -(void)myAction:(UIGestureRecognizer*)gestureRecognizer 
UITapGestureRecognizer tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(myAction:)]; 
[imageView setUserInteractionEnabled:YES]; 
[imageView addGestureRecognizer:tapRecognizer]; 
[tapRecognizer release]; 

// Proceed with configuring the bar button item 
UIBarButtonItem button = [[UIBarButtonItem alloc] initWithCustomView:imageView]; 
[[self navigationItem] setRightBarButtonItem:button]; 
[button release]; 
[imageView release]; // you were leaking this 

现在将工作如预期的那样，不需要在那里隐藏UIButton那里，你可能不想...