ios - 点击作为 UIView subview 的 UIButton

Question

我在捕获 UIButton 上的点击时遇到问题，该 UIButton 是 UIView 的 subview 。以下是我的代码的设置方式:

// in MyClass.m
@interface MyClass ()
@property (nonatomic, retain) UIButton *myButton;
@end

@implementation MyClass
@synthesize myButton;

- (void) buttonTapped:(id) sender {
    NSLog(@"button tapped!");
}

- (id) initWithFrame:(CGRect)frame {
    if (!(self = [super initWithFrame:CGRectZero]))
        return nil;

    myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    [myButton setImage:[UIImage imageNamed:@"image.png"] 
                                  forState:UIControlStateNormal];
    [myButton addTarget:self 
                 action:@selector(buttonTapped:)
       forControlEvents:UIControlEventTouchUpInside];
    myButton.exclusiveTouch = YES;
    myButton.frame = CGRectMake(100, 100, 100, 100);
    [self addSubview:myButton];

    return self;
}

- (void) dealloc {
    [myButton release];
    [super dealloc];
}

@end

按钮出现在 View 中。当我点击它时，按钮颜色会瞬间改变。然而，选择器 buttonTapped: 从未被调用。 知道为什么吗？

我如何验证 buttonTapped: 确实是 myButton 的目标？

Answer 1

您可以通过记录 r 来验证您当前的类是否是目标

NSLog(@"actions for target %@",[myButton actionsForTarget:self forControlEvent:UIControlEventTouchUpInside]);

但是，我将您的代码添加到测试项目(单 View 模板)并且 buttonTapped: 方法起作用了。

- (void) buttonTapped:(id) sender {
  NSLog(@"button tapped!");
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{


    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];

    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    self.viewController = [[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil] autorelease];
    self.window.rootViewController = self.viewController;
  UIButton * myButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  [myButton setImage:[UIImage imageNamed:@"image.png"] 
            forState:UIControlStateNormal];
  [myButton addTarget:self 
               action:@selector(buttonTapped:)
     forControlEvents:UIControlEventTouchUpInside];
  myButton.exclusiveTouch = YES;
  myButton.frame = CGRectMake(100, 100, 100, 100);
    [rv.view addSubview:myButton];

    return YES;
}

问题出在别处。代码是否为 MyClass 发布了整个 .h 和 .m？