Ios 为什么'；我的动作没有响应选择器吗？

我对UILabel进行了子类化，并添加了两个如下所示的属性：

@property (nonatomic, assign) SEL action;
@property (nonatomic, assign) id target;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    if ([target respondsToSelector:@selector(action)]) {
        [target performSelector:@selector(action) onThread:[NSThread mainThread] withObject:nil waitUntilDone:NO];
    }
}

    label.target = self;
    labek.action = @selector(myMethod);
    label.userInteractionEnabled = YES;

然后我实现了UIView的方法，如下所示：

@property (nonatomic, assign) SEL action;
@property (nonatomic, assign) id target;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    if ([target respondsToSelector:@selector(action)]) {
        [target performSelector:@selector(action) onThread:[NSThread mainThread] withObject:nil waitUntilDone:NO];
    }
}

    label.target = self;
    labek.action = @selector(myMethod);
    label.userInteractionEnabled = YES;

在包含子类UILabel的类中，我将目标和操作设置为：

@property (nonatomic, assign) SEL action;
@property (nonatomic, assign) id target;

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{

    if ([target respondsToSelector:@selector(action)]) {
        [target performSelector:@selector(action) onThread:[NSThread mainThread] withObject:nil waitUntilDone:NO];
    }
}

    label.target = self;
    labek.action = @selector(myMethod);
    label.userInteractionEnabled = YES;

包含标签的类确实有方法myMethod，因此它应该响应它。你知道为什么不会吗

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谢谢

调试控制台中是否有错误

怎么样

@selector(myMethod:) // with colon.

---

确保标签包含在superview的边界中

您正在这样设置操作

label.action=@selector（myMethod）

然后使用action并将其传递到第二个选择器

[目标响应选择器：@selector（action）]

。那是行不通的

您要执行以下操作：

if ([target respondsToSelector:self.action]) {
    [target performSelector:self.action onThread:[NSThread mainThread] withObject:nil waitUntilDone:NO];
}

基本上，if语句失败是因为目标不响应该选择器。因此，它永远不会被调用