是否可以将UITapGestureRecognizer附加到UILabel子类 [英] Is it possible to attach UITapGestureRecognizer to UILabel subclass

问题描述

我正在尝试将手势识别器附加到我自己的类，这是UILabel的子类，但它不起作用。你能帮我理解代码中的错误吗？

I'm trying to attach gesture recognizer to my own class which is subclass of UILabel, but it does not work. Can you help me to understand what's wrong in the code

 
@interface Card : UILabel  {

}

- (void) addBackSideWord;

@end

#import "Card.h"

@implementation Card
- (id)initWithFrame:(CGRect)frame {

    if ((self = [super initWithFrame:frame])) {

        UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
                         initWithTarget:self action:@selector(addBackSideWord)];
        [tapRecognizer setNumberOfTouchesRequired:2];
        [tapRecognizer setDelegate:self];
        [self addGestureRecognizer:tapRecognizer];
    }

    return self;
}

- (void) addBackSideWord {

     //do something
}
@end

推荐答案

您的代码应该可以正常工作，您可能需要解决的唯一问题是默认情况下，UILabel禁用了用户交互，因此手势识别器不会收到任何触摸事件。尝试通过在代码中添加此行来手动启用它（例如在init方法中）：

Your code should work fine, the only thing you may need to fix is that user interaction is disabled for UILabel by default, so gesture recogniser does not receive any touch events. Try manually enable it by adding this line to your code (e.g. in init method):

self.userInteractionEnabled = YES;

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