是否可以将UITapGestureRecognizer附加到UILabel子类

Question

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？

 
@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

Answer 1

您的代码应该可以正常工作,您可能需要修复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):

self.userInteractionEnabled = YES;

Answer 2

是的,这是可能的,任何继承自的类UIView.

不要忘记启用用户交互.

self.userInteractionEnabled = YES;