objective-c - [UITapGestureRecognizer 标签] : unrecognized selector sent to instance

Question

我正在安排一系列 imageview，并为其分配一个 TapView 识别器

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self action:@selector(action:)];
[tapRecognizer setNumberOfTouchesRequired:1];
[tapRecognizer setDelegate:self];
imageView.userInteractionEnabled = YES;
[imageView addGestureRecognizer:tapRecognizer];

并且我将选择器定义为:

-(void) action:(id)sender
  {
    NSLog(@"TESTING TAP");
    NSLog (@"%d",[sender tag]);
  }

这正在崩溃，我收到的错误消息是:-

[UITapGestureRecognizer 标签]:无法识别的选择器发送到实例 0x145d0210

Answer 1

你可以用这个..

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc]
                                         initWithTarget:self action:@selector(action:)];
[tapRecognizer setNumberOfTouchesRequired:1];
[tapRecognizer setDelegate:self];
imageView.userInteractionEnabled = YES;
imageView.tag = 1111;
[imageView addGestureRecognizer:tapRecognizer];

并在行动中尝试这个..

-(void) action:(id)sender
  {
    NSLog(@"TESTING TAP");
    UITapGestureRecognizer *tapRecognizer = (UITapGestureRecognizer *)sender;
    NSLog (@"%d",[tapRecognizer.view tag]);
  }

解释:

UITapGestureRecognizer 没有像 tag 这样的属性。但是它有属性 view，从这个属性你可以访问附加了 UITapGestureRecognizer 的 View 。

希望对你有帮助