Question

我已经创建了一个标签并在其上设置了点击手势，但是当我点击它时它会显示错误。

我的代码是.h文件

@interface ViewController : UIViewController
{
    UILabel *alabel;
}
@property (strong, nonatomic) UILabel *alabel;

<。>文件中的

- (void)viewDidLoad
{
    [super viewDidLoad];

    alabel = [[UILabel alloc] initWithFrame:CGRectMake(10, 10, 100, 50)];
    alabel.text = @"Drag me!";

    alabel.userInteractionEnabled = YES;

    UITapGestureRecognizer *tapGesture =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap)];
    [alabel addGestureRecognizer:tapGesture];

    [self.view addSubview:alabel];
}

- (void)labelTap:(UITapGestureRecognizer *)tapGesture {
    TouchLabelViewController *touchLabelViewController = [[TouchLabelViewController alloc] initWithNibName:@"TouchLabelViewController" bundle:[NSBundle mainBundle]];
    [self presentModalViewController:touchLabelViewController animated:NO];
    }

日志显示

2012-10-29 11:19:17.313 DragableControll[795:f803] -[ViewController labelTap]: unrecognized selector sent to instance 0x68956b0
2012-10-29 11:19:17.316 DragableControll[795:f803] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[ViewController labelTap]: unrecognized selector sent to instance 0x68956b0'

Answer 1

查看您的代码，您错误地将选择器添加到Tap手势

  UITapGestureRecognizer *tapGesture =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap)];

你应该这样做

   UITapGestureRecognizer *tapGesture =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap:)];

Answer 2

你的selector没有正确添加。你忘了带参数的选择器方法需要提供：最后ie（labelTap :)

编辑：用我的

替换你的行

UITapGestureRecognizer *tapGesture =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap:)];

在.h文件中注册UIGestureDelegate

Answer 3

替换以下代码

UITapGestureRecognizer *tapGesture =[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap:)];

注意：添加Colon Near labelTab即（labelTap :)

Answer 4

在此更改代码

TapGestureRecognizer alloc] initWithTarget:self action:@selector(labelTap:)];

你选择了（labeltap），但它应该是（labeltap :)

Tapgesture不起作用

4 个答案: