ios - 无法识别的选择器导致的 NSInvalidArgumentFormatException 已发送至发件人 : while trying to print tag of a UILabel

Question

我有一个 ScrollView，它有很多数据 block 。每个 block 都有一个 UILabel。我在 for 循环中创建每个 block :

for(int i = 0 ; i < x ; i++){

        UILabel *claim = [[UILabel alloc]initWithFrame:CGRectMake(40,135, self.view.bounds.size.width, 30)];
        claim.text = @"claim";
        [claim setTag:i];
        NSLog(@"%ld",claim.tag);
        claim.font = [UIFont fontWithName:@"Arial" size:(20.0)];
        [claim setTextColor:[UIColor purpleColor]];

        //create a tab recogniser for claim text
        UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]
                                       initWithTarget:self
                                               action:@selector(claimClicked:)];
        [claim setUserInteractionEnabled:YES];
        [claim addGestureRecognizer:tap];
        [scrollView addSubView :claim];
}
[self.view addSubView : scrollView];

声明标签的选择器是:

- (IBAction)claimClicked:(UILabel *)sender{
    NSInteger the_tag = ((UIView*)sender).tag;
    NSLog(@"%ld",the_tag);
}

基本上我只是在点击标签时打印标签。但我得到一个异常(exception)说:

NSInvalidArgumentFormatException caused by unrecognized selector was sent to sender 在 NSlog 行上。

帮助。

Answer 1

实际上这里的发送者是UITapGestureRecognizer。

改用代码:

- (IBAction)claimClicked:(UIGestureRecognizer *)sender
{
    NSLog(@"%d",sender.view.tag);
}