iOS7:UITapGestureRecognizer重用问题 [英] iOS7: UITapGestureRecognizer reuse issue

问题描述

我设置了三个按钮.每个按钮都标记有1 ... 3.

I set three buttons. Every button is tagged 1...3.

我的UITapGestureRecognizer只能运行一次，并且只能用于第一个UIButton.无法选择其他两个选项.代码:

My UITapGestureRecognizer works only once and only for first UIButton. Can't select other two options. Code:

- (void)viewDidLoad
{
    [super viewDidLoad];

    UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(buttonTapped:)];
    recognizer.delegate = self;
    recognizer.cancelsTouchesInView = NO;
    [recognizer setNumberOfTapsRequired:1];
    [_btnNegative addGestureRecognizer:recognizer];
    [_btnNeutral addGestureRecognizer:recognizer];
    [_btnPositive addGestureRecognizer:recognizer];
}

和 buttonTapped:方法:

-(void)buttonTapped:(UITapGestureRecognizer *)recognizer
{
    switch (((UIGestureRecognizer *)recognizer).view.tag)
    {
         case 1:
        {
            NSLog(@"Positive");
            [_btnPositive setBackgroundImage:[UIImage imageNamed:@"checkedBox"] forState:UIControlStateNormal];
            [_btnNegative setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            [_btnNeutral setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            _opinion=@"Positive";
            break;
        }
        case 2:
        {
            NSLog(@"Negative");
            [_btnNegative setBackgroundImage:[UIImage imageNamed:@"checkedBox"] forState:UIControlStateNormal];
            [_btnPositive setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            [_btnNeutral setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            _opinion=@"Negative";
            break;
        }
        case 3:
        {
            NSLog(@"Neutral");
            [_btnNeutral setBackgroundImage:[UIImage imageNamed:@"checkedBox"] forState:UIControlStateNormal];
            [_btnNegative setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            [_btnPositive setBackgroundImage:[UIImage imageNamed:@"UncheckedBox"] forState:UIControlStateNormal];
            _opinion=@"Neutral";
            break;
        }
    }
}

仅 case:1 有效.其他情况永远都不会得到解决.我重新检查了按钮标签，一切正常1 ... 3.非常感谢您的帮助.

Only case:1 works. Other cases never get called. I rechecked the button tags and are ok 1...3. Your help is much appreciated.

推荐答案

我遇到了同样的问题尝试为每个按钮分配一个新的UITapGestureRecognizer:

I had the same problem Try to assign a new UITapGestureRecognizer to each button:

 UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self      action:@selector(buttonTapped:)];
recognizer.delegate = self;
recognizer.cancelsTouchesInView = NO;
[recognizer setNumberOfTapsRequired:1];
[_btnNegative addGestureRecognizer:recognizer];

 recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self      action:@selector(buttonTapped:)];
[_btnNeutral addGestureRecognizer:recognizer];

 recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self      action:@selector(buttonTapped:)];
[_btnPositive addGestureRecognizer:recognizer];

这篇关于iOS7:UITapGestureRecognizer重用问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！