我设置了三个按钮。每个按钮都标记为 1...3。
我的 UITapGestureRecognizer 只对第一个 UIButton 起作用一次。无法选择其他两个选项。 代码:
- (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];
}
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;
}
}
}
只有 case:1
有效。其他情况永远不会被调用。我重新检查了按钮标签,没问题 1...3。非常感谢您的帮助。
最佳答案
不,您不能重复使用相同的手势识别器。手势识别器被设计为附加到一个且仅一个 View 。
关于iOS7 : UITapGestureRecognizer reuse issue,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24245814/