objective-c – iOS – 双击uibutton

发布时间：2020-12-14 20:04:59 所属栏目：百科来源：网络整理

导读：我有一个按钮,我正在测试它的水龙头,一点点它改变背景颜色,两个水龙头的另一种颜色和三个水龙头再次的颜色. 代码是： - (IBAction) button {UITapGestureRecognizer *tapOnce = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOn

我有一个按钮,我正在测试它的水龙头,一点点它改变背景颜色,两个水龙头的另一种颜色和三个水龙头再次的颜色.
代码是：

- (IBAction) button {
UITapGestureRecognizer *tapOnce = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapOnce:)];
UITapGestureRecognizer *tapTwice = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapTwice:)];
UITapGestureRecognizer *tapTrice = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapTrice:)];

tapOnce.numberOfTapsRequired = 1;
tapTwice.numberOfTapsRequired = 2;
tapTrice.numberOfTapsRequired = 3;
//stops tapOnce from overriding tapTwice
[tapOnce requireGestureRecognizerToFail:tapTwice];
[tapTwice requireGestureRecognizerToFail:tapTrice];

//then need to add the gesture recogniser to a view - this will be the view that recognises the gesture
[self.view addGestureRecognizer:tapOnce];
[self.view addGestureRecognizer:tapTwice];
[self.view addGestureRecognizer:tapTrice];
}

- (void)tapOnce:(UIGestureRecognizer *)gesture
 { self.view.backgroundColor = [UIColor redColor]; }

- (void)tapTwice:(UIGestureRecognizer *)gesture
 {self.view.backgroundColor = [UIColor blackColor];}

- (void)tapTrice:(UIGestureRecognizer *)gesture
 {self.view.backgroundColor = [UIColor yellowColor]; }

问题是,第一个水龙头不工作,另一个是.
如果我使用这个代码没有按钮,它的工作完美.
谢谢.

解决方法

如果您想要点击按钮更改颜色,您应该在viewDidLoad方法中添加这些手势,而不是按照相同的按钮操作.上面的代码将重复添加手势点击按钮到self.view而不是按钮.

- (void)viewDidLoad {
      [super viewDidLoad];
      UITapGestureRecognizer *tapOnce = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapOnce:)];
      UITapGestureRecognizer *tapTwice = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapTwice:)];
      UITapGestureRecognizer *tapTrice = [[UITapGestureRecognizer alloc] initWithTarget:self  action:@selector(tapTrice:)];

      tapOnce.numberOfTapsRequired = 1;
      tapTwice.numberOfTapsRequired = 2;
      tapTrice.numberOfTapsRequired = 3;
      //stops tapOnce from overriding tapTwice
      [tapOnce requireGestureRecognizerToFail:tapTwice];
      [tapTwice requireGestureRecognizerToFail:tapTrice];

      //then need to add the gesture recogniser to a view - this will be the view that recognises the gesture
      [self.button addGestureRecognizer:tapOnce]; //remove the other button action which calls method `button`
      [self.button addGestureRecognizer:tapTwice];
      [self.button addGestureRecognizer:tapTrice];
}

（编辑：李大同）

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