iOS学习笔记18—UITapGestureRecognizer 的用法

/单指单击

 2:     UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self 

 3:                                     action:@selector(handleSingleFingerEvent:)];

 4:     singleFingerOne.numberOfTouchesRequired = 1; //手指数

 5:     singleFingerOne.numberOfTapsRequired = 1; //tap次数

 6:     singleFingerOne.delegate = self;

 7:     

 8:     //单指双击

 9:     UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self 

 10:                                      action:@selector(handleSingleFingerEvent:)];

 11:     singleFingerTwo.numberOfTouchesRequired = 1;

 12:     singleFingerTwo.numberOfTapsRequired = 2;

 13:     singleFingerTwo.delegate = self;

 14:     

 15:     //双指单击

 16:     UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self 

 17:                                      action:@selector(handleDoubleFingerEvent:)];

 18:     doubleFingerOne.numberOfTouchesRequired = 2;

 19:     doubleFingerOne.numberOfTapsRequired = 1;

 20:     doubleFingerOne.delegate = self;

 21:     

 22:     UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self 

 23:    action:@selector(handleDoubleFingerEvent:)];

 24:     doubleFingerTwo.numberOfTouchesRequired = 2;

 25:     doubleFingerTwo.numberOfTapsRequired = 2;

 26:     doubleFingerTwo.delegate = self;

 27:     

 28:     //如果不加下面的话，当单指双击时，会先调用单指单击中的处理，再调用单指双击中的处理

 29:     [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];

 30:     //同理双指亦是如此

 31:     [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

 32:     

 33:     [self.view addGestureRecognizer:singleFingerOne];

 34:     [self.view addGestureRecognizer:singleFingerTwo];

 35:     [self.view addGestureRecognizer:doubleFingerOne];

 36:     [self.view addGestureRecognizer:doubleFingerTwo];

 37:     

 38:     [singleFingerOne release];

 39:     [singleFingerTwo release];

 40:     [doubleFingerOne release];

 41:     [doubleFingerTwo release];

处理事件的方法，代码：

 1: //处理单指事件

 2: - (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender

 3: {

 4:     if (sender.numberOfTapsRequired == 1) {

 5:         //单指单击

 6:         NSLog(@"单指单击");

 7:     }else if(sender.numberOfTapsRequired == 2){

 8:         //单指双击

 9:         NSLog(@"单指双击");

 10:     }

 11: }

 12: //处理双指事件

 13: - (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender

 14: {

 15:     if (sender.numberOfTapsRequired == 1) {

 16:         //双指单击

 17:         NSLog(@"双指单击");

 18:     }else if(sender.numberOfTapsRequired == 2){

 19:         //双指双击

 20:         NSLog(@"双指双击");

 21:     }

 22: }

将相应代码复制到你的工程中即可使用，由于代码中已经有详细的解释说明，这里就不在重复解释了。

代码中只是列举了单指与双指对于单击或多击的处理，同理多指的操作需修改numberOfTouchesRequired属性，对点击的次数需修改numberOfTapsRequired属性。

对于其他手势例如UISwipeGestureRecognizer，UILongPressGestureRecognizer,UILongPressGestureRecognizer的操作使用类似处理。