手势处理

在ios开发中，需用到对于手指的不同操作，以手指点击为例：分为单指单击、单指多击、多指单击、多指多击。对于这些事件进行不同的操作处理，由于使用系统自带的方法通过判断touches不太容易处理，而且会有事件之间的冲突。

 

接下来，通过以UITapGestureRecognizer 手势实现此功能需求 代码如下：

ViewController.m中的viewDidLoad方法：

//单指单击
    UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
                                    action:@selector(handleSingleFingerEvent:)];
    singleFingerOne.numberOfTouchesRequired = 1; //手指数
    singleFingerOne.numberOfTapsRequired = 1; //tap次数
    singleFingerOne.delegate = self;

    //单指双击
    UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
                                     action:@selector(handleSingleFingerEvent:)];
    singleFingerTwo.numberOfTouchesRequired = 1;
    singleFingerTwo.numberOfTapsRequired = 2;
    singleFingerTwo.delegate = self;

    //双指单击
    UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
                                     action:@selector(handleDoubleFingerEvent:)];
    doubleFingerOne.numberOfTouchesRequired = 2;
    doubleFingerOne.numberOfTapsRequired = 1;
    doubleFingerOne.delegate = self;

    UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
   action:@selector(handleDoubleFingerEvent:)];
    doubleFingerTwo.numberOfTouchesRequired = 2;
    doubleFingerTwo.numberOfTapsRequired = 2;
    doubleFingerTwo.delegate = self;

    //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
    [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];
    //同理双指亦是如此
    [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];

    [self.view addGestureRecognizer:singleFingerOne];
    [self.view addGestureRecognizer:singleFingerTwo];
    [self.view addGestureRecognizer:doubleFingerOne];
    [self.view addGestureRecognizer:doubleFingerTwo];

    [singleFingerOne release];
    [singleFingerTwo release];
    [doubleFingerOne release];
    [doubleFingerTwo release];

处理事件的方法，代码：

//处理单指事件
- (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender
{
    if (sender.numberOfTapsRequired == 1) {
        //单指单击
        NSLog(@"单指单击");
    }else if(sender.numberOfTapsRequired == 2){
        //单指双击
        NSLog(@"单指双击");
    }
}
//处理双指事件
- (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender
{
    if (sender.numberOfTapsRequired == 1) {
        //双指单击
        NSLog(@"双指单击");
    }else if(sender.numberOfTapsRequired == 2){
        //双指双击
        NSLog(@"双指双击");
    }
}

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。