UITapGestureRecognizer 的用法(輕觸手勢識別器)

最近在項目中用到了手勢操作，鍵盤迴收時還是挺常用的，現在總結下，多謝網路上大神們的分享。

先分享下我在項目中用的代碼：

UITapGestureRecognizer * mytap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap_gestureRecognizer:)];
[self addGestureRecognizer:mytap];
[mytap release];

//收回鍵盤
-(void)tap_gestureRecognizer:(UITapGestureRecognizer *)tap_gest
{
    [self.scv_stockPriceTextField resignFirstResponder];
    [self.scv_stockAmoutTextField resignFirstResponder];
}

//單指單擊
 UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self
 action:@selector(handleSingleFingerEvent:)];
 singleFingerOne.numberOfTouchesRequired = 1; //手指數
 singleFingerOne.numberOfTapsRequired = 1; //tap次數
 singleFingerOne.delegate = self;
 //單指雙擊
 UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self
 action:@selector(handleSingleFingerEvent:)];
 singleFingerTwo.numberOfTouchesRequired = 1;
 singleFingerTwo.numberOfTapsRequired = 2;
 singleFingerTwo.delegate = self;
 //雙指單擊
 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;
 //如果不加下麵的話，當單指雙擊時，會先調用單指單擊中的處理，再調用單指雙擊中的處理
 [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];
 //同理雙指亦是如此
 [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];

處理事件的方法，代碼：

1: //處理單指事件
2: - (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender
3: {
4:   if (sender.numberOfTapsRequired == 1) {
5:    //單指單擊
6:    NSLog(@"單指單擊");
7:   }else if(sender.numberOfTapsRequired == 2){
8:    //單指雙擊
9:    NSLog(@"單指雙擊");
10:  }
11: }
12: //處理雙指事件
13: - (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender
14: {
15: if (sender.numberOfTapsRequired == 1) {
16: //雙指單擊
17: NSLog(@"雙指單擊");
18: }else if(sender.numberOfTapsRequired == 2){
19: //雙指雙擊
20: NSLog(@"雙指雙擊");
21: }
22: }

將相應代碼複製到你的工程中即可使用，由於代碼中已經有詳細的解釋說明，這裡就不在重覆解釋了。

代碼中只是列舉了單指與雙指對於單擊或多擊的處理，同理多指的操作需修改numberOfTouchesRequired屬性，對點擊的次數需修改numberOfTapsRequired屬性。

對於其他手勢例如UISwipeGestureRecognizer，UILongPressGestureRecognizer,UILongPressGestureRecognizer 的操作使用類似處理。

UIKit中包含了UIGestureRecognizer類，用於檢測發生在設備中的手勢。UIGestureRecognizer是一個抽象類，定義了所有手勢的基本行為，它有下麵一些子類用於處理具體的手勢： 

    1、拍擊UITapGestureRecognizer (任意次數的拍擊)  
    2、向里或向外捏UIPinchGestureRecognizer (用於縮放)  
    3、搖動或者拖拽UIPanGestureRecognizer  
    4、擦碰UISwipeGestureRecognizer (以任意方向)  
    5、旋轉UIRotationGestureRecognizer (手指朝相反方向移動)  
    6、長按UILongPressGestureRecognizer 

對於不同類型的手勢識別器，具有不同的配置屬性。比如UITapGestureRecognizer，可以配置拍擊次數。界面接收到手勢之後，可以發送一 個消息，用於處理響應手勢動作後的任務。當然，不同的手勢識別器，發送的消息方法也會有所不同。