手勢識別 ios

 1 /**
 2  UIKit中包含了UIGestureRecognizer類，用於檢測發生在設備中手勢。
 3  UIGestureRecognizer是一個抽象類，定義了全部手勢的基本行爲，他有下面一些子類用於處理具體的手勢：
 4  1.拍擊UITapGestureRecognizer(任意次數的拍擊)
 5  2.向裏或向外捏 UIPinchGestureRecognizer(用於縮放)
 6  3.搖動或者拖拽 UIPanGestureRecognizer
 7  4.滑動 UISwipeGestureRecoginzer(以任意方向)
 8  5.旋轉 UIRotationGestureRecoginzer (手指朝相反方向移動)
 9  6.長按 UILongPressGestureRecoginzer
10  
11  對於不一樣類型的手勢識別器，具備不一樣的配置屬性。好比UITapGestureRecognizer，能夠配置拍擊次數。界面接收到手勢以後，能夠發送一 個消息，用於處理響應手勢動做後的任務。固然，不一樣的手勢識別器，發送的消息方法也會有所不一樣。下面列舉幾個具體示例代碼：
12  */
13 
14 
15 #pragma mark 一個手指，拍擊兩次手勢
16 -(void)test1{
17     UITapGestureRecognizer *oneFingerTwoTaps =  [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(oneFingerTwoTaps)];
18     // Set required taps and number of touches
19     //敲擊次數 隨意設，不過通常狀況都是很少於2此
20     [oneFingerTwoTaps setNumberOfTapsRequired:2];
21     //敲擊手指數 隨意設，不過要考慮用戶使用
22     [oneFingerTwoTaps setNumberOfTouchesRequired:1];
23     
24     // Add the gesture to the view
25     //添加到View
26     [self.view addGestureRecognizer:oneFingerTwoTaps];
27 }
28 //消息方法
29 -(void)oneFingerTwoTaps
30 {
31     NSLog(@"敲擊了。。。");
32 }
33 
34 #pragma mark 一個手指滑動手勢
35 -(void)test2
36 {
37     UISwipeGestureRecognizer *oneFingerSwipeUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(oneFingerSwipeUp:)];
38     
39     
40     //滑動方向<#(UISwipeGestureRecognizerDirection)#>枚舉類型
41     /*
42      UISwipeGestureRecognizerDirectionRight = 1 << 0,
43      UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
44      UISwipeGestureRecognizerDirectionUp    = 1 << 2,
45      UISwipeGestureRecognizerDirectionDown  = 1 << 3
46      */
47     [oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp ];
48     [self.view addGestureRecognizer:oneFingerSwipeUp];
49 }
50 //消息方法
51 -(void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
52 {
53     CGPoint point = [recognizer locationInView:self.view];
54    NSLog(@"上滑 - start location: %f,%f", point.x, point.y);
55 }
56 
57 #pragma mark 旋轉手勢
58 -(void)test3
59 {
60     UIRotationGestureRecognizer *twoFingersRoatate = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(twoFingersRotate:)];
61     [self.view addGestureRecognizer:twoFingersRoatate];
62     
63 }
64 -(void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
65 {
66     NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
67 }