UIImageView響應點擊事件

1. C代碼   

   1. UIImageView *imageView = [self getYourImageView];  
   2. imageView.image = [self getYourImage];  
   3. imageView.userInteractionEnabled = YES;  
   4. UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(yourHandlingCode:)];  
   5. [imageView addGestureRecognizer:singleTap];  
   6. [singleTap release];  
    UITapGestureRecognizer 的用法

Java代碼   

1. //單指單擊  
2. UITapGestureRecognizer *singleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self  
3.  action:@selector(handleSingleFingerEvent:)];  
4.  singleFingerOne.numberOfTouchesRequired = 1; //手指數  
5.  singleFingerOne.numberOfTapsRequired = 1; //tap次數  
6.  singleFingerOne.delegate = self;  
7.   
8.  //單指雙擊  
9.  UITapGestureRecognizer *singleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self  
10.  action:@selector(handleSingleFingerEvent:)];  
11.  singleFingerTwo.numberOfTouchesRequired = 1;  
12.  singleFingerTwo.numberOfTapsRequired = 2;  
13.  singleFingerTwo.delegate = self;  
14.  //雙指單擊  
15. UITapGestureRecognizer *doubleFingerOne = [[UITapGestureRecognizer alloc] initWithTarget:self  
16. action:@selector(handleDoubleFingerEvent:)];  
17.  doubleFingerOne.numberOfTouchesRequired = 2;  
18.  doubleFingerOne.numberOfTapsRequired = 1;  
19. doubleFingerOne.delegate = self;  
20. UITapGestureRecognizer *doubleFingerTwo = [[UITapGestureRecognizer alloc] initWithTarget:self  
21.                      action:@selector(handleDoubleFingerEvent:)];  
22.  doubleFingerTwo.numberOfTouchesRequired = 2;  
23.  doubleFingerTwo.numberOfTapsRequired = 2;  
24.  doubleFingerTwo.delegate = self;  
25. //若是不加下面的話，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  
26. [singleFingerOne requireGestureRecognizerToFail:singleFingerTwo];  
27.  //同理雙指亦是如此  
28.  [doubleFingerOne requireGestureRecognizerToFail:doubleFingerTwo];  
29.  [self.view addGestureRecognizer:singleFingerOne];  
30. [self.view addGestureRecognizer:singleFingerTwo];  
31. [self.view addGestureRecognizer:doubleFingerOne];  
32.  [self.view addGestureRecognizer:doubleFingerTwo];  
33.  [singleFingerOne release];  
34.  [singleFingerTwo release];  
35. [doubleFingerOne release];  
36.  [doubleFingerTwo release];  
37. 處理事件的方法，代碼：  
38. //處理單指事件  
39.  - (void)handleSingleFingerEvent:(UITapGestureRecognizer *)sender  
40. {  
41. if (sender.numberOfTapsRequired == 1) {  
42.  //單指單擊  
43.  NSLog(@"單指單擊");  
44. }else if(sender.numberOfTapsRequired == 2){  
45.  //單指雙擊  
46. NSLog(@"單指雙擊");  
47. }  
48.  }  
49.  //處理雙指事件  
50.  - (void)handleDoubleFingerEvent:(UITapGestureRecognizer *)sender  
51. {  
52.  if (sender.numberOfTapsRequired == 1) {  
53.  //雙指單擊  
54. NSLog(@"雙指單擊");  
55. }else if(sender.numberOfTapsRequired == 2){  
56. //雙指雙擊  
57.  NSLog(@"雙指雙擊");  
58. }  
59. }  

  下面這個比較全一下：

Java代碼   

1. 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，定義了全部手勢的基本行爲，它有下面一些子類用於處理具體的手勢：   
2.   
3.     1、拍擊UITapGestureRecognizer (任意次數的拍擊)    
4.   
5.     2、向裏或向外捏UIPinchGestureRecognizer (用於縮放)    
6.   
7.     3、搖動或者拖拽UIPanGestureRecognizer    
8.   
9.     4、擦碰UISwipeGestureRecognizer (以任意方向)    
10.   
11.     5、旋轉UIRotationGestureRecognizer (手指朝相反方向移動)    
12.   
13.     6、長按UILongPressGestureRecognizer   
14.   
15. 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：   
16.   
17.    
18.   
19. 一個手指，拍擊兩次手勢  
20.   
21. // 建立一個手勢識別器  
22.   
23. UITapGestureRecognizer *oneFingerTwoTaps =  
24.   
25.   [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];  
26.   
27. // Set required taps and number of touches  
28.   
29. [oneFingerTwoTaps setNumberOfTapsRequired:2];  
30.   
31. [oneFingerTwoTaps setNumberOfTouchesRequired:1];  
32.   
33. // Add the gesture to the view  
34.   
35. [[self view] addGestureRecognizer:oneFingerTwoTaps];  
36.   
37. 消息方法oneFingerTwoTaps  
38.   
39. - (void)oneFingerTwoTaps  
40.   
41. {  
42.   
43.   NSLog(@"Action: One finger, two taps");  
44.   
45. }  
46.   
47. 兩個手指，拍擊兩次手勢  
48.   
49.     UITapGestureRecognizer *twoFingersTwoTaps =  
50.   
51.       [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];  
52.   
53.     [twoFingersTwoTaps setNumberOfTapsRequired:2];  
54.   
55.     [twoFingersTwoTaps setNumberOfTouchesRequired:2];  
56.   
57.     [[self view] addGestureRecognizer:twoFingersTwoTaps];  
58.   
59. 消息方法twoFingersTwoTaps  
60.   
61.     - (void)twoFingersTwoTaps {  
62.   
63.       NSLog(@"Action: Two fingers, two taps");  
64.   
65.     }  
66.   
67.    
68.   
69. 一個手指向上、向下擦碰手勢  
70.   
71. // 向上擦碰  
72.   
73.     UISwipeGestureRecognizer *oneFingerSwipeUp =  
74.   
75.       [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];  
76.   
77.     [oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];  
78.   
79.     [[self view] addGestureRecognizer:oneFingerSwipeUp];  
80.   
81.        
82.   
83.     - (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer  
84.   
85.     {  
86.   
87.       CGPoint point = [recognizer locationInView:[self view]];  
88.   
89.       NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);  
90.   
91.     }  
92.   
93.     // 向下擦碰  
94.   
95.     UISwipeGestureRecognizer *oneFingerSwipeDown =  
96.   
97.       [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];  
98.   
99.     [oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];  
100.   
101.     [[self view] addGestureRecognizer:oneFingerSwipeDown];  
102.   
103.        
104.   
105.     - (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer  
106.   
107.     {  
108.   
109.       CGPoint point = [recognizer locationInView:[self view]];  
110.   
111.       NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);  
112.   
113.     }  
114.   
115.  旋轉手勢  
116.   
117. UIRotationGestureRecognizer *twoFingersRotate =  
118.   
119.   [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];  
120.   
121. [[self view] addGestureRecognizer:twoFingersRotate];  
122.   
123.    
124.   
125. - (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer  
126.   
127. {  
128.   
129.   // Convert the radian value to show the degree of rotation  
130.   
131.   NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));  
132.   
133. }  
134.   
135. 向裏或向外捏的手勢  
136.   
137. UIPinchGestureRecognizer *twoFingerPinch =  
138.   
139.   [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];  
140.   
141. [[self view] addGestureRecognizer:twoFingerPinch];  
142.   
143.    
144.   
145. - (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer  
146.   
147. {  
148.   
149.   NSLog(@"Pinch scale: %f", recognizer.scale);  
150.   
151. }