文章出處

1、UIGestureRecognizer介紹

手勢識別在iOS上非常重要，手勢操作移動設備的重要特征，極大的增加了移動設備使用便捷性。

iOS系統在3.2以后，為方便開發這使用一些常用的手勢，提供了UIGestureRecognizer類。手勢識別UIGestureRecognizer類是個抽象類，下面的子類是具體的手勢，開發這可以直接使用這些手勢識別。

UITapGestureRecognizer 

UIPinchGestureRecognizer 

UIRotationGestureRecognizer 

UISwipeGestureRecognizer 

UIPanGestureRecognizer 

UILongPressGestureRecognizer



上面的手勢對應的操作是：
  • Tap（點一下）
  • Pinch（二指往內或往外撥動，平時經常用到的縮放）
  • Rotation（旋轉）
  • Swipe（滑動，快速移動）
  • Pan （拖移，慢速移動）
  • LongPress（長按）
UIGestureRecognizer的繼承關系如下：


<ignore_js_op>1361893916_7845.png 


2、使用手勢的步驟

使用手勢很簡單，分為兩步：

  • 創建手勢實例。當創建手勢時，指定一個回調方法，當手勢開始，改變、或結束時，回調方法被調用。
  • 添加到需要識別的View中。每個手勢只對應一個View，當屏幕觸摸在View的邊界內時，如果手勢和預定的一樣，那就會回調方法。

ps：一個手勢只能對應一個View，但是一個View可以有多個手勢。

建議在真機上運行這些手勢,模擬器操作不太方便，可能導致你認為手勢失效。

3、Pan 拖動手勢：

[cpp] view plaincopyprint?

  1. UIImageView *snakeImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"snake.png"]]; 
  2. snakeImageView.frame = CGRectMake(50, 50, 100, 160); 
  3. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] 
  4. initWithTarget:self 
  5. action:@selector(handlePan:)]; 
  6. [snakeImageView addGestureRecognizer:panGestureRecognizer]; 
  7. [self.view setBackgroundColor:[UIColor whiteColor]]; 
  8. [self.view addSubview:snakeImageView]; 
  9. UIImageView *snakeImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"snake.png"]];
  10. snakeImageView.frame = CGRectMake(50, 50, 100, 160);
  11. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
  12. initWithTarget:self
  13. action:@selector(handlePan:)]; 
  14. [snakeImageView addGestureRecognizer:panGestureRecognizer];
  15. [self.view setBackgroundColor:[UIColor whiteColor]];
  16. [self.view addSubview:snakeImageView];
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新建一個ImageView，然后添加手勢

回調方法：

[cpp] view plaincopyprint?
  1. - (void) handlePan:(UIPanGestureRecognizer*) recognizer 
  2. { 
  3. CGPoint translation = [recognizer translationInView:self.view]; 
  4. recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, 
  5. recognizer.view.center.y + translation.y); 
  6. [recognizer setTranslation:CGPointZero inView:self.view]; 
  8. } 
  9. - (void) handlePan:(UIPanGestureRecognizer*) recognizer
  10. {
  11. CGPoint translation = [recognizer translationInView:self.view];
  12. recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
  13. recognizer.view.center.y + translation.y);
  14. [recognizer setTranslation:CGPointZero inView:self.view];
  16. }
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  • 4、Pinch縮放手勢
[cpp] view plaincopyprint?
  1. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] 
  2. initWithTarget:self 
  3. action:@selector(handlePinch:)];<P class="p1">[<SPAN class="s1">snakeImageView</SPAN> <SPAN class="s2">addGestureRecognizer</SPAN>:pinchGestureRecognizer];</P> 
  4. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]
  5. initWithTarget:self
  6. action:@selector(handlePinch:)];[snakeImageView addGestureRecognizer:pinchGestureRecognizer];
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[cpp] view plaincopyprint?
  1. - (void) handlePinch:(UIPinchGestureRecognizer*) recognizer 
  2. { 
  3. recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale); 
  4. recognizer.scale = 1; 
  5. } 
  6. - (void) handlePinch:(UIPinchGestureRecognizer*) recognizer
  7. {
  8. recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
  9. recognizer.scale = 1;
  10. }
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5、Rotation旋轉手勢

[cpp] view plaincopyprint?
  1. UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] 
  2. initWithTarget:self 
  3. action:@selector(handleRotate:)]; 
  4. [snakeImageView addGestureRecognizer:rotateRecognizer]; 
  5. UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc]
  6. initWithTarget:self
  7. action:@selector(handleRotate:)];
  8. [snakeImageView addGestureRecognizer:rotateRecognizer];
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[cpp] view plaincopyprint?


  1. - (void) handleRotate:(UIRotationGestureRecognizer*) recognizer 
  2. { 
  3. recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation); 
  4. recognizer.rotation = 0; 
  5. } 
  6. - (void) handleRotate:(UIRotationGestureRecognizer*) recognizer
  7. {
  8. recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
  9. recognizer.rotation = 0;
  10. }
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1361953288_8283.png 


添加了這幾個手勢后，運行看效果，程序中的imageView放了一個

/^\/^\
_|__| O|
\/ /~ \_/ \
\____|__________/ \
\_______ \
`\ \ \
| | \
/ / \
/ / \\
/ / \ \
/ / \ \
/ / _----_ \ \
/ / _-~ ~-_ | |
( ( _-~ _--_ ~-_ _/ |
\ ~-____-~ _-~ ~-_ ~-_-~ /
~-_ _-~ ~-_ _-~ 
~--______-~ ~-___-~

的圖片，在模擬器上拖動是沒問題的。縮放和旋轉有點問題，估計是因為在模擬器上的模擬的兩個接觸點距離在imageView的邊界外了，所以操作無效果。

建議在真機上運行這個手勢。

在模擬器上縮放和選擇的操作技巧：

可以把imageView的frame值設置大一點，按住alt鍵，按下觸摸板(不按下不行)，這樣就可以旋轉和縮放了。

6、添加第二個ImagView并添加手勢

記住：一個手勢只能添加到一個View，兩個View當然要有兩個手勢的實例了

[cpp] view plaincopyprint?

  1. - (void)viewDidLoad 
  2. { 
  3. [super viewDidLoad]; 
  5. UIImageView *snakeImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"snake.png"]]; 
  6. UIImageView *dragonImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"dragon.png"]]; 
  7. snakeImageView.frame = CGRectMake(120, 120, 100, 160); 
  8. dragonImageView.frame = CGRectMake(50, 50, 100, 160); 
  9. [self.view addSubview:snakeImageView]; 
  10. [self.view addSubview:dragonImageView]; 
  12. for (UIView *view in self.view.subviews) { 
  13. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc] 
  14. initWithTarget:self 
  15. action:@selector(handlePan:)]; 
  17. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc] 
  18. initWithTarget:self 
  19. action:@selector(handlePinch:)]; 
  21. UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc] 
  22. initWithTarget:self 
  23. action:@selector(handleRotate:)]; 
  25. [view addGestureRecognizer:panGestureRecognizer]; 
  26. [view addGestureRecognizer:pinchGestureRecognizer]; 
  27. [view addGestureRecognizer:rotateRecognizer]; 
  28. [view setUserInteractionEnabled:YES]; 
  29. } 
  30. [self.view setBackgroundColor:[UIColor whiteColor]]; 
  31. } 
  32. - (void)viewDidLoad
  33. {
  34. [super viewDidLoad];
  36. UIImageView *snakeImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"snake.png"]];
  37. UIImageView *dragonImageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"dragon.png"]];
  38. snakeImageView.frame = CGRectMake(120, 120, 100, 160);
  39. dragonImageView.frame = CGRectMake(50, 50, 100, 160);
  40. [self.view addSubview:snakeImageView];
  41. [self.view addSubview:dragonImageView];
  43. for (UIView *view in self.view.subviews) {
  44. UIPanGestureRecognizer *panGestureRecognizer = [[UIPanGestureRecognizer alloc]
  45. initWithTarget:self
  46. action:@selector(handlePan:)];
  48. UIPinchGestureRecognizer *pinchGestureRecognizer = [[UIPinchGestureRecognizer alloc]
  49. initWithTarget:self
  50. action:@selector(handlePinch:)];
  52. UIRotationGestureRecognizer *rotateRecognizer = [[UIRotationGestureRecognizer alloc]
  53. initWithTarget:self
  54. action:@selector(handleRotate:)];
  56. [view addGestureRecognizer:panGestureRecognizer];
  57. [view addGestureRecognizer:pinchGestureRecognizer];
  58. [view addGestureRecognizer:rotateRecognizer];
  59. [view setUserInteractionEnabled:YES];
  60. }
  61. [self.view setBackgroundColor:[UIColor whiteColor]]; 
  62. }
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多添加了一條龍的view，兩個view都能接收上面的三種手勢。運行效果如下：

<ignore_js_op>1361954419_1036.png 


7、拖動(pan手勢)速度(以較快的速度拖放后view有滑行的效果)

如何實現呢？

  • 監視手勢是否結束
  • 監視觸摸的速度
[cpp] view plaincopyprint?

  1. - (void) handlePan:(UIPanGestureRecognizer*) recognizer 
  2. { 
  3. CGPoint translation = [recognizer translationInView:self.view]; 
  4. recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x, 
  5. recognizer.view.center.y + translation.y); 
  6. [recognizer setTranslation:CGPointZero inView:self.view]; 
  8. if (recognizer.state == UIGestureRecognizerStateEnded) { 
  10. CGPoint velocity = [recognizer velocityInView:self.view]; 
  11. CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y)); 
  12. CGFloat slideMult = magnitude / 200; 
  13. NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult); 
  15. float slideFactor = 0.1 * slideMult; // Increase for more of a slide 
  16. CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor), 
  17. recognizer.view.center.y + (velocity.y * slideFactor)); 
  18. finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width); 
  19. finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height); 
  21. [UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{ 
  22. recognizer.view.center = finalPoint; 
  23. } completion:nil]; 
  25. } 
  27. - (void) handlePan:(UIPanGestureRecognizer*) recognizer
  28. {
  29. CGPoint translation = [recognizer translationInView:self.view];
  30. recognizer.view.center = CGPointMake(recognizer.view.center.x + translation.x,
  31. recognizer.view.center.y + translation.y);
  32. [recognizer setTranslation:CGPointZero inView:self.view];
  34. if (recognizer.state == UIGestureRecognizerStateEnded) {
  36. CGPoint velocity = [recognizer velocityInView:self.view];
  37. CGFloat magnitude = sqrtf((velocity.x * velocity.x) + (velocity.y * velocity.y));
  38. CGFloat slideMult = magnitude / 200;
  39. NSLog(@"magnitude: %f, slideMult: %f", magnitude, slideMult);
  41. float slideFactor = 0.1 * slideMult; // Increase for more of a slide
  42. CGPoint finalPoint = CGPointMake(recognizer.view.center.x + (velocity.x * slideFactor),
  43. recognizer.view.center.y + (velocity.y * slideFactor));
  44. finalPoint.x = MIN(MAX(finalPoint.x, 0), self.view.bounds.size.width);
  45. finalPoint.y = MIN(MAX(finalPoint.y, 0), self.view.bounds.size.height);
  47. [UIView animateWithDuration:slideFactor*2 delay:0 options:UIViewAnimationOptionCurveEaseOut animations:^{
  48. recognizer.view.center = finalPoint;
  49. } completion:nil];
  51. }
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   代碼實現解析：

  • 計算速度向量的長度（估計大部分都忘了）這些知識了。
  • 如果速度向量小于200，那就會得到一個小于的小數，那么滑行會很短
  • 基于速度和速度因素計算一個終點
  • 確保終點不會跑出父View的邊界
  • 使用UIView動畫使view滑動到終點
運行后，快速拖動圖像view放開會看到view還會在原來的方向滑行一段路。

8、同時觸發兩個view的手勢

手勢之間是互斥的，如果你想同時觸發蛇和龍的view，那么需要實現協議 

UIGestureRecognizerDelegate，


[cpp] view plaincopyprint?
  1. @interface ViewController : UIViewController<UIGestureRecognizerDelegate> 
  2. @end 
  3. @interface ViewController : UIViewController<UIGestureRecognizerDelegate>
  4. @end
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并在協議這個方法里返回YES。 

[cpp] view plaincopyprint?
  1. -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer 
  2. { 
  3. return YES; 
  4. } 
  5. -(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
  6. {
  7. return YES;
  8. }
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把self作為代理設置給手勢： 

[cpp] view plaincopyprint?
  1. panGestureRecognizer.delegate = self; 
  2. pinchGestureRecognizer.delegate = self; 
  3. rotateRecognizer.delegate = self; 
  4. panGestureRecognizer.delegate = self;
  5. pinchGestureRecognizer.delegate = self;
  6. rotateRecognizer.delegate = self;
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這樣可以同時拖動或旋轉縮放兩個view了。 

9、tap點擊手勢

這里為了方便看到tap的效果，當點擊一下屏幕時，播放一個聲音。


為了播放聲音，我們加入AVFoundation.framework這個框架。


[cpp] view plaincopyprint?
  1. - (AVAudioPlayer *)loadWav:(NSString *)filename { 
  2. NSURL * url = [[NSBundle mainBundle] URLForResource:filename withExtension:@"wav"]; 
  3. NSError * error; 
  4. AVAudioPlayer * player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error]; 
  5. if (!player) { 
  6. NSLog(@"Error loading %@: %@", url, error.localizedDescription); 
  7. } else { 
  8. [player prepareToPlay]; 
  9. } 
  10. return player; 
  11. } 
  12. - (AVAudioPlayer *)loadWav:(NSString *)filename {
  13. NSURL * url = [[NSBundle mainBundle] URLForResource:filename withExtension:@"wav"];
  14. NSError * error;
  15. AVAudioPlayer * player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:&error];
  16. if (!player) {
  17. NSLog(@"Error loading %@: %@", url, error.localizedDescription);
  18. } else {
  19. [player prepareToPlay];
  20. }
  21. return player;
  22. }
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我會在最后例子代碼給出完整代碼，添加手勢的步驟和前面一樣的。 

[cpp] view plaincopyprint?
  1. #import <UIKit/UIKit.h> 
  2. #import <AVFoundation/AVFoundation.h> 
  4. @interface ViewController : UIViewController<UIGestureRecognizerDelegate> 
  5. @property (strong) AVAudioPlayer * chompPlayer; 
  6. @property (strong) AVAudioPlayer * hehePlayer; 
  8. @end 
  9. #import <UIKit/UIKit.h>
  10. #import <AVFoundation/AVFoundation.h>
  12. @interface ViewController : UIViewController<UIGestureRecognizerDelegate>
  13. @property (strong) AVAudioPlayer * chompPlayer;
  14. @property (strong) AVAudioPlayer * hehePlayer;
  16. @end
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[cpp] view plaincopyprint?
  1. - (void)handleTap:(UITapGestureRecognizer *)recognizer { 
  2. [self.chompPlayer play]; 
  3. } 
  4. - (void)handleTap:(UITapGestureRecognizer *)recognizer {
  5. [self.chompPlayer play];
  6. }
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運行，點一下某個圖，就會播放一個咬東西的聲音。


不過這個點擊播放聲音有點缺陷，就是在慢慢拖動的時候也會播放。這使得兩個手勢重合了。怎么解決呢？使用手勢的：requireGestureRecognizerToFail方法。


10、手勢的依賴性

在viewDidLoad的循環里添加這段代碼：

[cpp] view plaincopyprint?
  1. [tapRecognizer requireGestureRecognizerToFail:panGestureRecognizer]; 
  2. [tapRecognizer requireGestureRecognizerToFail:panGestureRecognizer];
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意思就是，當如果pan手勢失敗，就是沒發生拖動，才會出發tap手勢。這樣如果你有輕微的拖動，那就是pan手勢發生了。tap的聲音就不會發出來了。 

11、自定義手勢


自定義手勢繼承：UIGestureRecognizer，實現下面的方法：


[cpp] view plaincopyprint?
  1. – touchesBegan:withEvent: 
  2. – touchesMoved:withEvent: 
  3. – touchesEnded:withEvent: 
  4. - touchesCancelled:withEvent: 
  5. – touchesBegan:withEvent:
  6. – touchesMoved:withEvent:
  7. – touchesEnded:withEvent:
  8. - touchesCancelled:withEvent:
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新建一個類，繼承UIGestureRecognizer，代碼如下：


.h文件


[cpp] view plaincopyprint?
  1. #import <UIKit/UIKit.h> 
  2. typedef enum { 
  3. DirectionUnknown = 0, 
  4. DirectionLeft, 
  5. DirectionRight 
  6. } Direction; 
  8. @interface HappyGestureRecognizer : UIGestureRecognizer 
  9. @property (assign) int tickleCount; 
  10. @property (assign) CGPoint curTickleStart; 
  11. @property (assign) Direction lastDirection; 
  13. @end 
  14. #import <UIKit/UIKit.h>
  15. typedef enum {
  16. DirectionUnknown = 0,
  17. DirectionLeft,
  18. DirectionRight
  19. } Direction;
  21. @interface HappyGestureRecognizer : UIGestureRecognizer
  22. @property (assign) int tickleCount;
  23. @property (assign) CGPoint curTickleStart;
  24. @property (assign) Direction lastDirection;
  26. @end
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.m文件 

[cpp] view plaincopyprint?
  1. #import "HappyGestureRecognizer.h" 
  2. #import <UIKit/UIGestureRecognizerSubclass.h> 
  3. #define REQUIRED_TICKLES 2 
  4. #define MOVE_AMT_PER_TICKLE 25 
  6. @implementation HappyGestureRecognizer 
  8. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { 
  9. UITouch * touch = [touches anyObject]; 
  10. self.curTickleStart = [touch locationInView:self.view]; 
  11. } 
  13. - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { 
  15. // Make sure we've moved a minimum amount since curTickleStart 
  16. UITouch * touch = [touches anyObject]; 
  17. CGPoint ticklePoint = [touch locationInView:self.view]; 
  18. CGFloat moveAmt = ticklePoint.x - self.curTickleStart.x; 
  19. Direction curDirection; 
  20. if (moveAmt < 0) { 
  21. curDirection = DirectionLeft; 
  22. } else { 
  23. curDirection = DirectionRight; 
  24. } 
  25. if (ABS(moveAmt) < MOVE_AMT_PER_TICKLE) return; 
  27. // 確認方向改變了 
  28. if (self.lastDirection == DirectionUnknown || 
  29. (self.lastDirection == DirectionLeft && curDirection == DirectionRight) || 
  30. (self.lastDirection == DirectionRight && curDirection == DirectionLeft)) { 
  32. // 撓癢次數 
  33. self.tickleCount++; 
  34. self.curTickleStart = ticklePoint; 
  35. self.lastDirection = curDirection; 
  37. // 一旦撓癢次數超過指定數，設置手勢為結束狀態 
  38. // 這樣回調函數會被調用。 
  39. if (self.state == UIGestureRecognizerStatePossible && self.tickleCount > REQUIRED_TICKLES) { 
  40. [self setState:UIGestureRecognizerStateEnded]; 
  41. } 
  42. } 
  44. } 
  46. - (void)reset { 
  47. self.tickleCount = 0; 
  48. self.curTickleStart = CGPointZero; 
  49. self.lastDirection = DirectionUnknown; 
  50. if (self.state == UIGestureRecognizerStatePossible) { 
  51. [self setState:UIGestureRecognizerStateFailed]; 
  52. } 
  53. } 
  55. - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event 
  56. { 
  57. [self reset]; 
  58. } 
  60. - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event 
  61. { 
  62. [self reset]; 
  63. } 
  65. @end 
  66. #import "HappyGestureRecognizer.h"
  67. #import <UIKit/UIGestureRecognizerSubclass.h>
  68. #define REQUIRED_TICKLES 2
  69. #define MOVE_AMT_PER_TICKLE 25
  71. @implementation HappyGestureRecognizer
  73. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
  74. UITouch * touch = [touches anyObject];
  75. self.curTickleStart = [touch locationInView:self.view];
  76. }
  78. - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
  80. // Make sure we've moved a minimum amount since curTickleStart
  81. UITouch * touch = [touches anyObject];
  82. CGPoint ticklePoint = [touch locationInView:self.view];
  83. CGFloat moveAmt = ticklePoint.x - self.curTickleStart.x;
  84. Direction curDirection;
  85. if (moveAmt < 0) {
  86. curDirection = DirectionLeft;
  87. } else {
  88. curDirection = DirectionRight;
  89. }
  90. if (ABS(moveAmt) < MOVE_AMT_PER_TICKLE) return;
  92. // 確認方向改變了
  93. if (self.lastDirection == DirectionUnknown ||
  94. (self.lastDirection == DirectionLeft && curDirection == DirectionRight) ||
  95. (self.lastDirection == DirectionRight && curDirection == DirectionLeft)) {
  97. // 撓癢次數
  98. self.tickleCount++;
  99. self.curTickleStart = ticklePoint;
  100. self.lastDirection = curDirection;
  102. // 一旦撓癢次數超過指定數，設置手勢為結束狀態
  103. // 這樣回調函數會被調用。
  104. if (self.state == UIGestureRecognizerStatePossible && self.tickleCount > REQUIRED_TICKLES) {
  105. [self setState:UIGestureRecognizerStateEnded];
  106. }
  107. }
  109. }
  111. - (void)reset {
  112. self.tickleCount = 0;
  113. self.curTickleStart = CGPointZero;
  114. self.lastDirection = DirectionUnknown;
  115. if (self.state == UIGestureRecognizerStatePossible) {
  116. [self setState:UIGestureRecognizerStateFailed];
  117. }
  118. }
  120. - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
  121. {
  122. [self reset];
  123. }
  125. - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
  126. {
  127. [self reset];
  128. }
  130. @end
復制代碼

調用自定義手勢和上面一樣，回到這樣寫： 

[cpp] view plaincopyprint?
  1. - (void)handleHappy:(HappyGestureRecognizer *)recognizer{ 
  2. [self.hehePlayer play]; 
  3. } 
  4. - (void)handleHappy:(HappyGestureRecognizer *)recognizer{
  5. [self.hehePlayer play];
  6. }
復制代碼

手勢成功后播放呵呵笑的聲音。

在真機上運行，按住某個view，快速左右拖動，就會發出笑的聲音了。 

代碼解析：

先獲取起始坐標：curTickleStart

通過和ticklePoint的x值對比，得出當前的放下是向左還是向右。再算出移動的x的值是否比MOVE_AMT_PER_TICKLE距離大，如果太則返回。
再判斷是否有三次是不同方向的動作，如果是則手勢結束，回調。


參考：http://www.raywenderlich.com/656 ... nches-pans-and-more


例子代碼：http://download.csdn.net/detail/totogo2010/5094059

原文鏈接：http://blog.csdn.net/totogo2010/article/details/8615940
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原文：http://bbs.9ria.com/thread-197251-1-1.html
相關：http://blog.csdn.net/likendsl/article/details/7554150

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