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使用iOS手势UIGestureRecognizer(转)  

2012-10-29 13:43:57|  分类: 默认分类 |  标签: |举报 |字号 订阅

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转自:http://www.oschina.net/code/snippet_54100_8106

UIKit中包含了UIGestureRecognizer类,用于检测发生在设备中的手势。UIGestureRecognizer是一个抽象类,定义了所有手势的基本行为,它有下面一些子类用于处理具体的手势:

    1、拍击UITapGestureRecognizer (任意次数的拍击) 
    2、向里或向外捏UIPinchGestureRecognizer (用于缩放) 
    3、摇动或者拖拽UIPanGestureRecognizer 
    4、擦碰UISwipeGestureRecognizer (以任意方向) 
    5、旋转UIRotationGestureRecognizer (手指朝相反方向移动) 
    6、长按UILongPressGestureRecognizer

对于不同类型的手势识别器,具有不同的配置属性。比如UITapGestureRecognizer,可以配置拍击次数。界面接收到手势之后,可以发送一个消息,用于处理响应手势动作后的任务。当然,不同的手势识别器,发送的消息方法也会有所不同。下面列举几个具体示例代码:

[代码] 一个手指,拍击两次手势

// 创建一个手势识别器
UITapGestureRecognizer *oneFingerTwoTaps =
  [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];
 
// Set required taps and number of touches
[oneFingerTwoTaps setNumberOfTapsRequired:2];
[oneFingerTwoTaps setNumberOfTouchesRequired:1];
 
// Add the gesture to the view
[[self view] addGestureRecognizer:oneFingerTwoTaps];

消息方法oneFingerTwoTaps
- (void)oneFingerTwoTaps
{
  NSLog(@"Action: One finger, two taps");
}

[代码] 两个手指,拍击两次手势

UITapGestureRecognizer *twoFingersTwoTaps =
  [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];
[twoFingersTwoTaps setNumberOfTapsRequired:2];
[twoFingersTwoTaps setNumberOfTouchesRequired:2];
[[self view] addGestureRecognizer:twoFingersTwoTaps];

消息方法twoFingersTwoTaps
- (void)twoFingersTwoTaps {
  NSLog(@"Action: Two fingers, two taps");
}

[代码] 一个手指向上、向下擦碰手势

// 向上擦碰
UISwipeGestureRecognizer *oneFingerSwipeUp =
  [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];
[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];
[[self view] addGestureRecognizer:oneFingerSwipeUp];

- (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
{
  CGPoint point = [recognizer locationInView:[self view]];
  NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
}

// 向下擦碰
UISwipeGestureRecognizer *oneFingerSwipeDown =
  [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];
[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
[[self view] addGestureRecognizer:oneFingerSwipeDown];

- (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer
{
  CGPoint point = [recognizer locationInView:[self view]];
  NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);
}

[代码] 旋转手势

UIRotationGestureRecognizer *twoFingersRotate =
  [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];
[[self view] addGestureRecognizer:twoFingersRotate];

- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
{
  // Convert the radian value to show the degree of rotation
  NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
}

[代码] 向里或向外捏的手势

UIPinchGestureRecognizer *twoFingerPinch =
  [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];
[[self view] addGestureRecognizer:twoFingerPinch];

- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
{
  NSLog(@"Pinch scale: %f", recognizer.scale);
}


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