IOS手势

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。
[代码] 一个手指，拍击两次手势
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// 创建一个手势识别器
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UITapGestureRecognizer *oneFingerTwoTaps =
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[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];
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// Set required taps and number of touches
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[oneFingerTwoTaps setNumberOfTapsRequired:2];
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[oneFingerTwoTaps setNumberOfTouchesRequired:1];
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// Add the gesture to the view
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[[self view] addGestureRecognizer:oneFingerTwoTaps];
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消息方法oneFingerTwoTaps
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- (void)oneFingerTwoTaps
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{
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NSLog(@"Action: One finger, two taps");
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}
[代码] 两个手指，拍击两次手势
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UITapGestureRecognizer *twoFingersTwoTaps =
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[[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];
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[twoFingersTwoTaps setNumberOfTapsRequired:2];
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[twoFingersTwoTaps setNumberOfTouchesRequired:2];
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[[self view] addGestureRecognizer:twoFingersTwoTaps];
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消息方法twoFingersTwoTaps
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- (void)twoFingersTwoTaps {
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NSLog(@"Action: Two fingers, two taps");
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}
[代码] 一个手指向上、向下擦碰手势
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// 向上擦碰
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UISwipeGestureRecognizer *oneFingerSwipeUp =
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[[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];
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[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];
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[[self view] addGestureRecognizer:oneFingerSwipeUp];
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- (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
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{
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CGPoint point = [recognizer locationInView:[self view]];
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NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
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}
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// 向下擦碰
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UISwipeGestureRecognizer *oneFingerSwipeDown =
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[[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];
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[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
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[[self view] addGestureRecognizer:oneFingerSwipeDown];
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- (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer
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{
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CGPoint point = [recognizer locationInView:[self view]];
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NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);
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}
[代码] 旋转手势
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UIRotationGestureRecognizer *twoFingersRotate =
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[[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];
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[[self view] addGestureRecognizer:twoFingersRotate];
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- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
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{
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// Convert the radian value to show the degree of rotation
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NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
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}
[代码] 向里或向外捏的手势
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UIPinchGestureRecognizer *twoFingerPinch =
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[[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];
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[[self view] addGestureRecognizer:twoFingerPinch];
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- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
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{
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NSLog(@"Pinch scale: %f", recognizer.scale);
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}

补充：移动开发 , IOS ,