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：
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Objective-C iOS[代码] 一个手指，拍击两次手势
01// 创建一个手势识别器
02UITapGestureRecognizer *oneFingerTwoTaps =
03 [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerTwoTaps)] autorelease];
04
05// Set required taps and number of touches
06[oneFingerTwoTaps setNumberOfTapsRequired:2];
07[oneFingerTwoTaps setNumberOfTouchesRequired:1];
08
09// Add the gesture to the view
10[[self view] addGestureRecognizer:oneFingerTwoTaps];
11
12消息方法oneFingerTwoTaps
13- (void)oneFingerTwoTaps
14{
15 NSLog(@"Action: One finger, two taps");
16}
[代码] 两个手指，拍击两次手势
01UITapGestureRecognizer *twoFingersTwoTaps =
02 [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersTwoTaps)] autorelease];
03[twoFingersTwoTaps setNumberOfTapsRequired:2];
04[twoFingersTwoTaps setNumberOfTouchesRequired:2];
05[[self view] addGestureRecognizer:twoFingersTwoTaps];
06
07消息方法twoFingersTwoTaps
08- (void)twoFingersTwoTaps {
09 NSLog(@"Action: Two fingers, two taps");
10}
[代码] 一个手指向上、向下擦碰手势
01// 向上擦碰
02UISwipeGestureRecognizer *oneFingerSwipeUp =
03 [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeUp:)] autorelease];
04[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];
05[[self view] addGestureRecognizer:oneFingerSwipeUp];
06
07- (void)oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer
08{
09 CGPoint point = [recognizer locationInView:[self view]];
10 NSLog(@"Swipe up - start location: %f,%f", point.x, point.y);
11}
12
13// 向下擦碰
14UISwipeGestureRecognizer *oneFingerSwipeDown =
15 [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(oneFingerSwipeDown:)] autorelease];
16[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];
17[[self view] addGestureRecognizer:oneFingerSwipeDown];
18
19- (void)oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer
20{
21 CGPoint point = [recognizer locationInView:[self view]];
22 NSLog(@"Swipe down - start location: %f,%f", point.x, point.y);
23}
[代码] 旋转手势
1UIRotationGestureRecognizer *twoFingersRotate =
2 [[[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingersRotate:)] autorelease];
3[[self view] addGestureRecognizer:twoFingersRotate];
4
5- (void)twoFingersRotate:(UIRotationGestureRecognizer *)recognizer
6{
7 // Convert the radian value to show the degree of rotation
8 NSLog(@"Rotation in degrees since last change: %f", [recognizer rotation] * (180 / M_PI));
9}
[代码] 向里或向外捏的手势
1UIPinchGestureRecognizer *twoFingerPinch =
2 [[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];
3[[self view] addGestureRecognizer:twoFingerPinch];
4
5- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer
6{
7 NSLog(@"Pinch scale: %f", recognizer.scale);
8}
