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UITapGestureRecognizer的用法

2013-08-19 10:11 323 查看

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。

1.[代码]一个手指，拍击两次手势

01	// 创建一个手势识别器

02	UITapGestureRecognizer *oneFingerTwoTaps=

03	[[[UITapGestureRecognizer alloc]initWithTarget:selfaction:@selector(oneFingerTwoTaps)]autorelease];

05	// Setrequiredtapsandnumberoftouches

06	[oneFingerTwoTaps setNumberOfTapsRequired:2];

07	[oneFingerTwoTaps setNumberOfTouchesRequired:1];

09	// Addthegesturetotheview

10	[[self view]addGestureRecognizer:oneFingerTwoTaps];

12	消息方法oneFingerTwoTaps

13	- ( void )oneFingerTwoTaps

15	NSLog(@ "Action: Onefinger,twotaps" );

2.[代码]两个手指，拍击两次手势

01	UITapGestureRecognizer *twoFingersTwoTaps=

02	[[[UITapGestureRecognizer alloc]initWithTarget:selfaction:@selector(twoFingersTwoTaps)]autorelease];

03	[twoFingersTwoTaps setNumberOfTapsRequired:2];

04	[twoFingersTwoTaps setNumberOfTouchesRequired:2];

05	[[self view]addGestureRecognizer:twoFingersTwoTaps];

07	消息方法twoFingersTwoTaps

08	- ( void )twoFingersTwoTaps {

09	NSLog(@ "Action: Twofingers,twotaps" );

3.[代码]一个手指向上、向下擦碰手势

//
向上擦碰

02	UISwipeGestureRecognizer *oneFingerSwipeUp=

03	[[[UISwipeGestureRecognizer alloc]initWithTarget:selfaction:@selector(oneFingerSwipeUp:)]autorelease];

04	[oneFingerSwipeUp setDirection:UISwipeGestureRecognizerDirectionUp];

05	[[self view]addGestureRecognizer:oneFingerSwipeUp];

07	- ( void )oneFingerSwipeUp:(UISwipeGestureRecognizer *)recognizer

09	CGPoint point=[recognizerlocationInView:[selfview]];

10	NSLog(@ "Swipe up-startlocation:%f,%f" , point.x,point.y);

//
向下擦碰

14	UISwipeGestureRecognizer *oneFingerSwipeDown=

15	[[[UISwipeGestureRecognizer alloc]initWithTarget:selfaction:@selector(oneFingerSwipeDown:)]autorelease];

16	[oneFingerSwipeDown setDirection:UISwipeGestureRecognizerDirectionDown];

17	[[self view]addGestureRecognizer:oneFingerSwipeDown];

19	- ( void )oneFingerSwipeDown:(UISwipeGestureRecognizer *)recognizer

21	CGPoint point=[recognizerlocationInView:[selfview]];

22	NSLog(@ "Swipe down-startlocation:%f,%f" , point.x,point.y);

4.[代码]旋转手势

1	UIRotationGestureRecognizer *twoFingersRotate=

2	[[[UIRotationGestureRecognizer alloc]initWithTarget:selfaction:@selector(twoFingersRotate:)]autorelease];

3	[[self view]addGestureRecognizer:twoFingersRotate];

5	- ( void )twoFingersRotate:(UIRotationGestureRecognizer *)recognizer

7	// Converttheradianvaluetoshowthedegreeofrotation

8	NSLog(@ "Rotation indegreessincelastchange:%f" , [recognizerrotation]*(180/M_PI));

5.[代码]向里或向外捏的手势跳至[1][2][3][4][5][全屏预览]

view
source

print?

1	UIPinchGestureRecognizer *twoFingerPinch=

2	[[[UIPinchGestureRecognizer alloc]initWithTarget:selfaction:@selector(twoFingerPinch:)]autorelease];

3	[[self view]addGestureRecognizer:twoFingerPinch];

5	- ( void )twoFingerPinch:(UIPinchGestureRecognizer *)recognizer

7	NSLog(@ "Pinch scale:%f" , recognizer.scale);

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