[ios] 使用iOS手势UIGestureRecognizer

老是忘记 mark以下

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： 
http://www.ctolive.com/space-1023-do-blog-id-2107.html 

 

标签： Objective-C  iOS

 

代码片段(5)

[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: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

01 UITapGestureRecognizer *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
02 UISwipeGestureRecognizer *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
14 UISwipeGestureRecognizer *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

1 UIRotationGestureRecognizer *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

1 UIPinchGestureRecognizer *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 }