ios 手势 常用代码段代码段

ios 手势 代码段 转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
view sourceprint?


UIPinchGestureRecognizer *twoFingerPinch =


[[[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(twoFingerPinch:)] autorelease];


[[self view] addGestureRecognizer:twoFingerPinch];






- (void)twoFingerPinch:(UIPinchGestureRecognizer *)recognizer


{


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