使用iOS手势UIGestureRecognizer

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使用iOS手势UIGestureRecognizer

2018年01月08日 ⁄ 综合 ⁄ 共 3150字 ⁄ 字号小中大 ⁄ 评论关闭

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

view

 source

print?

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

}

【上篇】IOS开发之手势——UIGestureRecognizer 共存
【下篇】UITapGestureRecognizer 的用法

作者: mabel

该日志由 mabel 于6年前发表在综合分类下，最后更新于 2018年01月08日.
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