[iOS UI进阶 - 3.2] 手势识别器UIGestureRecognizer

A.系统提供的手势识别器

1.敲击手势 UITapGestureRecognizer

numberOfTapsRequired： 敲击次数

numberOfTouchesRequired： 同时敲击触碰数（手指数）

 1 - (void) testTap {
 2     // 创建手势识别器
 3     UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)];
 4     tapRec.numberOfTapsRequired = 3; // 触发需要点击的次数
 5     tapRec.numberOfTouchesRequired = 2; // 触发需要同时点击的点数目
 6
 7     // 配置手势识别器到控件
 8     [self.hvwView addGestureRecognizer: tapRec];
 9 }
10
11 /** tap手势的事件处理方法 */
12 - (void) tapRun:(UITapGestureRecognizer *) tapRec {
13     NSLog(@"tapRun");
14 }

2.长按手势 UILongPressGestureRecognizer

minimumPressDuration:长按生效时间

numberOfTouchesRequired:需要的同时点击数

numberOfTapsRequired:需要的点击次数

allowableMovement:长按有效移动范围（从点击开始，长按移动的允许范围）

ps：移动的时候会不断调用目标方法

1 - (void) testLongPress {
2     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)];
3
4     longRec.minimumPressDuration = 2; // 长按生效时间
5     longRec.allowableMovement = 50; // 长按允许移动范围,单位：px
6
7     [self.hvwView addGestureRecognizer:longRec];
8 }

3.轻扫手势 UISwipeGestureRecognizer

direction：扫的方向 上下左右

1 typedef enum {
2    UISwipeGestureRecognizerDirectionRight = 1 << 0,
3    UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
4    UISwipeGestureRecognizerDirectionUp    = 1 << 2,
5    UISwipeGestureRecognizerDirectionDown  = 1 << 3
6 } UISwipeGestureRecognizerDirection;

1 - (void) testSwipe {
2     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)];
3     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 轻扫的方向
4
5     [self.hvwView addGestureRecognizer:swipeRec];
6 }

4.捏合手势 UIPinchGestureRecognizer

scale: 捏合的距离

 1 - (void) testPinch {
 2     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)];
 3
 4     [self.hvwView addGestureRecognizer:rec];
 5 }
 6
 7 - (void) pinchRun:(UIPinchGestureRecognizer *) rec {
 8     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale);
 9
10     // 一定要复位！！！不然按住捏合会不断叠加倍数
11     rec.scale = 1;
12 }

5.旋转手势 UIRotationGestureRecognizer

rotation: 旋转了的角度

 1 - (void) testRotation {
 2     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)];
 3
 4     [self.hvwView addGestureRecognizer:rotationRec];
 5 }
 6
 7 - (void) rotationRun:(UIRotationGestureRecognizer *) rec {
 8     rec.view.transform = CGAffineTransformRotate(rec.view.transform, rec.rotation);
 9
10     // 一定要复位！！！不然会在按住旋转的时候会不断叠加rotation
11     rec.rotation = 0;
12 }

6.拖曳手势 UIPanGestureRecognizer

相对始点拖曳距离：[pan translationInView:pan.view]

 1 - (void) testPan {
 2     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)];
 3
 4     [self.hvwView addGestureRecognizer:rec];
 5 }
 6
 7 - (void) panRun:(UIPanGestureRecognizer *) rec {
 8     // 取得拖曳距离
 9     CGPoint movedDistance = [rec translationInView:rec.view];
10     CGPoint viewCenter = rec.view.center;
11     viewCenter.x += movedDistance.x;
12     viewCenter.y += movedDistance.y;
13     rec.view.center = viewCenter;
14
15     // 复位拖曳距离
16     [rec setTranslation:CGPointZero inView:rec.view];
17 }

B.一般情况只能使用一个识别器，使用代理设置才能同时使用多个识别器

1.遵守协议：

1 @interface ViewController () <UIGestureRecognizerDelegate>

2.给需要同时进行识别的手势识别器设置代理

1 rec.delegate = self;

3.实现手势识别器同时使用方法

1 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
2
3     // 任何两种手势识别器都能同时使用
4     return YES;
5 }

  1 //
  2 //  ViewController.m
  3 //  GestureRecognizerTest
  4 //
  5 //  Created by hellovoidworld on 15/1/13.
  6 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
  7 //
  8
  9 #import "ViewController.h"
 10
 11 @interface ViewController () <UIGestureRecognizerDelegate>
 12
 13 @property (weak, nonatomic) IBOutlet UIView *hvwView;
 14
 15 @end
 16
 17 @implementation ViewController
 18
 19 - (void)viewDidLoad {
 20     [super viewDidLoad];
 21     // Do any additional setup after loading the view, typically from a nib.
 22
 23 //    [self testTap];
 24 //    [self testLongPress];
 25 //    [self testSwipe];
 26     [self testRotation];
 27     [self testPinch];
 28     [self testPan];
 29 }
 30
 31 - (void) testTap {
 32     // 创建手势识别器
 33     UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)];
 34     tapRec.numberOfTapsRequired = 3; // 触发需要点击的次数
 35     tapRec.numberOfTouchesRequired = 2; // 触发需要同时点击的点数目
 36
 37     // 配置手势识别器到控件
 38     [self.hvwView addGestureRecognizer: tapRec];
 39 }
 40
 41 /** tap手势的事件处理方法 */
 42 - (void) tapRun:(UITapGestureRecognizer *) tapRec {
 43     NSLog(@"tapRun");
 44 }
 45
 46 - (void) testLongPress {
 47     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)];
 48
 49     longRec.minimumPressDuration = 2; // 长按生效时间
 50     longRec.allowableMovement = 50; // 长按允许移动范围,单位：px
 51
 52     [self.hvwView addGestureRecognizer:longRec];
 53 }
 54
 55 - (void) longPressRun:(UILongPressGestureRecognizer *) rec {
 56     NSLog(@"longPress");
 57 }
 58
 59 - (void) testSwipe {
 60     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)];
 61     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 轻扫的方向
 62
 63     [self.hvwView addGestureRecognizer:swipeRec];
 64 }
 65
 66 - (void) swipeRun:(UISwipeGestureRecognizer *) rec {
 67     NSLog(@"swipe");
 68 }
 69
 70 - (void) testRotation {
 71     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)];
 72     rotationRec.delegate = self;
 73
 74     [self.hvwView addGestureRecognizer:rotationRec];
 75 }
 76
 77 - (void) rotationRun:(UIRotationGestureRecognizer *) rec {
 78     rec.view.transform = CGAffineTransformRotate(self.hvwView.transform, rec.rotation);
 79
 80     // 一定要复位！！！不然会在按住旋转的时候会不断叠加rotation
 81     rec.rotation = 0;
 82 }
 83
 84 - (void) testPinch {
 85     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)];
 86     rec.delegate = self;
 87
 88     [self.hvwView addGestureRecognizer:rec];
 89 }
 90
 91 - (void) pinchRun:(UIPinchGestureRecognizer *) rec {
 92     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale);
 93
 94     // 一定要复位！！！不然按住捏合会不断叠加倍数
 95     rec.scale = 1;
 96 }
 97
 98 - (void) testPan {
 99     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)];
100     rec.delegate = self;
101
102     [self.hvwView addGestureRecognizer:rec];
103 }
104
105 - (void) panRun:(UIPanGestureRecognizer *) rec {
106     // 取得拖曳距离
107     CGPoint movedDistance = [rec translationInView:rec.view];
108     CGPoint viewCenter = rec.view.center;
109     viewCenter.x += movedDistance.x;
110     viewCenter.y += movedDistance.y;
111     rec.view.center = viewCenter;
112
113     // 复位拖曳距离
114     [rec setTranslation:CGPointZero inView:rec.view];
115 }
116
117 - (void)didReceiveMemoryWarning {
118     [super didReceiveMemoryWarning];
119     // Dispose of any resources that can be recreated.
120 }
121
122 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
123
124     // 任何两种手势识别器都能同时使用
125     return YES;
126 }
127
128 @end

#mark:

因为使用的是transform形变进行缩放、旋转，所以再进行拖曳的时候是不能正常进行的。