[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）

 - (void) testTap {
     // 创建手势识别器
     UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)];
     tapRec.numberOfTapsRequired = ; // 触发需要点击的次数
     tapRec.numberOfTouchesRequired = ; // 触发需要同时点击的点数目

     // 配置手势识别器到控件
     [self.hvwView addGestureRecognizer: tapRec];
 }

 /** tap手势的事件处理方法 */
 - (void) tapRun:(UITapGestureRecognizer *) tapRec {
     NSLog(@"tapRun");
 }

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

 - (void) testLongPress {
     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)];

     longRec.minimumPressDuration = ; // 长按生效时间
     longRec.allowableMovement = ; // 长按允许移动范围,单位：px

     [self.hvwView addGestureRecognizer:longRec];
 }

3.轻扫手势 UISwipeGestureRecognizer

direction：扫的方向 上下左右

 typedef enum {
    UISwipeGestureRecognizerDirectionRight =  << ,
    UISwipeGestureRecognizerDirectionLeft  =  << ,
    UISwipeGestureRecognizerDirectionUp    =  << ,
    UISwipeGestureRecognizerDirectionDown  =  <<
 } UISwipeGestureRecognizerDirection;

 - (void) testSwipe {
     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)];
     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 轻扫的方向

     [self.hvwView addGestureRecognizer:swipeRec];
 }

4.捏合手势 UIPinchGestureRecognizer

scale: 捏合的距离

 - (void) testPinch {
     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)];

     [self.hvwView addGestureRecognizer:rec];
 }

 - (void) pinchRun:(UIPinchGestureRecognizer *) rec {
     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale);

     // 一定要复位！！！不然按住捏合会不断叠加倍数
     rec.scale = ;
 }

 

5.旋转手势 UIRotationGestureRecognizer

rotation: 旋转了的角度

 - (void) testRotation {
     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)];

     [self.hvwView addGestureRecognizer:rotationRec];
 }

 - (void) rotationRun:(UIRotationGestureRecognizer *) rec {
     rec.view.transform = CGAffineTransformRotate(rec.view.transform, rec.rotation);

     // 一定要复位！！！不然会在按住旋转的时候会不断叠加rotation
     rec.rotation = ;
 }

6.拖曳手势 UIPanGestureRecognizer

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

 - (void) testPan {
     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)];

     [self.hvwView addGestureRecognizer:rec];
 }

 - (void) panRun:(UIPanGestureRecognizer *) rec {
     // 取得拖曳距离
     CGPoint movedDistance = [rec translationInView:rec.view];
     CGPoint viewCenter = rec.view.center;
     viewCenter.x += movedDistance.x;
     viewCenter.y += movedDistance.y;
     rec.view.center = viewCenter;

     // 复位拖曳距离
     [rec setTranslation:CGPointZero inView:rec.view];
 }

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：

 @interface ViewController () <UIGestureRecognizerDelegate>

2.给需要同时进行识别的手势识别器设置代理

 rec.delegate = self;

3.实现手势识别器同时使用方法

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

     // 任何两种手势识别器都能同时使用
     return YES;
 }

 //
 //  ViewController.m
 //  GestureRecognizerTest
 //
 //  Created by hellovoidworld on 15/1/13.
 //  Copyright (c) 2015年 hellovoidworld. All rights reserved.
 //

 #import "ViewController.h"

 @interface ViewController () <UIGestureRecognizerDelegate>

 @property (weak, nonatomic) IBOutlet UIView *hvwView;

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.

 //    [self testTap];
 //    [self testLongPress];
 //    [self testSwipe];
     [self testRotation];
     [self testPinch];
     [self testPan];
 }

 - (void) testTap {
     // 创建手势识别器
     UITapGestureRecognizer *tapRec = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapRun:)];
     tapRec.numberOfTapsRequired = ; // 触发需要点击的次数
     tapRec.numberOfTouchesRequired = ; // 触发需要同时点击的点数目

     // 配置手势识别器到控件
     [self.hvwView addGestureRecognizer: tapRec];
 }

 /** tap手势的事件处理方法 */
 - (void) tapRun:(UITapGestureRecognizer *) tapRec {
     NSLog(@"tapRun");
 }

 - (void) testLongPress {
     UILongPressGestureRecognizer *longRec = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressRun:)];

     longRec.minimumPressDuration = ; // 长按生效时间
     longRec.allowableMovement = ; // 长按允许移动范围,单位：px

     [self.hvwView addGestureRecognizer:longRec];
 }

 - (void) longPressRun:(UILongPressGestureRecognizer *) rec {
     NSLog(@"longPress");
 }

 - (void) testSwipe {
     UISwipeGestureRecognizer *swipeRec = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRun:)];
     swipeRec.direction = UISwipeGestureRecognizerDirectionRight; // 轻扫的方向

     [self.hvwView addGestureRecognizer:swipeRec];
 }

 - (void) swipeRun:(UISwipeGestureRecognizer *) rec {
     NSLog(@"swipe");
 }

 - (void) testRotation {
     UIRotationGestureRecognizer *rotationRec = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationRun:)];
     rotationRec.delegate = self;

     [self.hvwView addGestureRecognizer:rotationRec];
 }

 - (void) rotationRun:(UIRotationGestureRecognizer *) rec {
     rec.view.transform = CGAffineTransformRotate(self.hvwView.transform, rec.rotation);

     // 一定要复位！！！不然会在按住旋转的时候会不断叠加rotation
     rec.rotation = ;
 }

 - (void) testPinch {
     UIPinchGestureRecognizer *rec = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchRun:)];
     rec.delegate = self;

     [self.hvwView addGestureRecognizer:rec];
 }

 - (void) pinchRun:(UIPinchGestureRecognizer *) rec {
     rec.view.transform = CGAffineTransformScale(rec.view.transform, rec.scale, rec.scale);

     // 一定要复位！！！不然按住捏合会不断叠加倍数
     rec.scale = ;
 }

 - (void) testPan {
     UIPanGestureRecognizer *rec = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panRun:)];
     rec.delegate = self;

     [self.hvwView addGestureRecognizer:rec];
 }

 - (void) panRun:(UIPanGestureRecognizer *) rec {
     // 取得拖曳距离
     CGPoint movedDistance = [rec translationInView:rec.view];
     CGPoint viewCenter = rec.view.center;
     viewCenter.x += movedDistance.x;
     viewCenter.y += movedDistance.y;
     rec.view.center = viewCenter;

     // 复位拖曳距离
     [rec setTranslation:CGPointZero inView:rec.view];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
     // Dispose of any resources that can be recreated.
 }

 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {

     // 任何两种手势识别器都能同时使用
     return YES;
 }

 @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。