[iOS UI进阶

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 = 3; // 触发需要点击的次数
    tapRec.numberOfTouchesRequired = 2; // 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 = 2; // 长按生效时间
    longRec.allowableMovement = 50; // 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 = 1 << 0,
   UISwipeGestureRecognizerDirectionLeft  = 1 << 1,
   UISwipeGestureRecognizerDirectionUp    = 1 << 2,
   UISwipeGestureRecognizerDirectionDown  = 1 << 3
} 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 = 1;
}

 

 

 

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 = 0;
}

 

 

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 = 3; // 触发需要点击的次数
    tapRec.numberOfTouchesRequired = 2; // 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 = 2; // 长按生效时间
    longRec.allowableMovement = 50; // 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 = 0;
}

- (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 = 1;
}

- (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。