iOS－添加手势（文章结尾有完整代码）

手势，手势响应GestureRecognizer

关于手势响应IOS中封装了一个类，能响应一般手势UIGestureRecognizer

UIGestureRecognizerState的定义如下:

typedef enum {

UIGestureRecognizerStatePossible,

UIGestureRecognizerStateBegan,

UIGestureRecognizerStateChanged,

UIGestureRecognizerStateEnded,

UIGestureRecognizerStateCancelled,

UIGestureRecognizerStateFailed,

UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded

} UIGestureRecognizerState;

Possible: 识别器在未识别出它的手势，但可能会接收到触摸时处于这个状态。这是默认状态。

Began: 识别器接收到触摸并识别出是它的手势时处于这个状态。响应方法将在下个循环步骤中被调用。

Changed:the recognizer has received touches recognized as a change to the gesture. （不懂怎么翻译，理解上就是识别器识别出一个变化为它的手势的触摸），响应方法将在下个循环步骤中被调用。

Ended:识别器在识别到作为当前手势结束信号的触摸时处于这个状态。响应方法将在下个循环步骤中被调用 并且 识别器将重置为possible状态。

Cancelled:识别器处于取消状态.响应方法将在下个循环步骤中被调用 并且 识别器将重置为possible状态。

Failed: 识别器接收到不能识别为它的手势的一系列触摸。响应方法不会被调用 并且 识别器将重置为possible状态。

Recognized: 识别器已识别到它的手势。响应方法将在下个循环步骤中被调用 并且 识别器将重置为possible状态。

下面说一下这个UIGestureRecognizer 类

这个类有几个子类，这几个子类分别表示几种不同的基本手势

1、UITapGestureRecognizer //点击手势识别器，可以是点击一次，或多次都能识别

2、UIPinchGestureRecognizer //捏合手势识别器，用于视图的放大缩小

3、UIRotationGestureRecognizer //旋转手势识别器

4、UISwipeGestureRecognizer //滑动手势识别器，向上、下、左、右滑动

5、UIPanGestureRecognizer //拖动手势识别器

6、UILongPressGestureRecognizer //长按手势识别器，常见的有长按跳出一个界面用以编辑

手势状态枚举：

1 typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {

2    UIGestureRecognizerStatePossible,  // 尚未识别是何种手势操作（但可能已经触发了触摸事件），默认状态

3    UIGestureRecognizerStateBegan,      // 手势已经开始，此时已经被识别，但是这个过程中可能发生变化，手势操作尚未完成

4    UIGestureRecognizerStateChanged,    // 手势状态发生转变

5    UIGestureRecognizerStateEnded,      // 手势识别操作完成（此时已经松开手指）

6    UIGestureRecognizerStateCancelled,  // 手势被取消，恢复到默认状态

7    UIGestureRecognizerStateFailed,    // 手势识别失败，恢复到默认状态

8    UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded // 手势识别完成，同UIGestureRecognizerStateEnded

9 };

添加点击手势：

UITapGestureRecognizer *click1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(click1:)];

//设置这个点击手势识别器所能响应的点击次数，单击所以设成1，如果想双击，就设置为2，以此类推

click1.numberOfTapsRequired = 1;

//添加手势到视图上

[self.view addGestureRecognizer:click1];

//当有单击手势click1和双击手势click2的时候，需要加下面的代码用来判断，优先判断谁来响应方法

[click1 requireGestureRecognizerToFail:click2];

然后实现方法click1:就可以了

-(void)click1:(UITapGestureRecognizer *)sender{

}

添加滑动手势：

UISwipeGestureRecognizer *huaDong = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(huaDong:)];

//设置能识别滑动手势的方向，注意一个手势识别器只能识别一个方向上的滑动

huaDong.direction = UISwipeGestureRecognizerDirectionLeft;

huaDong.direction = UISwipeGestureRecognizerDirectionRight;

huaDong.direction = UISwipeGestureRecognizerDirectionUp;

huaDong.direction = UISwipeGestureRecognizerDirectionDown;

//添加手势到视图上

[self.view addGestureRecognizer:huaDong];

然后实现huaDong:方法就好了

-(void)huaDong:(UISwipeGestureRecognizer *)sender{

}

添加长按手势：

UILongPressGestureRecognizer *longClick = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longClick:)];

//设置长按多少秒后才识别这个手势

longClick.minimumPressDuration = 2;

//添加手势到视图上

[self.view addGestureRecognizer:longClick];

然后实现longClick:方法就好了

-(void)longClick:(UILongPressGestureRecognizer *)sender{

}

添加移动手势：

UIPanGestureRecognizer *move = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panGesture:)];

//添加手势到视图上

[self.view addGestureRecognizer:move];

可以根据平移时的位置的移动来拖动视图,获取位置,用这个方法可以获取到当前移动到得位置

 CGPoint point = [move locationInView:self.view];

添加捏合手势：

捏合有两个属性

@property (nonatomic,readonly) CGFloat velocity;// 捏合的速度

@property (nonatomic) CGFloat scale;// 比例（经常用到放缩比例) 这个属性默认值是1

//添加捏合手势

UIPinchGestureRecognizer *nieHe = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(nieHe:)];

[self.view addGestureRecognizer:nieHe];

添加旋转手势：

旋转也由两个属性

@property (nonatomic) CGFloat rotation; //旋转角度

@property (nonatomic,readonly) CGFloat velocity; //旋转速度

这个主要通过获取旋转角度来完成一些列操作

//添加旋转手势识别器

UIRotationGestureRecognizer *xuanZhuan = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(xuanZhuan:)];

[self.view addGestureRecognizer:xuanZhuan];

下面是一个完整的DEMO，直接拷贝到ViewController.m文件可以直接测试：

#import "ViewController.h"

@interface ViewController ()

// 比例（经常用到放缩比例) 这个属性默认值是1

@property (nonatomic) CGFloat scale;

// 捏合的速度/旋转速度(这个不需要设置)

@property (nonatomic,readonly) CGFloat velocity;

// 旋转角度

@property (nonatomic) CGFloat rotation;

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

[self nieHe];

}

#pragma mark 旋转手势

-(void)xuanZhuan{

// 添加一个旋转手势识别器

UIRotationGestureRecognizer *xuanZhuan = [[UIRotationGestureRecognizer alloc]initWithTarget:self action:@selector(xuanZhuan:)];

UIView *view = [[UIView alloc]initWithFrame:CGRectMake(20, 50, 300, 400)];

view.backgroundColor = [UIColor redColor];

[view addGestureRecognizer:xuanZhuan];

[self.view addSubview:view];

}

-(void)xuanZhuan:(UIRotationGestureRecognizer *)sender{

sender.view.transform = CGAffineTransformRotate(sender.view.transform, sender.rotation);

sender.rotation = 0;

NSLog(@"旋转了！！！");

}

#pragma mark 捏合手势

-(void)nieHe{

// 添加一个捏合手势识别器

UIPinchGestureRecognizer *nieHe = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(nieHe:)];

// 将手势添加到视图上面

[self.view addGestureRecognizer:nieHe];

}

-(void)nieHe:(UIPinchGestureRecognizer *)sender{

// 设置视图如何变化

sender.view.transform = CGAffineTransformScale(sender.view.transform, sender.scale, sender.scale);

// 最好写上这句话，测试的时候，你会发现视图找不到了。😢

sender.scale = 1;

NSLog(@"捏合啦！！");

}

#pragma mark 移动手势

-(void)move{

// 添加一个移动手势识别器

UIPanGestureRecognizer *move = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(move:)];

// 添加一个view用来方便的调试

UIView *view = [[UIView alloc]initWithFrame:CGRectMake(50, 50, 50, 50)];

// 设置view的背景颜色为红色

view.backgroundColor = [UIColor redColor];

// 给view添加移动手势

[view addGestureRecognizer:move];

// 将view添加到视图上面

[self.view addSubview:view];

}

-(void)move:(UIPanGestureRecognizer *)sender{

// 用这个方法可以获取到当前手势移动到得位置

CGPoint point = [sender locationInView:self.view];

// 可以根据平移时的位置的移动来拖动视图（改变视图的Center）

sender.view.center = CGPointMake(point.x,point.y);

NSLog(@"移动到了（%f，%f）这个点",point.x,point.y);

}

#pragma mark 长按手势

-(void)changClick{

// 添加一个长按手势识别器

UILongPressGestureRecognizer *longClick = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longClick:)];

// 设置长按多少秒后才识别这个手势

longClick.minimumPressDuration = 2;

// 添加手势到视图上

[self.view addGestureRecognizer:longClick];

}

-(void)longClick:(UILongPressGestureRecognizer *)sender{

NSLog(@"长按了！！！");

}

#pragma mark 左侧滑动手势

-(void)huaDongShouShi{

// 添加一个滑动手势识别器

UISwipeGestureRecognizer *huaDongLeft = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(huaDongLeft:)];

// 添加一个滑动手势识别器

UISwipeGestureRecognizer *huaDongRight = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(huaDongRight:)];

// 添加一个滑动手势识别器

UISwipeGestureRecognizer *huaDongUp = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(huaDongUp:)];

// 添加一个滑动手势识别器

UISwipeGestureRecognizer *huaDongDown = [[UISwipeGestureRecognizer alloc]initWithTarget:self action:@selector(huaDongDown:)];

// 设置能识别滑动手势的方向，注意一个手势识别器只能识别一个方向上的滑动,以左侧滑动为例子(如果想多方向监听滑动，可以多添加几个手势识别器)

// 左侧滑动

huaDongLeft.direction = UISwipeGestureRecognizerDirectionLeft;

// 右侧滑动

huaDongRight.direction = UISwipeGestureRecognizerDirectionRight;

// 向上滑动

huaDongUp.direction = UISwipeGestureRecognizerDirectionUp;

// 向下滑动

huaDongDown.direction = UISwipeGestureRecognizerDirectionDown;

// 添加手势到视图上

[self.view addGestureRecognizer:huaDongLeft];

[self.view addGestureRecognizer:huaDongRight];

[self.view addGestureRecognizer:huaDongUp];

[self.view addGestureRecognizer:huaDongDown];

}

-(void)huaDongLeft:(UISwipeGestureRecognizer *)sender{

NSLog(@"左滑了一下");

}

-(void)huaDongRight:(UISwipeGestureRecognizer *)sender{

NSLog(@"右滑了一下");

}

-(void)huaDongUp:(UISwipeGestureRecognizer *)sender{

NSLog(@"上滑了一下");

}

-(void)huaDongDown:(UISwipeGestureRecognizer *)sender{

NSLog(@"下滑了一下");

}

#pragma mark 点击手势

-(void)dianJiShouShi{

// 添加一个单击手势识别器

UITapGestureRecognizer *click1 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(click1:)];

// 其中1代表点击1次相应方法

click1.numberOfTapsRequired = 1;

// 添加一个双击手势识别器

UITapGestureRecognizer *click2 = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(click2:)];

// 其中2代表点击2次相应方法

click2.numberOfTapsRequired = 2;

// 将手势添加到视图上

[self.view addGestureRecognizer:click1];

[self.view addGestureRecognizer:click2];

// 这句话是关键，用来设置优先考虑响应哪个手势

[click1 requireGestureRecognizerToFail:click2];

}

-(void)click1:(UITapGestureRecognizer *)sender{

NSLog(@"单击了一下");

}

-(void)click2:(UITapGestureRecognizer *)sender{

NSLog(@"双击了一下");

}