手势

手势

点击（长按）、拖拽、旋转、捏合、轻扫都属于手势，继承自UIGestureRecognizer这个父类

一、添加背景颜色

self.view.backgroundColor = [UIColor whiteColor];

注：如果不设置背景颜色的话，有可能不会响应手势

手势如果不响应：

1）看是否添加到了imageView上，如果是，把userInteractionEnabled设置成YES

2）查看背景颜色是否设置，如果没有设置，就设置背景颜色

3）手势冲突，截获触发事件、手势，设置优先级

    

   

二、点击（UITapGestureRecognizer）

1）初始化

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

    

2）设置点击手指的个数

tap.numberOfTouchesRequired = 1;

3）设置手指点击的次数

tap.numberOfTapsRequired = 1;

 

4）添加到View   

[self.view addGestureRecognizer:tap];

注：

tapAction:为点击手势触发时执行的事件

具体实现：

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

//    恢复视图的初始形态（transform和手势没有关系）

    imageView.transform = CGAffineTransformIdentity;

//    得到点击处的坐标值   

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

//   分别输出x、y的坐标，用于检测与验证

    NSLog(@"%f %f", tapLoc.x, tapLoc.y);

//    实现一个动画的效果   

    [UIView animateWithDuration:1 animations:^{

        //    点击的位置设置为图片的中心点

        imageView.center = tapLoc;

    }];

    

       

三、长按（UILongPressGestureRecognizer）

1）初始化

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

2）最小按下的持续时间（默认0.5秒）

longPress.minimumPressDuration = 1;

3）设置手指点击的次数

longPress.numberOfTouchesRequired = 2;

    

4）把手势添加到某个视图上

[self.view addGestureRecognizer:longPress];

  

注：

longPress:为长按手势触发时执行的事件

具体实现

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

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

    [UIView animateWithDuration:2 animations:^{

        imageView.center = tapLoc;

    }];

}

  

四、拖拽（UIPanGestureRecognizer）

1）初始化

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

1）设置最少的手指个数

pan.minimumNumberOfTouches = 1;

2）设置最多的手指个数

pan.maximumNumberOfTouches = 2;

    

3）添加手势

[self.view addGestureRecognizer:pan];

  

注：

pan:为拖拽手势触发时执行的事件

具体实现

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

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

    imageView.center = tapLoc;

}

  

    

五、轻扫（UISwipeGestureRecognizer）

1）初始化

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

2）设置轻扫方向

swipe.direction = UISwipeGestureRecognizerDirectionLeft;

    

3）处理拖拽和轻扫两个手势的冲突（需要轻扫手势执行完毕之后再去执行拖拽手势）

[pan requireGestureRecognizerToFail:swipe];

    

4、添加手势到某个视图

[self.view addGestureRecognizer:swipe];

注：

swipe:为轻扫手势触发时执行的事件

具体实现

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

    self.view.frame = CGRectMake(CGRectGetWidth([UIScreen mainScreen].bounds), 0, CGRectGetWidth([UIScreen mainScreen].bounds), CGRectGetHeight([UIScreen mainScreen].bounds));

    

    [UIView animateWithDuration:2 animations:^{

        self.view.frame = CGRectMake(0, 0, CGRectGetWidth([UIScreen mainScreen].bounds), CGRectGetHeight([UIScreen mainScreen].bounds));

    }];

}

      

六、捏合（UIPinchGestureRecognizer）

1）初始化

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

2）添加到某个视图

[self.view addGestureRecognizer:pinch];

 

注：

pinch:为捏合手势触发时执行的事件

具体实现

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

//    通过手势得到变化比例，让imageView的形态发生改变

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

    imageView.center = self.view.center;

}

      

七、旋转（UIRotationGestureRecognizer）

1）初始化   

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

    

2）添加到某个视图    

[self.view addGestureRecognizer:rotation];

   

注：

rotation:为旋转手势触发时执行的事件

具体实现

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

//    通过旋转手势让图片进行相同的变形

    imageView.transform = CGAffineTransformMakeRotation(sender.rotation);

}

例：找色块游戏的简单实现

#import "ViewController.h"

#define WIDTH CGRectGetWidth([UIScreen mainScreen].bounds)     //屏幕的宽

#define HIGHT CGRectGetHeight([UIScreen mainScreen].bounds)     //屏幕的高

@interface ViewController ()

{

    UIImageView *backgroundImage;

    NSArray *colorList; //颜色数组

    UIView *view;       //色块

    int n;              //循环次数

    int numToButtun;    //确定随机色块

}

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    

    n = 2;  //设置初始循环量

    

    colorList = @[[UIColor darkGrayColor], [UIColor lightGrayColor], [UIColor whiteColor], [UIColor grayColor], [UIColor redColor], [UIColor greenColor], [UIColor blueColor], [UIColor cyanColor], [UIColor yellowColor], [UIColor magentaColor], [UIColor orangeColor], [UIColor purpleColor], [UIColor brownColor]];

    [self creatView:n];

}

// 创建色块

- (void)creatView:(int)num {

    //    添加背景图

    backgroundImage = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];

    backgroundImage.image = [UIImage imageNamed:@"bg"];

    [self.view addSubview:backgroundImage];

    

//    num:循环次数 number:颜色数组的随机下标值

    int number = arc4random()%colorList.count;

    numToButtun = arc4random()%(num*num);

    for (int i = 0; i < num; i ++) {

        for (int j = 0; j < num; j ++) {

            

            view = [[UIView alloc]initWithFrame:CGRectMake(10 + ((WIDTH - ((num+1)*10))/num + 10) * j, 100 + ((WIDTH - ((num+1)*10))/num + 10) * i , (WIDTH - ((num+1)*10))/num, (WIDTH - ((num+1)*10))/num)];

            

                view.tag = 1+(num*j+i);

                view.backgroundColor = colorList[number];

            

            if (view.tag == (numToButtun + 1)) {

                view.alpha = 0.7;

                

                //    点击手势

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

                [view addGestureRecognizer:tap];

        

            }

                [self.view addSubview:view];

            

        }

        

    }

    

}

- (void)judge {

    n += 1;

    if (n < 21) {

        [view removeFromSuperview];

        [self creatView:n];

    }else{

        n = 20;

        [view removeFromSuperview];

        [self creatView:n];

    }

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end