手势

/**
 手势识别，是单独添加到某一个视图上的
 
 如果要同时支持多个手势识别，需要设置手势识别的代理！
 
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {
 return YES;
 }
 
 UIPanGestureRecognizer         拖动手势
 UIPinchGestureRecognizer       缩放手势
 UIRotationGestureRecognizer    旋转手势
 
 都是通过transform设置视图的形变
 
 一定记住设置完transform之后，需要将对应的形变参数复位！！！
 
 因为轻扫手势要求用户比较放松的扫动，因此最好不要将此手势添加到某一个视图上，会局限用户的操作
 
 1> 一般要添加到self.view上
 2> 如果要监听多个轻扫方向，需要添加多个轻扫手势
 长按手势一定要判断状态，否则方法会在手势开始和结束时分别调用！方法会被调用两次！
 */
#import "XZViewController.h"

@interface XZViewController () <UIGestureRecognizerDelegate]] >
@property (nonatomic, strong) UIImageView *imageView;
@end

@implementation XZViewController
- (void)viewDidLoad
{
    [super viewDidLoad];
    //加载图片视图
    [self imageView];
    //长按手势
   [self addLongPressGesture];
    //轻扫手势
    [self addSwipeGesture];
    //缩放（捏合）手势
    [self addPinchGesture];
    //旋转手势
    [self addRotateGesture];
    //点按（单击，点击）
    [self addTapGesture];
    //拖动手势
    [self addPanGesture];
}

//懒加载创建并添加imageView到view 上
- (UIImageView *)imageView
{
    if (_imageView == nil) {
        _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(60, 100, 200, 200)];
        _imageView.image = [UIImage imageNamed:@"头像1"];
        _imageView.userInteractionEnabled = YES;
        [self.view addSubview:_imageView];
    }
    return _imageView;
}


#pragma mark - 长按手势
- (void)addLongPressGesture
{
    //创建长按手势识别并添加监听事件
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
//    给图片添加长按手势
    [self.imageView addGestureRecognizer:longPress];
}

//识别到长按手势后回调的方法
- (void)longPress:(UILongPressGestureRecognizer *)recognizer
{
    // 判断手势的状态，长按手势一定要判断状态，否则方法会在手势开始和结束时分别调用！方法会被调用两次！
    if (recognizer.state == UIGestureRecognizerStateBegan) {
        //动画  改变图片的透明度
        [UIView animateWithDuration:0.5 animations:^{
            self.imageView.alpha = 0.5;
        } completion:^(BOOL finished) {
            [UIView animateWithDuration:0.5 animations:^{
                self.imageView.alpha = 1.0;
            }];
        }];
    }
}

#pragma mark - 轻扫手势
- (void)addSwipeGesture
{
    // 如果要监听多个轻扫方向，需要添加多个轻扫手势
    // 轻扫手势默认支持向右的扫动方向
   
    //创建轻扫手势识别并添加监听事件（默认是向右扫动）
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
   
    //创建轻扫手势识别并添加监听事件
    UISwipeGestureRecognizer *swipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    //direction 方向  向左轻扫
    swipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
   
    /**
     UISwipeGestureRecognizerDirectionRight  向右轻扫(默认)不设轻扫方向 就是向右
     UISwipeGestureRecognizerDirectionLeft  向左轻扫
     UISwipeGestureRecognizerDirectionUp    向上轻扫
     UISwipeGestureRecognizerDirectionDown  向下轻扫
     */

   
// 因为轻扫手势要求用户比较放松的扫动，因此最好不要将此手势添加到某一个视图上，会局限用户的操作
//    添加手势
    [self.view addGestureRecognizer:swipe];
    [self.view addGestureRecognizer:swipeLeft];
}

//识别到轻扫手势后回调的方法
- (void)swipe:(UISwipeGestureRecognizer *)recognizer
{
    //当前获取中心位置
    CGPoint from = self.imageView.center;
    //目标
    CGPoint to;
    //向左轻扫
    if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
        to = CGPointMake(-from.x, from.y);
    } else {//向右轻扫
        to = CGPointMake(3 * from.x, from.y);
    }
    //动画移动图片
    [UIView animateWithDuration:0.5 animations:^{
        self.imageView.center = to;
    }completion:^(BOOL finished) {
        [UIView animateWithDuration:0.5 animations:^{
            self.imageView.center = from;
        }];
    }];
}

#pragma mark - 拖动手势
- (void)addPanGesture
{
    //创建拖动手势 并添加手势的监听事件
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
   
    //添加手势
    [self.imageView addGestureRecognizer:pan];
}
//识别到拖动手势后回调的方法
- (void)pan:(UIPanGestureRecognizer *)recognizer
{
 //获取手指按在图片上的位置  以图片左上角为原点
    CGPoint translation = [recognizer translationInView:self.imageView];
//    移动图片
    recognizer.view.transform = CGAffineTransformTranslate(recognizer.view.transform, translation.x, translation.y);
    //给平移复位 因为他是在原有基础上当前递增平移 如果不复位  或清空他会越变越大
    [recognizer setTranslation:CGPointZero inView:self.imageView];
}

#warning mark - 手势识别代理方法
//Simultaneous同时识别两个手势识别
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

#pragma mark - 缩放（捏合）
- (void)addPinchGesture
{
    //创建缩放（捏合）手势 并添加手势的监听事件
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    //设置控制器为缩放手势的代理  可以实现同时识别两个手势
    pinch.delegate = self;
    [self.imageView addGestureRecognizer:pinch];
}
//识别到 缩放（捏合）手势后回调的方法
- (void)pinch:(UIPinchGestureRecognizer *)recognizer
{
    //绽放图片
    recognizer.view.transform = CGAffineTransformScale(recognizer.view.transform, recognizer.scale, recognizer.scale);
   
    //将缩放比例复位
    recognizer.scale = 1.0;
}

#pragma mark - 旋转
- (void)addRotateGesture
{
    //创建缩放 旋转并添加手势的监听事件
    UIRotationGestureRecognizer *rotate = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotate:)];
//设置控制器为缩放手势的代理  可以实现同时识别两个手势
    rotate.delegate = self;
//    添加手势
    [self.imageView addGestureRecognizer:rotate];
}
//识别到旋转手势后的回调方法
- (void)rotate:(UIRotationGestureRecognizer *)recognizer
{
    //图片旋转
    recognizer.view.transform = CGAffineTransformRotate(recognizer.view.transform, recognizer.rotation);
   
    //将手势识别的旋转角度复位
    recognizer.rotation = 0.0;  //非常重要  角度也会叠加
}

#pragma mark - 点按（单击，点击）
- (void)addTapGesture
{
    //创建缩放点按（单击，点击）并添加手势的监听事件
    UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tap)];
//    添加手势
    [self.imageView addGestureRecognizer:tapGesture];
   
}
//识别到手势后的回调方法
- (void)tap
{
    NSLog(@"点了");
}

@end