UIGesture 手势

ViewController.h

//协议 - 实现多个手势同时操作


//定义视图对象
UIImageView *_imageView;

//捏合手势,可以对视图放大缩小
UIPinchGestureRecognizer *_pinchGes;

//定义 旋转手势,旋转图片
UIRotationGestureRecognizer *_rotGes;

//平移 手势
UIPanGestureRecognizer *_pan;

//长按 手势
UISwipeGestureRecognizer *_swipe;

ViewController.m

//加载图像对象,从本地加载到内存中
UIImage *image = [UIImage imageNamed:@"123"];

//创建图像视图
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(34, 164, 306, 217)];

//将图像视图赋值
_imageView.image = image;

//按比例缩放。是啥样就是啥样,保持原来的样子
//    _imageView.contentMode = UIViewContentModeScaleAspectFit;
    
[self.view addSubview:_imageView];

//交互事件响应开关
//YES:可以交互,必须要设置
//NO:不能接收交互。默认是NO
_imageView.userInteractionEnabled = YES;

#pragma mark - 单击放大
//创建点击手势对象 self:响应事件的拥有者,self表示当前视图控制器  action: 响应事件的函数
UITapGestureRecognizer *tapOneGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOneAct:)];

//点击几次,才会触发   默认是1
tapOneGes.numberOfTapsRequired = 1;
//几个手指,点击触发   默认是1
tapOneGes.numberOfTouchesRequired = 1;

//将点击事件添加到视图中,视图即可响应事件
[_imageView addGestureRecognizer:tapOneGes];


//单击放大响应函数
//参数手势点击事件对象
- (void)tapOneAct:(UITapGestureRecognizer *)tap
{
    //随机背景颜色
    NSLog(@"放大");
//    float randomR = arc4random_uniform(255)/255.0;
//    float randomG = arc4random_uniform(255)/255.0;
//    float randomB = arc4random_uniform(255)/255.0;
//    
//    UIColor *randomColor = [UIColor colorWithRed:randomR   green:randomG blue:randomB alpha:1];
//    
//    self.view.backgroundColor = randomColor;
UIGesture 手势_第1张图片
单击随机颜色.gif
    //获取手势监控的视图对象
    UIImageView* imageView = (UIImageView*) tap.view;

    //开始动画过程
    [UIView beginAnimations:nil context:nil];

    //设置动画过渡时间
    [UIView setAnimationDuration:2];
    //缩放布满整个屏幕。  iPhone6  inch-4.7
    imageView.frame = CGRectMake(0, 0, 375, 667);

    //结束动画过程
    [UIView commitAnimations];

}
UIGesture 手势_第2张图片
单击放大.gif
#pragma mark - 双击缩小
UITapGestureRecognizer *tapTwoGes = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapTwoAct:)];
tapTwoGes.numberOfTapsRequired = 2;
tapTwoGes.numberOfTouchesRequired = 1;
[_imageView addGestureRecognizer:tapTwoGes];

#pragma bug 在原图情况下,会先放大,在缩小。从打印方式可以看出,双击会先出现放大,后出现缩小。  
# 解决方案 ↓
//当单击操作遇到双击操作时,单击操作失效
[tapOneGes requireGestureRecognizerToFail:tapTwoGes];


//双击缩小事件
- (void)tapTwoAct:(UITapGestureRecognizer *)tap
{
    NSLog(@"缩小");

    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationDuration:2];
    _imageView.frame = CGRectMake(34, 164, 306, 217);
    [UIView commitAnimations];

}
(先单击放大)双击缩小.gif
#pragma mark - 捏合 放大缩小
_pinchGes = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchAct:)];

//将捏合手势添加到视图上去
[_imageView addGestureRecognizer:_pinchGes];


//捏合-放大缩小事件  按住alt键
- (void)pinchAct:(UIPinchGestureRecognizer *)pinch
{
    NSLog(@"如果我有仙女棒,变大变小变漂亮");
    //对图像视图进行矩阵变换计算并赋值
    /*
     transform 图形学中的变换矩阵
     CGAffineTransformScale 通过缩放的方式产生一个新的矩阵
     参数1 : 原来的矩阵
     参数2 : x方向的缩放比例
     参数3 : y方向的缩放比例
     返回值是新的缩放后的矩阵变换
     */
    pinch.view.transform = CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);
    //将缩放值归为单位值,否则会出现累加
    /*
     scale = 1 原来的大小
     scale > 1 放大效果
     scale < 1 缩小效果
     */
    pinch.scale = 1;
}
捏合事件.gif
#pragma mark - 旋转
_rotGes = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotAct:)];

[_imageView addGestureRecognizer:_rotGes];


//旋转事件
- (void)rotAct:(UIRotationGestureRecognizer *)rot
{
     NSLog(@"看我歪头");
    rot.view.transform =   CGAffineTransformRotate(rot.view.transform, rot.rotation);
    //选择角度清零
    rot.rotation = 0;
}
旋转.gif
# 协议 - 同时识别手势
_rotGes.delegate = self;
_pinchGes.delegate = self;


//Simultaneously 同时识别手势 YES: 可以同时相应,NO: 不可以
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}
同时识别旋转放大缩小.gif
#pragma mark - 移动
_pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panAct:)];

[_imageView addGestureRecognizer:_pan];

#这里,为了避免和平扫冲突,所以取消掉移动的事件。
//将移动事件从图像视图中取消
//[_imageView removeGestureRecognizer:_pan];


//平移 事件  只要手指发生变化,函数就被调用
- (void)panAct:(UIPanGestureRecognizer *)pan
{
    //    NSLog(@"111111111111");
    //    //获取移动的坐标,相对于视图的坐标而言
    //    CGPoint pt = [pan translationInView:self.view];
    //    NSLog(@"pt.x = %.2f , pt.y = %.2f",pt.x,pt.y);
    //
    //    //获取移动时的 相对速度  每秒在屏幕移动像素的值
    //    CGPoint pv = [pan velocityInView:self.view];
    //    NSLog(@"pv.x = %.2f , pv.y = %.2f",pv.x,pv.y);

    //在pan.view上移动的距离
    CGPoint translation = [pan translationInView:pan.view];
    //view的中心
    CGPoint center = pan.view.center;
    //中心点.x + 移动距离.x
    center.x = center.x + translation.x;
    center.y = center.y + translation.y;
    pan.view.center = center;
    //清空移动距离
    [pan setTranslation:CGPointZero inView:pan.view];

}
UIGesture 手势_第3张图片
移动.gif
#pragma mark - 滑动(平扫)
_swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeAct:)];
/*
 UISwipeGestureRecognizerDirection
 
 Right  向右
 Left   向左
 Up     向上
 Down   向下
 */
//  | 位或
_swipe.direction = UISwipeGestureRecognizerDirectionLeft|UISwipeGestureRecognizerDirectionRight;

[_imageView addGestureRecognizer:_swipe];


//滑动 事件
- (void)swipeAct:(UISwipeGestureRecognizer *)swipe
{
    //    NSLog(@"向左滑动");
#pragma mark - 有问题 ,不能分别打印
    if (_swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"向左滑动");
    }else{
        NSLog(@"向右滑动");
    }
}
打印出向右滑动
#pragma mark - 长按
UILongPressGestureRecognizer *press = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pressLong:)];

//设置长按手势的时间,默认是0.5
press.minimumPressDuration = 3;

[_imageView addGestureRecognizer:press];


//长按事件
- (void)pressLong:(UILongPressGestureRecognizer *)press
{
    //手势的状态对象,到达规定时间(3s),触发函数
    if (press.state == UIGestureRecognizerStateBegan) {
        NSLog(@"开始!");
    }
    //当手指离开时,结束
    else if (press.state == UIGestureRecognizerStateEnded)
    {
        NSLog(@"结束!");
    }
    NSLog(@"长按");
}
UIGesture 手势_第4张图片
长按事件

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