Dawninest

Objective-C | 手势触摸

手势

建立手势对象

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_animationView = [[UIView alloc]init];
_animationView.bounds = CGRectMake(0, 0, 200, 200);
_animationView.center = self.view.center;
_animationView.backgroundColor = [UIColor colorWithRed:0.21 green:0.6 blue:0.93 alpha:1];
[self.view addSubview:_animationView];
//打开用户交互 如果是imageView，则需要打开交互
_animationView.userInteractionEnabled = YES;

单击手势

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1.初始化手势控制器-单击手势控制器
UITapGestureRecognizer *tapGes = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tapAnimationView:)];
2.为视图添加手势
[_animationView addGestureRecognizer:tapGes];

缩放手势

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UIPinchGestureRecognizer *pinchGes = [[UIPinchGestureRecognizer alloc]initWithTarget:self action:@selector(pinchAnimationView:)];
[_animationView addGestureRecognizer:pinchGes];
缩放事件
- (void)pinchAnimationView:(UIPinchGestureRecognizer *)gesture
{
	if (gesture.state ==  UIGestureRecognizerStateChanged) {
      /*
       UIGestureRecognizerStateBegan     开始－开始点击
       UIGestureRecognizerStateChanged   改变－每一次移动手指
       UIGestureRecognizerStateEnded     结束－手指挪开
       */
      CGAffineTransformScale变幻效果的叠加的
      当手势改变时执行缩放操作
      gesture.view.transform = CGAffineTransformScale(gesture.view.transform, gesture.scale, gesture.scale);
      保存缩放系数为1
      gesture.scale = 1;
  }
}

拖动手势

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UIPanGestureRecognizer *panGes = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAnimationView:)];
[_animationView addGestureRecognizer:panGes];
拖动事件
- (void)panAnimationView:(UIPanGestureRecognizer *)gesture
{
    if (gesture.state == UIGestureRecognizerStateChanged) {
        获取手指在指定视图(self.view)的移动坐标
        CGPoint transition = [gesture translationInView:self.view];
       更新 _animationView 的center
        gesture.view.center = CGPointMake(gesture.view.center.x + transition.x, gesture.view.center.y + transition.y);
        把增量设置为0
        [gesture setTranslation:CGPointZero inView:self.view];
    }
}

触摸

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触摸针对的是整个View，是视图控制器自带方法，用的时候直接重写
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
    [super touchesBegan:touches withEvent:event];
    //拿到当前点击位置 通过UITouch
    UITouch *nowTouch = touches.anyObject;
    CGPoint location = [nowTouch locationInView:self.view];
    //弹性动画
    //usingSpringWithDamping 阻尼系数 0-1 越小越明显
    //initialSpringVelocity 初始速度
    [UIView animateWithDuration:0.2 delay:0 usingSpringWithDamping:0.5 initialSpringVelocity:0 options:0 animations:^{
        //更新图片坐标-加动画
        _imageView.bounds = CGRectMake(0, 0, 120, 120);
        _imageView.center = location;
    } completion:^(BOOL finished){
        [UIView animateWithDuration:0.2 delay:0 usingSpringWithDamping:0.5 initialSpringVelocity:0 options:0 animations:^{
            _imageView.bounds = CGRectMake(0, 0, 80, 80);
        } completion:nil];
    }];
}