UI- 五种手势识别总结

#pragma mark - 手势  总共有五种手势  分别为 Tap点击 Pan拖拽 LongPress长时间按压 Pinch捏合手势 rotation旋转

1. 定义成员变量

UIImageView *_imgView; 定义UIImageView， 响应手势方法时调用

CGPoint originalCenter;  记录一下拖拽手势起始位置

CGAffineTransform  originalTrans; 记录一下捏合、旋转手势起始位置

2. 定义ImageView

UIImageView *imgView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 100, 200, 200)];

imgView.image = [UIImage imageNamed:@"btn_02"];

[self.view addSubview:imgView];

_imgView = imgView; //赋值

3. 打开与用户的交互能力 （至关重要，不能忘记）

imgView.userInteractionEnabled = YES;

4.Tap手势 --> 点击1次/两次

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

把这个手势添加到视图中

[imgView addGestureRecognizer:tap];

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

dblTap.numberOfTapsRequired = 2;

[imgView addGestureRecognizer:dblTap];

4.1 点击手势响应的方法

-(void)onceTapped{

NSLog(@"onceTapped");

}

-(void)twiceTapped{

NSLog(@"twiceTapped");

}

5.Pan手势 --> 拖拽

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

[imgView addGestureRecognizer:pan];

5.1 拖拽时响应的方法

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

先记录一下起始位置

if (pan.state == UIGestureRecognizerStateBegan) {

originalCenter = imgView.center;

}

CGPoint transPoint = [pan translationInView:_imgView];

CGPoint center = originalCenter;

center.x += transPoint.x;

center.y += transPoint.y;

imgView.center = center;

CGPoint velocityPoint = [pan velocityInView:_imgView];

}

6. LongPress手势 --> 长时间按压

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

[imgView addGestureRecognizer:longPress];

longPress.minimumPressDuration = 1;

6.1 长时间按压响应的方法

-(void)longPressed{

NSLog(@"long Press");

}

7.  Pinch手势 --> 捏合手势

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

[imgView addGestureRecognizer:pinch];

7.1 捏合时响应的方法

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

if (pinch.state == UIGestureRecognizerStateBegan) {

originalTrans = _imgView.transform;

}

_imgView.transform = CGAffineTransformScale(originalTrans, pinch.scale, pinch.scale);

}

8. rotation手势 --> 旋转

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

[imgView addGestureRecognizer:rotation];

8.1 旋转手势响应的方法

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

if (rotation.state == UIGestureRecognizerStateBegan) {

originalTrans = _imgView.transform;

}

_imgView.transform = CGAffineTransformRotate(originalTrans, rotation.rotation);

if (rotation.state == UIGestureRecognizerStateEnded) {

_imgView.transform = originalTrans;

}

}