iOS - UIGestureRecognizer

前言

NS_CLASS_AVAILABLE_IOS(3_2) @interface UIGestureRecognizer : NSObject
@available(iOS 3.2, *) public class UIGestureRecognizer : NSObject// 点击（轻点）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UITapGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UITapGestureRecognizer : UIGestureRecognizer// 长按（按住不放）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UILongPressGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UILongPressGestureRecognizer : UIGestureRecognizer// 旋转（两个手指进行旋转）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UIRotationGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UIRotationGestureRecognizer : UIGestureRecognizer// 捏合（两个手指，缩放手势）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UIPinchGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UIPinchGestureRecognizer : UIGestureRecognizer// 拖动（移动速度较慢）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UIPanGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UIPanGestureRecognizer : UIGestureRecognizer// 滑动（快速移动）
NS_CLASS_AVAILABLE_IOS(3_2) @interface UISwipeGestureRecognizer : UIGestureRecognizer
@available(iOS 3.2, *) public class UISwipeGestureRecognizer : UIGestureRecognizer


1、tapGesture 点击手势

1.1 tapGesture 的创建

• Objective-C

  // 实例化点击手势对象
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self
action:@selector(tapClick:)];// 向 imageView 添加点击手势
[imageView addGestureRecognizer:tapGesture];


• Swift

  // 实例化点击手势对象
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.tapClick(_:))) // 向 imageView 添加点击手势
imageView?.addGestureRecognizer(tapGesture)


1.2 tapGesture 的设置

• Objective-C

  // 设置点击次数
/*
默认为 1：单击，为 2 时为双击
*/
singleTapGesture.numberOfTapsRequired = 1;// 设置触摸点数
/*
默认为 1，单个手指触摸
*/
singleTapGesture.numberOfTouchesRequired = 1;// 单双击共存
/*
设置单击手势与双击手势共存，当没有检测到双击手势或检测双击手势失败时单击手势才有效
*/
[singleTapGesture requireGestureRecognizerToFail:doubleTapGesture];// 获取点击的视图
/*
剪取点击的视图，附带点击手势一起剪取
*/
UIView *tapView = tapGesture.view;// 获取点击的图片
/*
复制点击的图片，附带点击手势一起复制
*/
UIImage *tapImage = ((UIImageView *)tapGesture.view).image;


• Swift

  // 设置点击次数
/*
默认为 1：单击，为 2 时为双击
*/
singleTapGesture.numberOfTapsRequired = 1// 设置触摸点数
/*
默认为 1，单个手指触摸
*/
singleTapGesture.numberOfTouchesRequired = 1// 单双击共存
/*
设置单击手势与双击手势共存，当没有检测到双击手势或检测双击手势失败时单击手势才有效
*/
singleTapGesture.requireGestureRecognizerToFail(doubleTapGesture)// 获取点击的视图
/*
剪取点击的视图，附带点击手势一起剪取
*/
let tapView:UIView = tapGesture.view!// 获取点击的图片
/*
复制点击的图片，附带点击手势一起复制
*/
let tapImage:UIImage = (tapGesture.view! as! UIImageView).image!


1.3 自定义触摸响应事件处理

• Objective-C

  - (void)tapClick:(UITapGestureRecognizer *)tapGesture {}


• Swift

  func tapClick(tapGesture:UITapGestureRecognizer) {}


2、longPressGesture 长按手势

2.1 longPressGesture 的创建

• Objective-C

  // 实例化长按手势对象
UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self
action:@selector(longPressClick:)];// 向 imageView 添加长按手势
[imageView addGestureRecognizer:longPressGesture];


• Swift

  // 实例化长按手势对象
let longPressGesture:UILongPressGestureRecognizer = UILongPressGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.longPressClick(_:)))// 向 imageView 添加长按手势
imageView?.addGestureRecognizer(longPressGesture)


2.2 longPressGesture 的设置

• Objective-C

  // 获取手势状态
UIGestureRecognizerState state = longPressGesture.state;// 长按手势开始
if (longPressGesture.state == UIGestureRecognizerStateBegan) {}// 长按手势触发结束
if (longPressGesture.state == UIGestureRecognizerStateEnded) {}


• Swift

  // 获取手势状态
let state:UIGestureRecognizerState = longPressGesture.state// 长按手势开始
if longPressGesture.state == UIGestureRecognizerState.Began {}// 长按手势触发结束
if longPressGesture.state == UIGestureRecognizerState.Ended {}


2.3 自定义触摸响应事件处理

• Objective-C

  - (void)longPressClick:(UILongPressGestureRecognizer *)longPressGesture {}


• Swift

  func longPressClick(longPressGesture:UILongPressGestureRecognizer) {}


3、rotationGesture 旋转手势

3.1 rotationGesture 的创建

• Objective-C

  // 实例化旋转手势对象
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self
action:@selector(rotationClick:)];// 向 imageView 添加旋转手势
[imageView addGestureRecognizer:rotationGesture];


• Swift

  // 实例化旋转手势对象
let rotationGesture:UIRotationGestureRecognizer = UIRotationGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.rotationClick(_:)))// 向 imageView 添加旋转手势
imageView?.addGestureRecognizer(rotationGesture)


3.2 rotationGesture 的设置

• Objective-C

  // 获取旋转角度
/*
rotation 获取到的为弧度，1 度 ＝ PI/180 弧度
*/
CGFloat rotation = rotationGesture.rotation * 180 * M_1_PI;// 图片旋转
/*
lastRotation 为之前的角度
*/
imageView.transform = CGAffineTransformMakeRotation(lastRotation + rotationGesture.rotation);// 旋转手势触发结束
if (rotationGesture.state == UIGestureRecognizerStateEnded) {lastRotation += rotationGesture.rotation;
}


• Swift

  // 获取旋转角度
/*
rotation 获取到的为弧度，1 度 ＝ PI/180 弧度
*/
let rotation:CGFloat = rotationGesture.rotation * 180 * CGFloat(M_1_PI)// 图片旋转
/*
lastRotation 为之前的角度
*/
imageView?.transform = CGAffineTransformMakeRotation(lastRotation + rotationGesture.rotation)// 旋转手势触发结束
if rotationGesture.state == UIGestureRecognizerState.Ended {lastRotation += rotationGesture.rotation
}


3.3 自定义触摸响应事件处理

• Objective-C

  // 用模拟器时需按住 option 键
- (void)rotationClick:(UIRotationGestureRecognizer *)rotationGesture {}


• Swift

  // 用模拟器时需按住 option 键
func rotationClick(rotationGesture:UIRotationGestureRecognizer) {}


4、pinchGesture 捏合手势

4.1 pinchGesture 的创建

• Objective-C

  // 实例化捏合手势对象
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self
action:@selector(pinchClick:)];// 向 imageView 添加捏合手势
[imageView addGestureRecognizer:pinchGesture];


• Swift

  // 实例化捏合手势对象
let pinchGesture:UIPinchGestureRecognizer = UIPinchGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.pinchClick(_:)))// 向 imageView 添加捏合手势
imageView?.addGestureRecognizer(pinchGesture)


4.2 pinchGesture 的设置

• Objective-C

  // 获取缩放倍数
CGFloat scale = pinchGesture.scale;// 图片缩放
imageView.transform = CGAffineTransformMakeScale(pinchGesture.scale, pinchGesture.scale);
imageView.bounds = CGRectMake(0, 0, imageView.bounds.size.width * pinchGesture.scale,
imageView.bounds.size.height * pinchGesture.scale);// 还原缩放倍数
[pinchGesture setScale:1];


• Swift

  // 获取缩放倍数
let scale:CGFloat = pinchGesture.scale// 图片缩放
imageView?.transform = CGAffineTransformMakeScale(pinchGesture.scale, pinchGesture.scale)
imageView?.bounds = CGRectMake(0, 0, imageView!.bounds.size.width * pinchGesture.scale,
imageView!.bounds.size.height * pinchGesture.scale)// 还原缩放倍数
pinchGesture.scale = 1


4.3 自定义触摸响应事件处理

• Objective-C

  // 用模拟器时需按住 option 键
- (void)pinchClick:(UIPinchGestureRecognizer *)pinchGesture {}


• Swift

  // 用模拟器时需按住 option 键
func pinchClick(pinchGesture:UIPinchGestureRecognizer) {}


5、panGesture 拖动手势

5.1 panGesture 的创建

• Objective-C

  // 实例化拖拽手势对象
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self
action:@selector(panClick:)];// 向 imageView 添加拖拽手势
[imageView addGestureRecognizer:panGesture];


• Swift

  // 实例化拖拽手势对象
let panGesture:UIPanGestureRecognizer = UIPanGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.panClick(_:)))// 向 imageView 添加拖拽手势
imageView?.addGestureRecognizer(panGesture)


5.2 panGesture 的设置

• Objective-C

  // 获取手势位置
CGPoint currentPoint = [panGesture locationInView:self.view];// 图片移动
imageView.center = currentPoint;


• Swift

  // 获取手势位置
let currentPoint:CGPoint = panGesture.locationInView(self.view)// 图片移动
imageView?.center = currentPoint


5.3 自定义触摸响应事件处理

• Objective-C

  - (void)panClick:(UIPanGestureRecognizer *)panGesture {}


• Swift

  func panClick(panGesture:UIPanGestureRecognizer) {}


6、swipeGesture 滑动手势

6.1 swipeGesture 的创建

• Objective-C

  // 实例化滑动手势对象
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self
action:@selector(swipeClick:)];// 设置滑动方向，默认为 0：向右滑动
swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;// 向 imageView 添加拖拽手势
[imageView addGestureRecognizer:swipeGesture];


• Swift

  // 实例化滑动手势对象
let swipeGesture:UISwipeGestureRecognizer = UISwipeGestureRecognizer(target: self,
action: #selector(UiGestureRecognizer.swipeClick(_:)))// 设置滑动方向，默认为 0：向右滑动
swipeGesture.direction = [.Left, .Right]// 向 imageView 添加拖拽手势
imageView?.addGestureRecognizer(swipeGesture)


6.2 swipeGesture 的设置

• Objective-C

  // 获取滑动方向
UISwipeGestureRecognizerDirection direction = swipeGesture.direction;


• Swift

  // 获取滑动方向
let direction:UISwipeGestureRecognizerDirection = swipeGesture.direction


6.3 自定义触摸响应事件处理

• Objective-C

  - (void)swipeClick:(UISwipeGestureRecognizer *)swipeGesture {}


• Swift

  func swipeClick(swipeGesture:UISwipeGestureRecognizer) {}