IOS 中的手势
IOS中有六种手势，分别是点击、长按、轻扫、选转、捏合、拖拽。
/************************** 点击 **********************************/
-(void)createTarget01{
//打开手势
self.firstImage.userInteractionEnabled = YES;
//创建手势
UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc]init];
//设置属性
//1⃣️设置点击几次才能响应
tap.numberOfTapsRequired = 1;
//2⃣️添加几个手指点击
tap.numberOfTouchesRequired = 1;
//添加手势识别器到view
[self.firstImage addGestureRecognizer:tap];
//设置监听
[tap addTarget:self action:@selector(tapView)];
}
-(void)tapView{ NSLog(@"点击手势有效……");}
```
/************************** 长按 **********************************/
```
-(void)createTarget02{
//创建手势识别器
UILongPressGestureRecognizer *longprss = [[UILongPressGestureRecognizer alloc]init]; //设置属性
//1⃣️设置最少按住几秒
longprss.minimumPressDuration = 1;
//2⃣️y允许的移动范围
longprss.allowableMovement = 50;
[self.button addGestureRecognizer:longprss];
[longprss addTarget: self action:@selector(longTarget)];}
-(void)longTarget{ NSLog(@"长按成功……"); }
```/******************* 3.轻扫手势 **************************//```
-(void)createTaget03{
//设置清扫向上
UISwipeGestureRecognizer *swip1 = [[UISwipeGestureRecognizer alloc]init]; swip1.direction = UISwipeGestureRecognizerDirectionUp;
[swip1 addTarget:self action:@selector(up)];
[self.firstImage addGestureRecognizer:swip1];
//设置清扫向下 UISwipeGestureRecognizer *swip2 = [[UISwipeGestureRecognizer alloc]init];
swip2.direction = UISwipeGestureRecognizerDirectionDown; [swip2 addTarget:self action:@selector(down)]; [self.firstImage addGestureRecognizer:swip2];
//设置清扫向左
UISwipeGestureRecognizer *swip3 = [[UISwipeGestureRecognizer alloc]init];
swip3.direction = UISwipeGestureRecognizerDirectionLeft;
[swip3 addTarget:self action:@selector(left)];
[self.firstImage addGestureRecognizer:swip3];
//设置清扫向右
UISwipeGestureRecognizer *swip4 = [[UISwipeGestureRecognizer alloc]init];
swip4.direction = UISwipeGestureRecognizerDirectionRight;
[swip4 addTarget:self action:@selector(right)];
[self.firstImage addGestureRecognizer:swip4];
}
-(void)up{ NSLog(@"向上滑扫……");}
-(void)down{ NSLog(@"向下滑扫……");}
-(void)left{ NSLog(@"向左滑扫……");}
-(void)right{ NSLog(@"向右滑扫……");}
```/******************* 4.旋转手势 **************************//
```//-(void)createTarget04{
self.thirdImage.userInteractionEnabled = YES;
UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc]init]; //设置代理 rotation.delegate = self;
//添加 [self.thirdImage addGestureRecognizer:rotation];
[rotation addTarget:self action:@selector(rotationTarget:)];
}
-(void)rotationTarget:(UIRotationGestureRecognizer *)gesture{
NSLog(@"旋转了%f",gesture.rotation);
//在转入弧度
self.thirdImage.transform = CGAffineTransformRotate(self.thirdImage.transform,gesture.rotation);
//将旋转弧度清零，（ps:并不是将弧度清零，而是将当前旋转的角度清零）
gesture.rotation = 0;
}
```/************************** 捏合 **********************************/
```-(void)createTarget05{
UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc]init];
//设置代理
pinch.delegate = self;
[self.thirdImage addGestureRecognizer:pinch];
[pinch addTarget:self action:@selector(pinchTarget:)];
}
//捏合事件
-(void)pinchTarget:(UIPinchGestureRecognizer *)pin{
NSLog(@"捏合事件%f",pin.scale);
self.thirdImage.transform = CGAffineTransformScale(self.thirdImage.transform, pin.scale, pin.scale);
}
```/************************** 拖拽 **********************************/
```-(void)createTarget06{
//创建拖拽手势
UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc]init];
//添加到视图
[self.thirdImage addGestureRecognizer:pan];
//添加事件
[pan addTarget:self action:@selector(panView:)];
}
-(void)panView:(UIPanGestureRecognizer *)panG{
//返回值是以手指按下去的点位原点
CGPoint point = [panG translationInView:panG.view];
NSLog(@"拖拽事件 %@",NSStringFromCGPoint(point));
CGPoint temp = self.thirdImage.center;
temp.x += point.x;
temp.y += point.y;
self.thirdImage.center = temp;
//记住
[panG setTranslation:CGPointZero inView:panG.view];
}
