IOS 手势操作详解及实例总结篇
iOS手势操作总结
手势操作种类
- UITapGestureRecognizer:敲击，点击
- UILongPressGestureRecognizer:长按
- UIPinchGestureRecognizer:缩放
- UIRotationGestureRecognizer:旋转
- UISwipeGestureRecongizer:轻扫
- UIPanGestureRecognizer:拖拽
手势操作的代理方法(UIGestureRecognizerDelegate)
手势可能发生的条件，返回NO可以阻止此手势的发生或者此手势不产生任何效果
-(BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer*)gestureRecognizer;
是否允许多个手势同时发生
-(BOOL)gestureRecognizer:(UIGestureRecognizer*) gestureRecognizershouldRecognizeSimultaneouslyWithGestureRecognizer: (UIGestureRecognizer*)otherGestureRecognizer;
UITapGestureRecognier敲击，点击手势
- 设置属性numberOfTapsRequired可以指定需要几根手指才能触发事件
- numberOfTouchesRequired：可以设置需要敲击几次触发事件
UITapGestureRecognizer*tap=[[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(tap:)]; //设置代理 tap.delegate=self; //设置点击次数触发手势事件 tap.numberOfTapsRequired=1; //设置需要点击的手指数 tap.numberOfTouchesRequired=1; [self.imageaddGestureRecognizer:tap];
UILongPressGestureRecongnizer长按
- minimumPressDuration设置长按的最小间隔时间，也就是说按下开始和手指离开时的中间间隔，如果小于这个值则不会被认为是长按操作
- allowableMovement：长按过程中是否允许移动
UILongPressGestureRecognizer*longPress=[[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(longPress:)]; //代理 longPress.delegate=self; //设置最小间隔时间,手指按下与离开间隔时间 longPress.minimumPressDuration=1.0; //按下过程中允许移动的像素 longPress.allowableMovement=30; [self.imageaddGestureRecognizer:longPress];
UIPinchGestureRecognizer缩放手势
scale:设置缩放比例，相对于原来大小
UIPinchGestureRecognizer*pinch=[[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(pinch:)]; //代理 pinch.delegate=self; //设置缩放比例 pinch.scale=1.2; [self.imageaddGestureRecognizer:pinch];
UIRotationGestureRecognizer旋转手势
rotation:旋转弧度，要保证每次都在上一次位置开始旋转，而不是回归初始位置，必须要在动作方法里将此值清零
-(void)setupRotation
{
UIRotationGestureRecognizer*rotation=[[UIRotationGestureRecognizeralloc]initWithTarget:selfaction:@selector(rotation:)];
//设置代理
rotation.delegate=self;
[self.imageaddGestureRecognizer:rotation];
}
-(void)rotation:(UIRotationGestureRecognizer*)rotation
{
//旋转角度
CGFloatradian=rotation.rotation;
self.image.transform=CGAffineTransformRotate(self.image.transform,radian);
//复位，保证每次都是在上一次位置开始转，而不是每次都回归初始位置再转
rotation.rotation=0;
}
UISwipeGestureRecognizer轻扫,手指按下然后在屏幕上滑动
轻扫分四个方向（上下左右），并且如果要在一个控件上同时添加一个以上的轻扫动作，必须对每个动作添加一个对象。也就是说每个方向的动作对应一个对象。
direction:指定轻扫动作的方向
typedefNS_OPTIONS(NSUInteger,UISwipeGestureRecognizerDirection){
UISwipeGestureRecognizerDirectionRight=1<<0,//从左向右
UISwipeGestureRecognizerDirectionLeft=1<<1,//从右向左
UISwipeGestureRecognizerDirectionUp=1<<2,//从下往上
UISwipeGestureRecognizerDirectionDown=1<<3//从上往下
};
UISwipeGestureRecognizer*swipeUp=[[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(swipe:)]; //设置代理 swipeUp.delegate=self; //修改方向,从下往上 swipeUp.direction=UISwipeGestureRecognizerDirectionUp; [self.imageaddGestureRecognizer:swipeUp]; //添加其他方向手势 UISwipeGestureRecognizer*swipeDown=[[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(swipe:)]; //修改方向,从下往上 swipeDown.direction=UISwipeGestureRecognizerDirectionDown; [self.imageaddGestureRecognizer:swipeDown];
UIPanGestureRecognizer拖拽，按下拖动控件操作
注意点：手势的触摸点locationInView和手势的移动点translationInView是不一样的，前者是用locationInView取得是指手指在当前控件中的坐标，后者表示相对于父view的rect
UIPanGestureRecognizer*pan=[[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(pan:)]; //设置代理 pan.delegate=self; [self.imageaddGestureRecognizer:pan];
//手势的触摸点 //CGPointp=[panlocationInView:self.image]; //手势的移动点(每次移动的位移点) CGPointtransP=[pantranslationInView:self.image]; NSLog(@"%f,%f",transP.x,transP.y); self.image.transform=CGAffineTransformTranslate(self.image.transform,transP.x,transP.y); //复位 [pansetTranslation:CGPointZeroinView:self.image];
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