总共有六种手势识别:轻击手势(TapGestureRecognizer),轻扫手势 (SwipeGestureRecognizer), 长按手势(LongPressGestureRecognizer), 拖动手势(PanGestureRecognizer), 捏合手势(PinchGestureRecognizer),旋转手势(RotationGestureRecognizer);
其实这些手势用touche事件完全可以实现,苹果就是把常用的触摸事件封装成手势,来提供给用户。读者完全可以用TouchesMoved来写拖动手势等
一,用storyboard给控件添加手势识别
1.用storyboard添加手势识别,和添加一个Button的步骤一样,首先我们得找到相应的手势,把手势识别的控件拖到我们要添加手势的控件中,截图如下:
2.给我们拖出的手势添加回调事件,和给Button回调事件没啥区别的,在回调方法中添加要实现的业务逻辑即可,截图如下:
二,纯代码添加手势识别
用storyboard可以大大简化我们的操作,不过纯代码的方式还是要会的,就像要Dreamwear编辑网页一样(当然啦,storyboard的拖拽功能要比Dreamwear的拖拽强大的多),用纯代码敲出来的更为灵活,更加便 于维护。不过用storyboard可以减少我们的工作量,这两个要配合着使用才能大大的提高我们的开发效率。个人感觉用storyboard把框架搭起 来(Controller间的关系),一下小的东西还是用纯代码敲出来更好一些。下面就给出如何给我们的控件用纯代码的方式来添加手势识别。
1.轻击手势(TapGestureRecognizer)的添加
初始化代码TapGestureRecongnizer的代码如下:
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//新建tap手势
UITapGestureRecognizer *tapGesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGesture:)]; //设置点击次数和点击手指数 tapGesture.numberOfTapsRequired = 1; //点击次数 tapGesture.numberOfTouchesRequired = 1; //点击手指数 [self.view addGestureRecognizer:tapGesture]; |
在回调方法中添加相应的业务逻辑:
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//轻击手势触发方法
-(void)tapGesture:(id)sender
{
//轻击后要做的事情
}
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2.长按手势(LongPressGestureRecognizer)
初始化代码:
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//添加长摁手势
UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressGesture:)]; //设置长按时间 longPressGesture.minimumPressDuration = 0.5; //(2秒) [self.view addGestureRecognizer:longPressGesture]; |
在对应的回调方法中添加相应的方法(当手势开始时执行):
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//常摁手势触发方法
-(void)longPressGesture:(id)sender
{
UILongPressGestureRecognizer *longPress = sender; if (longPress.state == UIGestureRecognizerStateBegan) { UIAlertView *alter = [[UIAlertView alloc] initWithTitle:@ “提示” message:@ “长按触发” delegate:nil cancelButtonTitle:@ “取消” otherButtonTitles: nil]; [alter show]; }
}
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代码说明:手势的常用状态如下
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开始:UIGestureRecognizerStateBegan
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改变:UIGestureRecognizerStateChanged
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结束:UIGestureRecognizerStateEnded
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取消:UIGestureRecognizerStateCancelled
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失败:UIGestureRecognizerStateFailed
3.轻扫手势(SwipeGestureRecognizer)
在初始化轻扫手势的时候得指定轻扫的方向,上下左右。 如果要要添加多个轻扫方向,就得添加多个轻扫手势,不过回调的是同一个方法。
添加轻扫手势,一个向左一个向右,代码如下:
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//添加轻扫手势
UISwipeGestureRecognizer *swipeGesture = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)]; //设置轻扫的方向 swipeGesture.direction = UISwipeGestureRecognizerDirectionRight; //默认向右 [self.view addGestureRecognizer:swipeGesture]; //添加轻扫手势 UISwipeGestureRecognizer *swipeGestureLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeGesture:)]; //设置轻扫的方向 swipeGestureLeft.direction = UISwipeGestureRecognizerDirectionLeft; //默认向右 [self.view addGestureRecognizer:swipeGestureLeft]; |
回调方法如下:
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//轻扫手势触发方法
-(void)swipeGesture:(id)sender
{
UISwipeGestureRecognizer *swipe = sender; if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) { //向左轻扫做的事情 } if (swipe.direction == UISwipeGestureRecognizerDirectionRight) { //向右轻扫做的事情 }
}
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4.捏合手势(PinchGestureRecognizer)
捏合手势初始化
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//添加捏合手势
UIPinchGestureRecognizer *pinchGesture = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinchGesture:)];
[self.view addGestureRecognizer:pinchGesture];
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捏合手势要触发的方法(放大或者缩小图片):
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////捏合手势触发方法
-(void) pinchGesture:(id)sender
{
UIPinchGestureRecognizer *gesture = sender; //手势改变时 if (gesture.state == UIGestureRecognizerStateChanged) { //捏合手势中scale属性记录的缩放比例 _imageView.transform = CGAffineTransformMakeScale(gesture.scale, gesture.scale); } //结束后恢复 if (gesture.state==UIGestureRecognizerStateEnded) { [UIView animateWithDuration:0.5 animations:^{ _imageView.transform = CGAffineTransformIdentity; //取消一切形变 }]; }
}
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5.拖动手势(PanGestureRecognizer)
拖动手势的初始化
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//添加拖动手势
UIPanGestureRecognizer *panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(panGesture:)];
[self.view addGestureRecognizer:panGesture];
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拖动手势要做的方法(通过translationInView获取移动的点,和TouchesMoved方法类似)
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//拖动手势
-(void) panGesture:(id)sender
{
UIPanGestureRecognizer *panGesture = sender; CGPoint movePoint = [panGesture translationInView:self.view]; //做你想做的事儿
}
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6.旋转手势(RotationGestureRecognizer)
旋转手势的初始化
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//添加旋转手势
UIRotationGestureRecognizer *rotationGesture = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotationGesture:)];
[self.view addGestureRecognizer:rotationGesture];
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旋转手势调用的方法:
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//旋转手势
-(void)rotationGesture:(id)sender
{
UIRotationGestureRecognizer *gesture = sender; if (gesture.state==UIGestureRecognizerStateChanged) { _imageView.transform=CGAffineTransformMakeRotation(gesture.rotation); } if (gesture.state==UIGestureRecognizerStateEnded) { [UIView animateWithDuration:1 animations:^{ _imageView.transform=CGAffineTransformIdentity; //取消形变 }]; }
}
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其他链接
iOS-触摸事件、手势识别、摇晃事件、耳机线控
原创文章,作者:奋斗,如若转载,请注明出处:https://blog.ytso.com/tech/app/6053.html