UIGestureRecognizer手势使用

妖狐艹你老母 2022-08-11 16:48 226阅读 0赞

手势识别器

.能够为系统提供的视图对象添加触摸事件的响应方法(UIView,UILabel,UIImageView);

.内部封装了手势识别的过程,我们只需要把中心放在手势识别之后的对用操作上.

UIGestureRecognizer是手势识别器的一个抽象的基类,值提供手势识别器基本的功能.使用时使用具体的子类.

首先创建一个视图

UIView \*redView = \[\[UIViewalloc\] initWithFrame:\[\[UIScreenmainScreen\]bounds\]\];

redView.backgroundColor = \[UIColororangeColor\];

\[self.view addSubview:redView\];

\[redView release\];

1.轻拍手势

UITapGestureRecognizer \*tapGesture = \[\[UITapGestureRecognizer alloc\] initWithTarget:self action:@selector(handleTapGesture:)\];

//设置轻拍的次数

tapGesture.numberOfTapsRequired = 2;

//设值轻拍是需要的手指个数

tapGesture.numberOfTouchesRequired =2;

//给视图添加轻拍手势

\[redView addGestureRecognizer:tapGesture\];

//切记释放

\[tapGesture release\];

2.长按手势

UILongPressGestureRecognizer

长按手势是连续的。手势开始（UIGestureRecognizerStateBegan）时，允许手指（numberOfTouchesRequired）的数量已按指定期间内（minimumPressDuration）和触摸不超越运动（allowableMovement）的允许范围内。该手势识别过渡到状态改变时手指移动，并结束（UIGestureRecognizerStateEnded）当任一手指被取消。

属性

*     minimumPressDuration  property     触摸的时间长短
 *     numberOfTouchesRequired  property  允许手指的触摸的次数
 *     numberOfTapsRequired  property    允许手指的数量
 *     allowableMovement  property   触摸期间是否移动UILongPressGestureRecognizer \*longPressGesture = \[\[UILongPressGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handeleLongPressGesture:)\];    
 *      longPressGesture.minimumPressDuration =0.5;
    
        longPressGesture.numberOfTapsRequired =2;
    
        \[redView addGestureRecognizer:longPressGesture\];
    
        \[longPressGesture  release\];

\- (void)handeleLongPressGesture:(UILongPressGestureRecognizer \*)longPressGesture\{

//判断它的长按时间内触发

if (UIGestureRecognizerStateBegan == longPressGesture.state) \{

NSLog(@"呵呵呵");

3.轻扫手势(轻划手势)

UISwipeGestureRecognizer \*swipGesture = \[\[UISwipeGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handleSwip:)\];

\[redView addGestureRecognizer:swipGesture\];

//设置轻扫方向,让左右方向都存在

//只要枚举值中有左移运算符,代表枚举值可以通过按位或,让多个枚举值同事存在.

//警告:上下和左右在一个手势识别器中不能同时存在

//如果想让上下左右四个方法都有,那只能创建两个轻扫手势对象,一个支持上下,一个支持左右.

swipGesture.direction =UISwipeGestureRecognizerDirectionLeft | UISwipeGestureRecognizerDirectionRight;

swipGesture.direction =UISwipeGestureRecognizerDirectionDown | UISwipeGestureRecognizerDirectionUp;

//创建手势后释放内存

\[swipGesture release\];

4.平移手势

UIPanGestureRecognizer \*panGesture = \[\[UIPanGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handlePanGesture:)\];

\[redView addGestureRecognizer:panGesture\];//添加到视图上

\[panGesture release\];

//处理平移手势

\- (void)handlePanGesture:(UIPanGestureRecognizer \*)panGesture\{

//获取平移之前后的改变量

CGPoint point = \[panGesture translationInView:panGesture.view\];

panGesture.view.transform =CGAffineTransformTranslate(panGesture.view.transform, point.x, point.y);

\[panGesture  setTranslation:CGPointZeroinView:panGesture.view\];

5.捏合手势

UIPinchGestureRecognizer \*pinchGesture = \[\[UIPinchGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handlePinch:)\];

\[redView addGestureRecognizer:pinchGesture\];

\[pinchGesture release\];

处理捏合手势

\- (void)handlePinch:(UIPinchGestureRecognizer \*)pinch\{

pinch.view.transform =CGAffineTransformScale(pinch.view.transform, pinch.scale, pinch.scale);

//将之前的变化比例置1

pinch.scale =1;

6.旋转手势

UIRotationGestureRecognizer \*rotationGesture = \[\[UIRotationGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handleRotation:)\];

\[redView addGestureRecognizer:rotationGesture\];

\[rotationGesture  release\];

处理旋转手势

\- (void)handleRotation:(UIRotationGestureRecognizer \*)roration\{

roration.view.transform =CGAffineTransformRotate(roration.view.transform, roration.rotation);//roration.roration获取改变的角度

//将之前改变的角度rotation清0

roration.rotation =0;

7.屏幕边缘手势

UIScreenEdgePanGestureRecognizer \*screenPanGesture = \[\[UIScreenEdgePanGestureRecognizeralloc\] initWithTarget:selfaction:@selector(handleScreen:)\];

\[redView addGestureRecognizer:screenPanGesture\];

//设屏幕边缘

screenPanGesture.edges = UIRectEdgeLeft;

//几个方向枚举值

typedefNS\_OPTIONS(NSUInteger, UIRectEdge) \{

UIRectEdgeNone   =0,

UIRectEdgeTop    =1 << 0,

UIRectEdgeLeft   =1 << 1,

UIRectEdgeBottom =1 << 2,

UIRectEdgeRight  =1 << 3,

UIRectEdgeAll    =UIRectEdgeTop | UIRectEdgeLeft | UIRectEdgeBottom | UIRectEdgeRight

\}NS\_ENUM\_AVAILABLE\_IOS(7\_0);