UIGestureRecognizer(手势识别器)

//
//  ViewController.h
//  UIGestureRecognizer
//
//  Created by Cyric Tsao on 15-5-14.
//  Copyright (c) 2015年Cyric Tsao. All rights reserved.
//

#import<UIKit/UIKit.h>

@interfaceViewController : UIViewController
{   

    UIView *_demoView;

    CGAffineTransform _transform;
}

@end

//
//  ViewController.m
//  UIGestureRecognizer
//
//  Created by Cyric Tsao on 15-5-14.
//  Copyright (c) 2015年Cyric Tsao. All rights reserved.
//

#import"ViewController.h"

@interfaceViewController()

@end

@implementationViewController

- (void)viewDidLoad {
    [superviewDidLoad];

    //创建一个demoView视图
    _demoView = [[UIViewalloc]initWithFrame:CGRectMake(100,100,165,165)];
    _demoView.backgroundColor= [UIColorpurpleColor];
    [self.viewaddSubview:_demoView];
   

    //----------UIGestureRecognizer(手势识别器)----------
    //手势识别器类,用于检测用户使用设备时所用的手势.它是一个抽象类,定义了所有手势的基本行为.
    //以下是UIGestureRecognizer子类,用于处理具体的用户手势行为

   
    //----------1.UITapGestureRecognizer(轻击,点击手势)----------
    //1.一只手指单击
    //默认就是一个手指点击一次
    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(singleTapAction:)];
    //设置手指点击次数(单击或者双击),默认是1
    singleTap.numberOfTapsRequired= 1;
    //设置点击的手指个数(一根手指或者两根手指),默认是1
    singleTap.numberOfTouchesRequired= 1;
    //给_demoView视图添加一个单击手势
    [_demoViewaddGestureRecognizer:singleTap];
   
    //2.一只手指双击
    UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(doubleTapAction:)];
    //设置手指点击次数(单击或者双击),默认是1
    doubleTap.numberOfTapsRequired= 2;
    //设置点击的手指个数(一根手指或者两根手指),默认是1
    doubleTap.numberOfTouchesRequired= 1;
    //给_demoView视图添加一个双击手势
    [_demoViewaddGestureRecognizer:doubleTap];
   
    //3.绑定单击和双击事件(区别单击和双击)
    [singleTap requireGestureRecognizerToFail:doubleTap];

    //这行很关键,意思是只有当没有检测到doubleTap(双击手势)或者检测doubleTap(双击手势)失败,singleTap(单击手势)才有效

   
    //----------2.UIPanGestureRecognizer(平移,拖拽手势)----------
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc]initWithTarget:selfaction:@selector(panAction:)];
    //给_demoView视图添加一个平移手势
    [_demoViewaddGestureRecognizer:pan];
   
    //----------3.UISwipeGestureRecognizer(轻扫,滑动手势)----------
    //同一个手势只能指定一个方向,不能同时指定多个方向,要指定多个方向,必须用多个手势
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizeralloc]initWithTarget:selfaction:@selector(swipeAction:)];
    //轻扫的方向(设置向左轻扫响应事件)
    swipe.direction= UISwipeGestureRecognizerDirectionLeft;
    //给视图添加一个轻扫手势
    [self.viewaddGestureRecognizer:swipe];
   
   
    //----------4.UIPinchGestureRecognizer(捏合手势)----------
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizeralloc]initWithTarget:selfaction:@selector(pinchAction:)];
    //给视图添加一个捏合手势
    [self.viewaddGestureRecognizer:pinch];
   
   
    //----------5.UIRotationGestureRecognizer(旋转手势)----------
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizeralloc]initWithTarget:selfaction:@selector(rotationAction:)];
    //给视图添加一个旋转手势
    [self.viewaddGestureRecognizer:rotation];
   
   
    //----------6.UILongPressGestureRecognizer(长按手势)----------
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(longPressAction:)];
    longPress.minimumPressDuration= 2;
    //给视图添加一个长按手势
    [self.viewaddGestureRecognizer:longPress];

   
}

#pragma mark -1.UITapGestureRecognizer轻击事件
//单击事件
- (void)singleTapAction:(UITapGestureRecognizer*)tap
{
    NSLog(@"单击");
}
//双击事件
- (void)doubleTapAction:(UITapGestureRecognizer*)tap
{
    NSLog(@"双击");
}

#pragma mark -2.UIPanGestureRecognizer平移手势
- (void)panAction:(UIPanGestureRecognizer*)pan
{
    //demoView视图的中心= 手指对象在视图上点击的位置
    _demoView.center= [pan locationInView:self.view];
   
    //等价的
    //CGPoint point = [pan locationInView:self.view];
    //_demoView.center = point;
   
    //NSLog(@"移动了");
}

#pragma mark -3.UISwipeGestureRecognizer轻扫手势
- (void)swipeAction:(UISwipeGestureRecognizer*)swipe
{
    NSLog(@"向左轻扫了");
}

#pragma mark -4.UIPinchGestureRecognizer捏合手势
- (void)pinchAction:(UIPinchGestureRecognizer*)pinch
{
    if (pinch.state== UIGestureRecognizerStateBegan) {
        //如果捏合手势的状态是开始...
       
        _transform = _demoView.transform;
        //...记录开始时_demoView视图的transform属性
       
    }else{
        //transform:改变,变换,改变...的形状
        _demoView.transform= CGAffineTransformScale(_transform, pinch.scale, pinch.scale);
        //让_demoView的transform随着捏合手势的比例变化而在原来的基础上缩放
      
        /*
         scale属性:
         可以理解为两手指之间的距离,其实是个比例,相对距离,不是绝对距离
         以刚开始的两个手指对应的两个point的之间的距离为标准,此时scale = 1
         若两手指之间距离减小,则scale不断变小,当两指重合,则变为0
         若两手指之间距离变大,则scale不断增大,没有上限,看屏幕多大
        */
    }
}

#pragma mark -5.UIRotationGestureRecognizer旋转手势
- (void)rotationAction:(UIRotationGestureRecognizer*)rota
{
    if (rota.state== UIGestureRecognizerStateBegan) {
        //如果旋转手势的状态是开始...
       
        _transform = _demoView.transform;
        //...记录开始时_demoView视图的transform属性
       
    }else{
       
        _demoView.transform= CGAffineTransformRotate(_transform, rota.rotation);
        //让_demoView的transform随着旋转手势的比例变化而在原来的基础上旋转
       
        /*
         rotation属性:
         可以理解为两手指之间的旋转的角度,其实是个比例,相对角度,不是绝对角度
         以刚开始的两个手指对应的两个point的之间的那条直线为标准,此时rotation = 1
         向顺时针旋转,则rotation为正数且不断变大,当旋转360度时,rotation大概为6左右,如果继续顺时针旋转,则角度会不断增加,两圈为12左右,此时若逆时针旋转,角度则不断变小
         向逆时针旋转,则rotation为负数且不断变小,当旋转360度时,rotation大概为-6左右
        */
    }
}

#pragma mark -6.UILongPressGestureRecognizer长按手势
//长按手势会执行多次
- (void)longPressAction:(UILongPressGestureRecognizer*)lPress
{
    if (lPress.state== UIGestureRecognizerStateBegan) {
        NSLog(@"长按手势执行了");
    }
   
    /*
     typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
     UIGestureRecognizerStatePossible,   0//是初始状态，表明识别过程在执行当中(默认的状态)
     UIGestureRecognizerStateBegan,      1//开始
     UIGestureRecognizerStateChanged,    2//改变
     UIGestureRecognizerStateEnded,      3//结束
     UIGestureRecognizerStateCancelled,  4//取消,终止
     UIGestureRecognizerStateFailed,     5//失败
     UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded  //识别器已识别到的手势= 结束
     };

    */
    NSLog(@"%ld",lPress.state);
}

#pragma mark -7.摇晃手势
//摇晃开始
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent*)event
{
    NSLog(@"摇晃手势开始了");
}
//摇晃结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent*)event
{
    NSLog(@"摇晃手势结束了");
}

#pragma mark -8.重力加速计(扩展知识  暂无)

@end