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手势的使用(UIGestureRecognizer)

手势的使用(UIGestureRecognizer)

作者: CoderZNB | 来源:发表于2016-09-09 12:55 被阅读320次

    注意点 : 手势的优先级比较高,如果给tableView添加手势,那么会造成tableView无法滚动,是不是很慌,不用怕,只需要给手势设置代理并且让代理实现代理方法就行

    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
    

    一.轻扫手势

    • 轻扫手势:UISwipeGestureRecognizer
    • 轻扫手势是有方向的:UISwipeGestureRecognizerDirection

    typedef NS_OPTIONS(NSUInteger, UISwipeGestureRecognizerDirection) {
    UISwipeGestureRecognizerDirectionRight = 1 << 0,
    UISwipeGestureRecognizerDirectionLeft = 1 << 1,
    UISwipeGestureRecognizerDirectionUp = 1 << 2,
    UISwipeGestureRecognizerDirectionDown = 1 << 3
    };

    
    ####手势的创建
    
    ```objc
    // 默认方向是往右
        UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    
    • 默认状态下方向是从左向右:UISwipeGestureRecognizerDirectionRight
    • 如果想给一个View添加多个轻扫手势,必须创建多个轻扫手势,并且指定手势的方向,一个手势只能有一个方向;但是默认情况下,是只能接收一个手势的,所以我们必须设置手势的代理,实现代理方法,允许View接收多个手势,如下
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
       swipe.direction = UISwipeGestureRecognizerDirectionUp;
    
       swipe.delegate = self;
    
       [self.tableView addGestureRecognizer:swipe];
    
       UISwipeGestureRecognizer *swipeDown = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
    
       swipeDown.direction = UISwipeGestureRecognizerDirectionDown;
       swipeDown.delegate = self;
       [self.tableView addGestureRecognizer:swipeDown];
    
    • 实现代理方法,接收多个手势
    // 是否允许支持多个手势,默认是不支持:NO
    - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
    {
        return YES;
    }
    
    • 实现手势的方法
    - (void)swipe:(UISwipeGestureRecognizer *)swipe {
    
        if (swipe.direction == UISwipeGestureRecognizerDirectionDown) {
            NSLog(@"向下滚动");
            [UIView animateWithDuration:0.25 animations:^{
                self.navigationController.navigationBar.znb_y = 20;
            }];
        }else if (swipe.direction == UISwipeGestureRecognizerDirectionUp) {
            NSLog(@"上滚");
    
            [UIView animateWithDuration:0.25 animations:^{
    
                self.navigationController.navigationBar.znb_y = - 64;
            }];
        }
    }
    

    二.长按手势

    注意点:长按手势是有状态的 默认会触发两次

    typedef NS_ENUM(NSInteger, UIGestureRecognizerState) {
    UIGestureRecognizerStatePossible,
    UIGestureRecognizerStateBegan,
    UIGestureRecognizerStateChanged,
    UIGestureRecognizerStateEnded,
    UIGestureRecognizerStateCancelled,
    UIGestureRecognizerStateFailed,
    UIGestureRecognizerStateRecognized = UIGestureRecognizerStateEnded
    };
    

    手势的创建

    #pragma mark - 添加长按手势
    
    - (void)setupLongPress {
    
        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    
        // 设置代理,实现代理方法,让tableView可以就收手势实现手势的方法
        longPress.delegate = self;
    
        [self.tableView addGestureRecognizer:longPress];
    }
    // 实现长按手势的方法
    - (void)longPress:(UILongPressGestureRecognizer *)longPress {
    
        if (longPress.state == UIGestureRecognizerStateBegan) {
            NSLog(@"UIGestureRecognizerStateBegan");
        }else if (longPress.state == UIGestureRecognizerStateEnded) {
            NSLog(@"UIGestureRecognizerStateEnded");
    
    //        self.navigationController.navigationBarHidden = !self.navigationController.navigationBarHidden;
            [UIView animateWithDuration:0.25 animations:^{
    
                self.navigationController.navigationBar.znb_y = self.navigationController.navigationBar.znb_y == 0 ? - 64 : 20;
            }];
        }
    }```
    
    ##三.旋转手势
    >注意点:旋转手势中,旋转角度都是相对于最开始的位置的,结合例子,加深理解
    
    ####创建手势 and 实现手势方法
    ```objc
    #pragma mark - 旋转手势
    - (void)setUpRotation
    {
        UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
        rotation.delegate = self;
        [self.imageView addGestureRecognizer:rotation];
    }
    
    // 默认传递的旋转的角度都是相对于最开始的位置
    - (void)rotation:(UIRotationGestureRecognizer *)rotation
    {
        // 相对于上次的角度 CGAffineTransformRotate
        // 相对于最开始的位置的旋转角度 CGAffineTransformMakeRotation
        self.imageView.transform = CGAffineTransformRotate(self.imageView.transform, rotation.rotation);
    
        // 复位
        rotation.rotation = 0;
    
        // 获取手势旋转的角度
        NSLog(@"%f",rotation.rotation);
    }
    

    四.捏合手势

    创建手势 and 实现手势方法

    #pragma mark - 捏合
    - (void)setUpPinch
    {
        UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
        pinch.delegate = self;
        [self.imageView addGestureRecognizer:pinch];
    }
    
    - (void)pinch:(UIPinchGestureRecognizer *)pinch
    {
        self.imageView.transform = CGAffineTransformScale(self.imageView.transform, pinch.scale, pinch.scale);
    
        // 复位
    
        pinch.scale = 1;
    }
    
    

    五.拖拽手势

    创建手势 and 实现手势方法

    
    #pragma mark - 拖拽
    - (void)setUpPan
    {
        UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(pan:)];
    
    
        [self.imageView addGestureRecognizer:pan];
    }
    
    - (void)pan:(UIPanGestureRecognizer *)pan
    {
        // 获取手势的触摸点
       // CGPoint curP = [pan locationInView:self.imageView];
    
        // 移动视图
        // 获取手势的移动,也是相对于最开始的位置
        CGPoint transP = [pan translationInView:self.imageView];
    
        self.imageView.transform = CGAffineTransformTranslate(self.imageView.transform, transP.x, transP.y);
    
        // 复位
        [pan setTranslation:CGPointZero inView:self.imageView];
    
      //  NSLog(@"%@",NSStringFromCGPoint(curP));
    }
    
    

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