iOS手势识别器

/**   手势的使用   */
1.  点击
几根手指 点击几次  触发手势
- (void)addTap {
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapAction:)];
    
 点击 几次  触发手势
    tap.numberOfTapsRequired = 1;
    
    // 几个手指 点击触发手势
    tap.numberOfTouchesRequired = 2;
    
    tap.delegate = self;
    
    [self.mainImageView addGestureRecognizer:tap];
}
- (void)tapAction:(UITapGestureRecognizer *)tap {
    NSLog(@"%s", __FUNCTION__);
}

2.长按手势

- (void)addLongPress {
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
    
    // 设置长按触发的最小时间
    longPress.minimumPressDuration = 2.0f;
    
    // 用户手指在长按过程中允许移动的距离
    longPress.allowableMovement = 200;
    
    [self.mainImageView addGestureRecognizer:longPress];
    
}
- (void)longPress:(UILongPressGestureRecognizer *)longPress {
长按 longPress.minimumPressDuration 这么长时间之后调用
    if (longPress.state == UIGestureRecognizerStateBegan) {
        NSLog(@"%s", __FUNCTION__);
    }
    
    // 长按结束(抬起手指后)调用
    if (longPress.state == UIGestureRecognizerStateEnded) {
        NSLog(@"111%s", __FUNCTION__);
    }
}

3. 旋转手势, 别忘了复位

- (void)addRotation {
    UIRotationGestureRecognizer *rotation = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(rotation:)];
    
    rotation.delegate = self;
    
    [self.mainImageView addGestureRecognizer:rotation];
    
}
- (void)rotation:(UIRotationGestureRecognizer *)rotation {
    self.mainImageView.transform = CGAffineTransformRotate(self.mainImageView.transform, rotation.rotation);
    
 复位
    rotation.rotation = 0;
}

4. 捏合

- (void)addPinch {
    UIPinchGestureRecognizer *pinch = [[UIPinchGestureRecognizer alloc] initWithTarget:self action:@selector(pinch:)];
    
    // 因为要同时支持多个手势
    pinch.delegate = self;
    
    [self.mainImageView addGestureRecognizer:pinch];
}
- (void)pinch:(UIPinchGestureRecognizer *)pinch {
    self.mainImageView.transform = CGAffineTransformScale(self.mainImageView.transform, pinch.scale, pinch.scale);
    
 复位
    pinch.scale = 1;
}

5. 拖拽

UIPanGestureRecognizer *pan = [[UIPanGestureRecognizeralloc] initWithTarget:selfaction:@selector(panAction:)]; //创建
    [self.imageViewaddGestureRecognizer:pan];// 添加到图片
    [pan release]; //释放
- (void)panAction:(UIPanGestureRecognizer *)pan {
    UIImageView *imageView = (UIImageView *)pan.view; //通过手势找视图
    
    CGPoint point = [pan translationInView:imageView]; //获得手势经过的点
    
    imageView.transform = CGAffineTransformTranslate(imageView.transform, point.x, point.y); //设置移动的位置
    
    [pan setTranslation:CGPointZeroinView:imageView];// 为了防止手势在操作的时候消失
}

6. 轻扫手势

- (void)addSwipe {
    UISwipeGestureRecognizer *swipe = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipe:)];
 向左扫
    swipe.direction = UISwipeGestureRecognizerDirectionLeft;
    
    [self.mainImageView addGestureRecognizer:swipe];
    
}
- (void)swipe:(UISwipeGestureRecognizer *)swipe {
    
    if (swipe.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"%s", __FUNCTION__);
    }
}

默认是不支持多个手势, 当你使用一个手势的时候就会调用

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    return YES;
}

这个触摸点能否触发手势

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    CGPoint currentPoint = [touch locationInView:self.mainImageView];

    if (currentPoint.x < self.mainImageView.bounds.size.width * 0.5) { //  左边 不可以  触发手势
        return NO;
        
    }else{ //  右边 可以  触发手势
        
        return YES;
    }
}