手势操作

视图的形变
tgr.view.transform = CGAffineTransformIdentity;//形变清零

单击手势必须再双击手势识别失败时才识别

//否则一次双击可以同时出发多个手势
[singleTap requireGestureRecognizerToFail:doubleTap];

1.点击手势

UITapGestureRecognizer
//设置点击次数，默认为1
tgr.numberOfTapsRequired = 2;
//设置触摸点数，默认为1
//tgr.numberOfTouchesRequired = 2;

---

2.长按手势UILongPressGestureRecognizer

//设置最小持续时间
lpgr.minimumPressDuration = 1;

---

3.滑动手势UIPanGestureRecognizer

注：view上label的移动操作

- (void)panGestureHandle:(UIPanGestureRecognizer *)pgr
{
    switch (pgr.state) {
        case UIGestureRecognizerStateBegan:
        case UIGestureRecognizerStateChanged:
            //NSLog(@"滑动手势识别成功");
        {
            UIView *view = pgr.view;
            CGPoint offset = [pgr translationInView:self.view];
    //用形变量改变位置，在上一次形变量基础之上
            view.transform = CGAffineTransformTranslate(view.transform, offset.x, offset.y);
            **//因为滑动手势效果会累加，所以每次需要清零
            [pgr setTranslation:CGPointZero inView:self.view];**
        }
            break;
        case UIGestureRecognizerStateEnded:
            NSLog(@"滑动手势识别结束");
            break;
        default:
            break;
    }
}

4.捏合手势UIPinchGestureRecognizer

 -(void)pinchGestureHandle:(UIPinchGestureRecognizer *)pgr
{
    switch (pgr.state) {
        case UIGestureRecognizerStateBegan:
        case UIGestureRecognizerStateChanged:
        {
            UIView *view = pgr.view;
            view.transform = CGAffineTransformScale(view.transform, pgr.scale, pgr.scale);
            //缩放比例会累加，所以需要重新复位
            pgr.scale = 1;
        }
            break;
        case UIGestureRecognizerStateEnded:
            NSLog(@"捏合手势结束");
            break;
        default:
            break;
    }    
}

5.旋转手势UIRotationGestureRecognizer

pragma mark - 旋转手势

- (void)rotationGestureHandle:(UIRotationGestureRecognizer *)rgr
{
    switch (rgr.state) {
        case UIGestureRecognizerStateBegan:
        case UIGestureRecognizerStateChanged:
        {
            UIView *view = rgr.view;
            view.transform = CGAffineTransformRotate(view.transform, rgr.rotation);
            //因为旋转弧度会累加，所以需要清零
            rgr.rotation = 0;
        }
            break;

        case UIGestureRecognizerStateEnded:
            NSLog(@"旋转结束");
            break;
        default:
            break;
    }
}

//设置代理，出现手势冲突时可以加以干涉
rgr.delegate = self;

pragma mark - 代理方法

//注：此代理方法解决手势冲突

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    //如果多个手势操作一个视图，返回yes识别
    if (gestureRecognizer.view == otherGestureRecognizer.view) {
        return YES;
    }
    return NO;
}

6.有方向滑动UISwipeGestureRecognizer

//触动方法
注：下面代码实现单方向快速滑过，view上label朝划过的方向移动一定距离，需要设置sgr.direction

- (void)swipeGestureHandle:(UISwipeGestureRecognizer *)sgr
{
#define MOVE_STEP  100
    UIView *view = sgr.view;

    CGPoint offset = CGPointZero;

    switch (sgr.direction) {
        case UISwipeGestureRecognizerDirectionDown:
            offset.y += MOVE_STEP;
            break;
        case UISwipeGestureRecognizerDirectionUp:
            offset.y -= MOVE_STEP;
            break;
        case UISwipeGestureRecognizerDirectionLeft:
            offset.x -= MOVE_STEP;
            break;
        case UISwipeGestureRecognizerDirectionRight:
            offset.x += MOVE_STEP;
            break;
        default:
            break;
    }
    view.transform = CGAffineTransformTranslate(view.transform, offset.x, offset.y);
}

7.摇晃事件

说明：实现类似微信摇一摇功能，声音、动画 并未实现代理方法，使用晃动事件接口监听晃动事件
注：播放短音乐，需导入AudioToolbox.framework系统包，导入#import
(AudioToolbox/AudioToolbox.h)

- (void)playSoundWithName:(NSString *)soundName
{
    NSArray *array = [soundName componentsSeparatedByString:@"."];
    NSString *path = [[NSBundle mainBundle] pathForResource:array[0] ofType:array[1]];
    NSURL *url = [NSURL URLWithString:path];
    SystemSoundID soundID;
    AudioServicesCreateSystemSoundID((CFURLRef)url, &soundID);
    AudioServicesPlayAlertSound(soundID);
}

#pragma mark - 晃动事件接口
//晃动开始
- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    [super motionBegan:motion withEvent:event];
    //NSLog(@"晃动开始");
    //添加动画
    [self createAnimation];
    //添加音乐
    [self playSoundWithName:@"shake_sound_male.wav"];
}
//晃动结束
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"晃动结束");
}
//滑动被取消
- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
{
    NSLog(@"滑动被取消");
}