需要应用UIRotationGestureRecognizer，然后是UILongPressGestureRecongnizer

Question

在一个视图上应用UILongPressGestureRecongnizer，请检查下面的代码以供参考。

@interface ViewController ()
{
     UIRotationGestureRecognizer *rotationGestureRecognizer6;
}


- (void)viewDidLoad {

    //--------Added LongPress Gesture----------//
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]
                                               initWithTarget:self
                                               action:@selector(handleLongPress:)];
    longPress.minimumPressDuration = 2.0;
    [view6 addGestureRecognizer:longPress];

    rotationGestureRecognizer6 = [[UIRotationGestureRecognizer alloc] initWithTarget:self action:@selector(handleRotationWithGestureRecognizer:)];
}

#pragma mark - UILongPressGesture Handler Method

-(void)handleLongPress:(UILongPressGestureRecognizer *)sender {

    if (sender.state == UIGestureRecognizerStateEnded) {
        NSLog(@"UIGestureRecognizerStateEnded");
    }
    else if (sender.state == UIGestureRecognizerStateBegan){
        NSLog(@"UIGestureRecognizerStateBegan.");
        [view6 addGestureRecognizer:rotationGestureRecognizer6];
    }
}

#pragma mark - UIRotationGesture Handler Method

-(void)handleRotationWithGestureRecognizer:(UIRotationGestureRecognizer *)recognizer {

    UIView *view = [recognizer view];
    [view setTransform:CGAffineTransformRotate([view transform], [recognizer rotation])];
}

甚至我也曾尝试在UILongPressGestureRecongnizer的其他状态中添加旋转手势，如UIGestureRecognizerStateRecognized、UIGestureRecognizerStateChanged、UIGestureRecognizerStatePossible。没有一个人为我工作。

我面临的问题是，一旦登录手势检测到，它就不会为同一个手指的触摸添加旋转手势。我必须留下手指触摸，当我试图旋转的时候，它会工作的很好。但我希望允许用户开始旋转，只要长按手势检测到。

任何帮助都是非常感谢的！提前感谢！

Answer 1

您可能希望视图一起响应多个手势识别器。

当您可以调用longPressGestureRecognizer方法并设置Bool时，

didReceiveLongPress = YES;

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{
    if(didReceiveLongPress)
       return YES;
    else
       return NO;
}

我假设您希望，旋转只发生在之后， longPress。或者，您可以删除IF大小写并直接返回“是”。