需要先应用UIRotationGestureRecognizer，然后再应用UILongPressGestureRecongnizer [英] Need to apply UIRotationGestureRecognizer followed by UILongPressGestureRecongnizer

问题描述

在一个视图上应用UILongPressGestureRecongnizer， 检查以下代码以供参考..

@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])];
}

甚至我也尝试过在UIGestureRecognizerStateRecognized、UIGestureRecognizerStateChanged、UIGestureRecognizerStatePossible等其他UILongPressGestureRecongnizer状态下添加旋转手势。没有一个对我起作用。

我面临的问题是，一旦LogPress手势检测到，它不会为相同的手指触摸添加旋转手势。我必须离开手指触摸，当我再次尝试旋转时，它会工作得很好。但我想让用户一检测到长按手势就开始旋转。

如有任何帮助，我们不胜感激！ 提前感谢！

推荐答案

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的方法并设置Bool时，

didReceiveLongPress = YES;

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

我假设您希望旋转仅在LongPress之后发生。或者，您可以删除IF大小写并直接返回YES。

这篇关于需要先应用UIRotationGestureRecognizer，然后再应用UILongPressGestureRecongnizer的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！