UISwipeGestureRecognizer 似乎不尊重 iPhone 3G 上当前的 UIDevice 方向

Question

我注册了四个 UIGestureSwipeRecognizers（每个方向一个），它们在 iPhone 4/4S（iOS 4.3 和 5）和 iPad 1/2（iOS 4.NotSure 和 5）上按预期工作。这是一款游戏，因此唯一允许的设备方向是 LandscapeRight 和 LandscapeLeft。然而，在装有 iOS 4.1 的 iPhone 3G 上，滑动识别器会做出响应，就好像设备处于纵向握持状态一样。换句话说，在 iPhone 3G 上，在 LandscapeLeft 中应该向上滑动的内容被注册为向右滑动。事实上，所有四个滑动识别器的行为就像设备处于纵向模式一样；但是，我检查了 [[UIDevice currentDevice]orientation] 并且它总是返回 UIDeviceOrientationLandscapeLeft

另外，该应用程序是一个基于 cocos2d 1.0.1 模板构建的游戏。

我可能做错了什么？

这是我注册四个滑动识别器的代码：

_swipeRecognizer_right = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeRightDetected)];
_swipeRecognizer_right.direction = UISwipeGestureRecognizerDirectionRight;
[self.view addGestureRecognizer:_swipeRecognizer_right];
_swipeRecognizer_right.delegate = self;

_swipeRecognizer_left = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeLeftDetected)];
_swipeRecognizer_left.direction = UISwipeGestureRecognizerDirectionLeft;
[self.view addGestureRecognizer:_swipeRecognizer_left];
_swipeRecognizer_left.delegate = self;

_swipeRecognizer_up = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeUpDetected)];
_swipeRecognizer_up.direction = UISwipeGestureRecognizerDirectionUp;
[self.view addGestureRecognizer:_swipeRecognizer_up];
_swipeRecognizer_up.delegate = self;

_swipeRecognizer_down = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swipeDownDetected)];
_swipeRecognizer_down.direction = UISwipeGestureRecognizerDirectionDown;
[self.view addGestureRecognizer:_swipeRecognizer_down];
_swipeRecognizer_down.delegate = self;

Answer 1

除了转换方向之外没有其他办法。我已经使用此内部方法在 Kobold2D 的滑动手势识别器中完成了此操作，应该很容易适应

-(KKSwipeGestureDirection) convertSwipeDirection:(UISwipeGestureRecognizerDirection)uiDirection
{
    // portrait mode direction remains unchanged
    KKSwipeGestureDirection direction = (KKSwipeGestureDirection)uiDirection;

    switch (uiDirection)
    {
        case UISwipeGestureRecognizerDirectionRight:
        {
            switch (director.deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = KKSwipeGestureDirectionLeft;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = KKSwipeGestureDirectionUp;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = KKSwipeGestureDirectionDown;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionLeft:
        {
            switch (director.deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = KKSwipeGestureDirectionRight;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = KKSwipeGestureDirectionDown;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = KKSwipeGestureDirectionUp;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionUp:
        {
            switch (director.deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = KKSwipeGestureDirectionDown;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = KKSwipeGestureDirectionLeft;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = KKSwipeGestureDirectionRight;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionDown:
        {
            switch (director.deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = KKSwipeGestureDirectionUp;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = KKSwipeGestureDirectionRight;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = KKSwipeGestureDirectionLeft;
                    break;
                default:
                    break;
            }
            break;
        }
    }

    return direction;
}

：使用Cocos2D 2.x的人应该知道CCDirector不再具有deviceOrientation属性。相反，您只需从 UIDevice 获取方向：

UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

然后只需将 CC 替换为 UI 前缀来更改所有案例标签，例如

case CCDeviceOrientationPortraitUpsideDown:

应更改为：

case UIDeviceOrientationPortraitUpsideDown:

Answer 2

我已将 @LearnCocos2D 提供的函数转换为 Cocos2d-iphone 专用代码（即独立于 Kobold2D）：

- (UISwipeGestureRecognizerDirection) convertSwipeDirection:(UISwipeGestureRecognizerDirection)uiDirection
{
    // portrait mode direction remains unchanged
    UISwipeGestureRecognizerDirection direction = (UISwipeGestureRecognizerDirection)uiDirection;

    // Get cocod2d device orientation
    ccDeviceOrientation deviceOrientation = [[CCDirector sharedDirector] deviceOrientation];

    switch (uiDirection)
    {
        case UISwipeGestureRecognizerDirectionRight:
        {
            switch (deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = UISwipeGestureRecognizerDirectionLeft;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = UISwipeGestureRecognizerDirectionUp;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = UISwipeGestureRecognizerDirectionDown;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionLeft:
        {
            switch (deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = UISwipeGestureRecognizerDirectionRight;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = UISwipeGestureRecognizerDirectionDown;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = UISwipeGestureRecognizerDirectionUp;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionUp:
        {
            switch (deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = UISwipeGestureRecognizerDirectionDown;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = UISwipeGestureRecognizerDirectionLeft;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = UISwipeGestureRecognizerDirectionRight;
                    break;
                default:
                    break;
            }
            break;
        }

        case UISwipeGestureRecognizerDirectionDown:
        {
            switch (deviceOrientation)
            {
                case CCDeviceOrientationPortraitUpsideDown:
                    direction = UISwipeGestureRecognizerDirectionUp;
                    break;
                case CCDeviceOrientationLandscapeLeft:
                    direction = UISwipeGestureRecognizerDirectionRight;
                    break;
                case CCDeviceOrientationLandscapeRight:
                    direction = UISwipeGestureRecognizerDirectionLeft;
                    break;
                default:
                    break;
            }
            break;
        }
    }

    return direction;
}