当iphone设备方向朝上/朝下时，我可以判断它是风景还是肖像？ [英] when iphone Device orientation is face up/down, can I tell if it´s landscape or portrait?

问题描述

我得到了这段代码，如果设备处于横向左/右或倒置，它会旋转并显示另一个视图控制器。但如果它朝上或面朝下，那么如何判断它是横向模式还是纵向？因为我只想面朝上或朝下并且在横向模式下旋转

I got this code that if the device is in landscape left/right or upside down it rotates and shows another view controller. but if it´s in the orientation face up or face down, then how can I tell if it´s in landscape mode or portrait? cause I only want to rotate if it´s face up or down and in landscape mode

    - (void)viewDidAppear:(BOOL)animated
    {
        UIDeviceOrientation orientation = [[UIDevice currentDevice]orientation];
        NSLog(@"orientation %d", orientation);
        if ((orientation == 2) || (orientation == 3) || (orientation == 4))
        {

            [self performSegueWithIdentifier:@"DisplayLandscapeView" sender:self];
            isShowingLandscapeView = YES;
    }
}

推荐答案

In UI代码通常不应取决于设备方向，而是用户界面方向。它们之间通常有区别，例如当视图控制器仅支持纵向时。

In UI code you usually should not depend on the device orientation but the user interface orientation. There's often a difference between them, for example when a view controller only supports portrait.

对于您的情况，最重要的区别是界面方向永远不会面朝上/朝下。

The most important difference for your case is that the interface orientation is never face up/down.

在您的情况下，您可以向视图控制器询问当前的用户界面方向： self.interfaceOrientation 。

In your case you can just ask the view controller for the current user interface orientation: self.interfaceOrientation.

您的情况可能有点像 if（deviceOrientation面朝上/朝下且interfaceOrientation是横向）

请记住，设备方向横向左侧意味着用户界面方向正确。

Bear in mind that a device orientation landscape left means a user interface orientation landscape right.

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