我如何编程设置设备的方向在iOS7？ [英] How do I programmatically set device orientation in iOS7?

问题描述

我工作的一个iPad应用程序，使用自动布局，其中，如果用户启用某种模式（单挑模式），我想只支持人像（或纵向倒置）的方向，而且，如果设备处于风景，我想自动切换到肖像模式。

I am working on an iPad app, using autolayout, where if the user enables a certain mode ("heads-up" mode), I want to support only portrait (or portrait upside down) orientation, and furthermore, if the device is in landscape, I'd like to automatically switch to portrait mode.

在顶视图控制器，我有以下几点：

In the top view controller, I have the following:

- (NSUInteger) supportedInterfaceOrientations {
    if (self.modeHeadsUp) {
        return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown;
    } else {
        return UIInterfaceOrientationMaskAll;
    }
}

- (bool) shouldAutorotate {
    return TRUE;
}

基于我在其他地方看到这里的答案

，答案的看起来的是，我应该使用应用程序setStatusBarOrientation。因此，在该方法，其中用户已经选择了抬头模式，我已经包括：

Based on answers I've seen elsewhere here, the answer seems to be that I should use "application setStatusBarOrientation". Therefore, in the method where the user has selected "heads-up" mode, I have included:

    UIApplication *application = [UIApplication sharedApplication];
    [application setStatusBarOrientation:UIInterfaceOrientationPortrait
                                animated:YES];

然而，这只是似乎没有做任何事情。虽然我可以物理移动设备把它旋转​​到肖像，它不会自动执行此操作。

However, this simply doesn't seem to do anything. While I can physically move the device to get it to rotate into portrait, it doesn't do so automatically.

事实上，当在横向模式下运行上面的code后，尝试以编程方式设置方向，当我查询应用程序statusBarOrientation具有以下code，它仍然是4景观

In fact, when in landscape mode after running the above code to attempt to programmatically set the orientation, when I query the application "statusBarOrientation" with the following code, it remains at "4" for landscape:

UIApplication *application = [UIApplication sharedApplication];
int orientation = [application statusBarOrientation];
self.movesTextView.text = [NSString stringWithFormat:@"ORIENTATION %d", orientation];

这似乎是可能自动布局没有被用setStatusBarOrientation触发的，所以我尝试后添加此code，没有效果：

It seemed like maybe autolayout wasn't being triggered with the setStatusBarOrientation, so I attempted to add this code after, to no effect:

    [super updateViewConstraints];
    [self.view updateConstraints];

我意识到苹果希望在用户的手中离开设备的方向。不过，我想能支持横向模式时不单挑模式。

I realize Apple wants to leave device orientation in the hands of the user. However, I'd like to be able to support landscape mode when not in "heads-up" mode.

我缺少的东西是能够迫使方向更改？

Am I missing something to be able to force orientation change?

推荐答案

有关iOS的7安培; 8：

For iOS 7 & 8:

目标-C：

NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
[[UIDevice currentDevice] setValue:value forKey:@"orientation"];

斯威夫特：

let value = UIInterfaceOrientation.LandscapeLeft.rawValue
UIDevice.currentDevice().setValue(value, forKey: "orientation")

我把它称为 - viewDidAppear：

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