如何在iOS 7中以编程方式设置设备方向?

问题描述

我正在使用AutoLayout在iPad应用程序上工作，如果用户启用某种模式(平视"模式)，则我仅希望支持纵向(或纵向颠倒)方向，并且，如果设备处于横向模式，我想自动切换到纵向模式.

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.

在顶视图控制器中，我有以下内容:

In the top view controller, I have the following:

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

- (BOOL) shouldAutorotate {
    return TRUE;
}

根据我在其他地方看到的答案，答案似乎是我应该使用"application setStatusBarOrientation".因此，在用户选择平视"模式的方法中，我包括了:

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];

但是，这似乎没有任何作用.虽然我可以物理移动设备以使其旋转成纵向，但它不会自动旋转.

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.

实际上，在运行上述代码以尝试以编程方式设置方向后处于横向模式时，当我使用以下代码查询应用程序"statusBarOrientation"时，对于横向而言，它保持在"4":

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];

似乎自动布局不会被setStatusBarOrientation触发，因此我试图在此之后添加此代码，但毫无效果:

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Apple希望将设备定位交给用户.但是，我希望能够在不使用平视"模式时支持横向模式.

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.

我错过了一些可以改变方向的东西吗?

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

推荐答案

对于iOS 7& 8:

For iOS 7 & 8:

Objective-C:

Objective-C:

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

迅速3 +:

let value = UIInterfaceOrientation.landscapeLeft.rawValue
UIDevice.current.setValue(value, forKey: "orientation")

我在- viewDidAppear:中称呼它.

这篇关于如何在iOS 7中以编程方式设置设备方向?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！