如何在iOS 7中以编程方式设置设备方向？-Java 学习之路

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（“抬头”模式），我想只支持纵向（或纵向颠倒）方向，此外，如果设备在风景，我想自动切换到纵向模式 .

在顶视图控制器中，我有以下内容：

- (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的答案，答案似乎是我应该使用"application setStatusBarOrientation" . 因此，在用户选择"heads-up"模式的方法中，我包括：

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

但是，这根本就没有做任何事情 . 虽然我可以物理移动设备以使其旋转为纵向，但它不会自动移动 .

实际上，在运行上面的代码后尝试以横向模式尝试以编程方式设置方向时，当我使用以下代码查询应用程序“statusBarOrientation”时，它对于横向保持为“4”：

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

好像autolayout可能没有被setStatusBarOrientation触发，所以我试图在之后添加这个代码，没有效果：

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

我意识到Apple希望将设备方向放在用户手中 . 但是，我希望能够在不进行“抬头”模式时支持横向模式 .

我错过了能够强制改变方向的东西吗？

16 回答

1
我遇到的问题与你相似 . 我需要锁定某些屏幕的设备方向（如Login）并允许其他屏幕旋转 .

经过一些更改并在下面得到一些答案后，我通过以下方式完成了
- 在项目的Info.plist中启用所有方向 .
- 禁用其中的方向ViewControllers，我需要设备不要旋转，就像在我的情况下登录屏幕 . 我需要在这个VC中覆盖 shouldAutorotate 方法：
-(BOOL)shouldAutorotate{ return NO; }

希望这对你有用 .
回复于 2024-04-30T03:24:12+08:00

这是iOS 7,8,9,10的完整工作示例如何将应用方向更改为当前相反的方向

Objective-C

- (void)flipOrientation
{
    NSNumber *value;
    UIInterfaceOrientation currentOrientation = [[UIApplication sharedApplication] statusBarOrientation];
    if(UIInterfaceOrientationIsPortrait(currentOrientation))
    {
        if(currentOrientation == UIInterfaceOrientationPortrait)
        {
            value = [NSNumber numberWithInt:UIInterfaceOrientationPortraitUpsideDown];
        }
        else //if(currentOrientation == UIInterfaceOrientationPortraitUpsideDown)
        {
            value = [NSNumber numberWithInt:UIInterfaceOrientationPortrait];
        }
    }
    else
    {
        if(currentOrientation == UIInterfaceOrientationLandscapeRight)
        {
            value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
        }
        else //if(currentOrientation == UIInterfaceOrientationLandscapeLeft)
        {
            value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeRight];
        }
    }
    [[UIDevice currentDevice] setValue:value forKey:@"orientation"];
    [UIViewController attemptRotationToDeviceOrientation];
}

Swift 3

func flipOrientation() -> Void
{
    let currentOrientation : UIInterfaceOrientation = UIApplication.shared.statusBarOrientation
    var value : Int = 0;
    if(UIInterfaceOrientationIsPortrait(currentOrientation))
    {
        if(currentOrientation == UIInterfaceOrientation.portrait)
        {
            value = UIInterfaceOrientation.portraitUpsideDown.rawValue
        }
        else //if(currentOrientation == UIInterfaceOrientation.portraitUpsideDown)
        {
            value = UIInterfaceOrientation.portrait.rawValue
        }
    }
    else
    {
        if(currentOrientation == UIInterfaceOrientation.landscapeRight)
        {
            value = UIInterfaceOrientation.landscapeLeft.rawValue
        }
        else //if(currentOrientation == UIInterfaceOrientation.landscapeLeft)
        {
            value = UIInterfaceOrientation.landscapeRight.rawValue
        }
    }
    UIDevice.current.setValue(value, forKey: "orientation")
    UIViewController.attemptRotationToDeviceOrientation()
}

回复于 2024-04-30T03:24:12+08:00

对于iOS 7和8：

Objective-C的：

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

斯威夫特3：

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

我在 - viewDidAppear: 中称呼它 .

回复于 2024-04-30T03:24:12+08:00

用这个 . 定位问题的完美解决方案..更早和更早

[[UIDevice currentDevice] setValue:
    [NSNumber numberWithInteger: UIInterfaceOrientationPortrait]
        forKey:@"orientation"];

回复于 2024-04-30T03:24:12+08:00

10

当条件发生变化时，您需要调用attemptRotationToDeviceOrientation (UIViewController)使系统调用 supportedInterfaceOrientations .

回复于 2024-04-30T03:24:12+08:00

这对我有用 Xcode 6＆5 .

- (BOOL)shouldAutorotate {
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations {
    return (UIInterfaceOrientationMaskPortrait);
}

回复于 2024-04-30T03:24:12+08:00

请尝试使用您的代码 .

-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

一旦用户选择任何选项，然后调用此方法，因为用户可以处于横向模式，然后他可以在同一个视图控制器中只设置纵向模式，因此自动视图应该移动到纵向模式，以便在该按钮中调用此方法

-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

回复于 2024-04-30T03:24:12+08:00

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

确实有效但您必须在视图控制器中返回shouldAutorotate并带YES

- (BOOL)shouldAutorotate
{
    return self.shouldAutoRotate;
}

但是如果你这样做，你的VC会在用户旋转设备时自动旋转...所以我把它改为：

@property (nonatomic, assign) BOOL shouldAutoRotate;

- (BOOL)shouldAutorotate
{
    return self.shouldAutoRotate;
}

我打电话给

- (void)swithInterfaceOrientation:(UIInterfaceOrientation)orientation
{
    self.rootVC.shouldAutoRotate = YES;

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

通过按钮单击强制新方向 . 要将shouldAutoRotate设置为NO，我将添加到rootVC中

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
{
    self.shouldAutoRotate = NO;
}

PS：此解决方法也适用于所有模拟器 .

回复于 2024-04-30T03:24:12+08:00

1
对我有用的唯一方法是呈现虚拟模态视图控制器 .
```
UIViewController* dummyVC = [[UIViewController alloc] init];
dummyVC.view = [[UIView alloc] init];
[self presentModalViewController:dummyVC animated:NO];
[self dismissModalViewControllerAnimated:NO];
```
当取消模态视图控制器时，将要求VC更新接口方向 .

奇怪的是，当推送/弹出具有不同支持的接口方向的子视图控制器时，UINavigationController正是这样做的（在iOS 6.1,7.0上测试过） .
回复于 2024-04-30T03:24:12+08:00

此解决方案允许您通过暂时覆盖 UIDevice.current.orientation 的值然后要求系统旋转接口以匹配设备的旋转来强制某个接口方向：

Important: This is a hack, and could stop working at any moment

在应用程序的根视图控制器中添加以下内容：

class RootViewController : UIViewController {
    private var _interfaceOrientation: UIInterfaceOrientation = .portrait
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask { return UIInterfaceOrientationMask(from: _interfaceOrientation) }
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation { return _interfaceOrientation }

    override func viewDidLoad() {
        super.viewDidLoad()
        // Register for notifications
        NotificationCenter.default.addObserver(self, selector: #selector(RootViewController.handleInterfaceOrientationChangeRequestedNotification(_:)), name: .interfaceOrientationChangeRequested, object: nil)
    }

    deinit { NotificationCenter.default.removeObserver(self) }

    func handleInterfaceOrientationChangeRequestedNotification(_ notification: Notification) {
        guard let interfaceOrientation = notification.object as? UIInterfaceOrientation else { return }
        _interfaceOrientation = interfaceOrientation
        // Set device orientation
        // Important:
        // • Passing a UIDeviceOrientation here doesn't work, but passing a UIInterfaceOrientation does
        // • This is a hack, and could stop working at any moment
        UIDevice.current.setValue(interfaceOrientation.rawValue, forKey: "orientation")
        // Rotate the interface to the device orientation we just set
        UIViewController.attemptRotationToDeviceOrientation()
    }
}

private extension UIInterfaceOrientationMask {

    init(from interfaceOrientation: UIInterfaceOrientation) {
        switch interfaceOrientation {
        case .portrait: self = .portrait
        case .landscapeLeft: self = .landscapeLeft
        case .landscapeRight: self = .landscapeRight
        case .portraitUpsideDown: self = .portraitUpsideDown
        case .unknown: self = .portrait
        }
    }
}

extension Notification.Name {
    static let interfaceOrientationChangeRequested = Notification.Name(rawValue: "interfaceOrientationChangeRequested")
}

确保在“部署信息”下检查所有接口方向：

Interface Orientations

请求界面方向在您需要的地方更改：

NotificationCenter.default.post(name: .interfaceOrientationChangeRequested, object: UIInterfaceOrientation.landscapeRight)

回复于 2024-04-30T03:24:12+08:00

如果您想将应用程序的主视图锁定为纵向，但想要在横向中打开弹出视图，并且您正在使用tabBarController作为rootViewController，则可以在AppDelegate上使用此代码 .

AppDelegate.h

@interface AppDelegate : UIResponder <UIApplicationDelegate, UITabBarControllerDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (strong, nonatomic) UITabBarController *tabBarController;

@end

AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    // Create a tab bar and set it as root view for the application
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.delegate = self;
    self.window.rootViewController = self.tabBarController;

    ...
}

- (NSUInteger)tabBarControllerSupportedInterfaceOrientations:(UITabBarController *)tabBarController
{
    return UIInterfaceOrientationMaskPortrait;
}

- (UIInterfaceOrientation)tabBarControllerPreferredInterfaceOrientationForPresentation:(UITabBarController *)tabBarController
{
    return UIInterfaceOrientationPortrait;
}

它工作得很好 .

在viewController中，您希望以横向显示，只需使用以下内容：

- (NSUInteger)supportedInterfaceOrientations {
    return UIInterfaceOrientationMaskLandscape;
}

- (BOOL)shouldAutorotate {
    return YES;
}

回复于 2024-04-30T03:24:12+08:00

将此语句添加到 AppDelegate.h

//whether to allow cross screen marker 
@property (nonatomic, assign) allowRotation BOOL;

将此段代码写入 AppDelegate.m

- (UIInterfaceOrientationMask) application: (UIApplication *) supportedInterfaceOrientationsForWindow: application (UIWindow *) window {
    If (self.allowRotation) {
        UIInterfaceOrientationMaskAll return;
    }
    UIInterfaceOrientationMaskPortrait return;
}

更改委托应用的 allowRotation 属性

回复于 2024-04-30T03:24:12+08:00

1
如果你有一个应该保持在纵向模式的UIViewController，只需添加这个覆盖就可以了 .
```
override func supportedInterfaceOrientations() -> UIInterfaceOrientationMask {
    return UIInterfaceOrientationMask.Portrait
}
```
最好的部分是在显示此视图时没有动画，它刚刚处于正确的方向 .
回复于 2024-04-30T03:24:12+08:00

基础UINavigationController应具有以下回调，以便子项可以决定他们想要的方向 .

-(NSUInteger)supportedInterfaceOrientations {
    UIViewController *topVC = self.topViewController;
    return topVC.supportedInterfaceOrientations;
}

-(BOOL)shouldAutorotate {
   UIViewController *topVC = self.topViewController;
   return [topVC shouldAutorotate];
}

回复于 2024-04-30T03:24:12+08:00

190
如果您只想要纵向模式，在iOS 9（Xcode 7）中，您可以：
- 转到Info.plist
- 选择"Supported interface orientations"项目
- 删除"Landscape(left home button)"和"Landscape(right home button)"
回复于 2024-04-30T03:24:12+08:00

这对我很有帮助....

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

回复于 2024-04-30T03:24:12+08:00

如何在iOS 7中以编程方式设置设备方向？

16 回答

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