9

在 iOS 8 上，我对导航栏和方向更改有一个奇怪的行为。

我有一个导航控制器，它报告支持的界面方向UIInterfaceOrientationMaskLandscapeRight。导航栏具有横向方向的预期高度（遗憾的是我无权发布屏幕截图）。

然后我启动一个仅支持UIInterfaceOrientationMaskPortrait. 当演示动画开始时，底层导航控制器的指标似乎更改为纵向演示，因为导航栏的高度增长到其纵向大小，如上图所示。

iOS 7 不会出现这种行为。我错过了什么？我想恢复旧的行为。

以下是上述简单示例的完整代码：

@implementation AppDelegate

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


    DOGButtonViewController *root = [DOGButtonViewController new];
    DOGOrientedNavigationController *navi = [[DOGOrientedNavigationController alloc] initWithRootViewController:root];
    navi.allowedInterfaceOrientations = UIInterfaceOrientationMaskLandscapeRight;

    self.window.rootViewController = navi;

    [self.window makeKeyAndVisible];
    return YES;
}

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
{
    return UIInterfaceOrientationMaskLandscapeRight | UIInterfaceOrientationMaskPortrait;
}

@end


@implementation DOGOrientedNavigationController

- (NSUInteger)supportedInterfaceOrientations
{
    return self.allowedInterfaceOrientations;
}

@end

@implementation DOGButtonViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"Button View Controller";
}

- (BOOL)prefersStatusBarHidden
{
    return YES;
}

- (IBAction)buttonClicked:(id)sender
{
    DOGPortraitViewController *vc = [DOGPortraitViewController new];
    [self presentViewController:vc animated:YES completion:nil];
}

@end

@implementation DOGPortraitViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.title = @"Portrait Title";
}

- (NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

- (IBAction)buttonClicked:(id)sender
{
    [self.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}

- (BOOL)prefersStatusBarHidden
{
    return YES;
}

@end

在更复杂的设置中，我还体验到导航控制器中包含的 UIWebView 中的文本在呈现纵向模式时被放大。关闭模式时，文本不会调整为其原始大小。

4

1 回答 1

0

由于缺乏更好的选择，我为此做了一些修改。基本上在我显示模态视图之前，我会截屏并将其放在呈现视图控制器的顶部。

显然，当视图重新出现时，我必须删除此屏幕截图

  func showScreenShot () {
    let image = screenShot()
    self.screenShotImageView = UIImageView(image: image)
    self.view.addSubview(self.screenShotImageView!)
  }

func screenShot () -> UIImage {
    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, true, UIScreen.mainScreen().scale)
    self.view.layer.renderInContext(UIGraphicsGetCurrentContext())
    let image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return image
}

func removeScreenShot () {
  if let screenImageView = self.screenShotImageView {
   screenImageView.removeFromSuperview()
   self.screenShotImageView = nil
  }
}
于 2014-11-24T08:25:54.500 回答