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的视图控制器的模态演示.当演示动画开始时,似乎底层导航控制器的度量被更改为纵向演示,因为导航栏的高度增长到其纵向大小,如上所述.
iOS 7不会出现此行为.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,我还会在呈现纵向模态时按比例放大导航控制器中包含的UIWebView中的文本.解除模态时,文本不会调整为原始大小.
解决方法
由于缺乏更好的选择,我已经为此做了一些破解.
基本上在我显示模态视图之前,我拍摄一个屏幕截图并将其放置在呈现视图控制器的顶部.
基本上在我显示模态视图之前,我拍摄一个屏幕截图并将其放置在呈现视图控制器的顶部.
显然我必须在视图重新出现时删除此屏幕截图
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
}
}
