我通过包含使UINavigationController成为另一个视图控制器的子节点.一切正常,除了在打开呼叫状态栏打开时启动应用程序时出现的奇怪问题,然后在应用程序UI在屏幕上后将其切换回OFF.在状态栏的位置出现了一个奇怪的黑色间隙.
考虑下面的自包含示例应用程序：
#import <UIKit/UIKit.h>
@interface AppDelegate : UIResponder <UIApplicationDelegate>
@property (strong,nonatomic) UIWindow *window;
@end
@implementation AppDelegate
- (BOOL)application:(UIApplication *)app didFinishLaunchingWithOptions:(NSDictionary *)opt
{
// Content
UILabel * aLbl = [[UILabel alloc] initWithFrame:CGRectMake(20,100,200,40)];
aLbl.text = @"In-call status bar issue";
UIViewController * aContent = [[UIViewController alloc] init];
aContent.title = @"Title";
aContent.view.backgroundColor = UIColor.whiteColor;
[aContent.view addSubview:aLbl];
UINavigationController * aNav = [[UINavigationController alloc]
initWithRootViewController:aContent];
// Parentmost view controller containing the navigation view controller
UIViewController * aParent = [[UIViewController alloc] init];
[aParent.view addSubview:aNav.view];
[aParent addChildViewController:aNav];
[aNav didMoveToParentViewController:aParent];
self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
self.window.rootViewController = aParent;
[self.window makeKeyAndVisible];
return YES;
}
@end
int main(int argc,char ** argv)
{ @autoreleasepool { return UIApplicationMain(argc,argv,nil,@"AppDelegate"); } }
重现问题的最简单方法是：
>启动iOS模拟器.
>按⌘Y打开通话中状态栏.状态栏将变为宽绿色.
>手动启动应用程序并等待导航控制器出现.
>再次按⌘Y可关闭通话中状态栏.
UI现在应该如下所示：
有谁知道如何解决这个问题？
