iOS9:自定义UIWindow使状态栏消失
当我在iOS9中创建自定义UIWindow时,窗口在屏幕上变得可见,但状态栏突然消失。
当窗口隐藏时,状态栏会再次出现。
下面是我在iOS9上用Xcode7 beta5获得的2个屏幕截图。
自定义窗口隐藏时的状态栏:
自定义窗口可见时的状态栏: (整个屏幕移动到顶部。)
这是我正在使用的代码(在iOS8上运行良好):
#define DEBUG_SHOWENV_HEIGHT 20.0f
@interface AppDelegate ()
@property (nonatomic) UIWindow* envWindow;
@end
-(UIWindow*)envWindow
{
if (_envWindow == nil)
{
// Create the window
_envWindow = [[UIWindow alloc] initWithFrame:CGRectMake(0.0f, self.window.frame.size.height, self.window.frame.size.width, DEBUG_SHOWENV_HEIGHT)];
_envWindow.rootViewController = [[UIViewController alloc] init]; // added since iOS9 to avoid the assertion
_envWindow.userInteractionEnabled = NO;
_envWindow.windowLevel = UIWindowLevelStatusBar;
_envWindow.backgroundColor = [UIColor colorWithRed:0.243 green:0.471 blue:0.992 alpha:0.8];
// Make a label
UILabel* labelEnv = [[UILabel alloc] initWithFrame:CGRectMake(8.0f, 0.0f, _envWindow.bounds.size.width - 16.0f, DEBUG_SHOWENV_HEIGHT)];
labelEnv.font = [UIFont boldSystemFontOfSize:12.0f];
labelEnv.textColor = [UIColor whiteColor];
labelEnv.text = @"DEVELOP ENVIRONMENT";
[_envWindow addSubview:labelEnv];
}
return _envWindow;
}
// ==== in applicationDidBecomeActive
// Show the window 2 seconds then hide it.
[self.envWindow.layer removeAllAnimations];
self.envWindow.frame = CGRectMake(0.0f, self.window.frame.size.height, self.window.frame.size.width, DEBUG_SHOWENV_HEIGHT);
self.envWindow.hidden = NO;
[UIView animateWithDuration:0.25f
delay:0.0f
options:UIViewAnimationOptionCurveEaseOut
animations:^{
self.envWindow.frame = CGRectMake(0.0f, self.window.frame.size.height - DEBUG_SHOWENV_HEIGHT, self.window.frame.size.width, DEBUG_SHOWENV_HEIGHT);
}
completion:^(BOOL finished) {
if (finished)
{
[UIView animateWithDuration:0.25f
delay:2.0f
options:UIViewAnimationOptionCurveEaseOut
animations:^{
self.envWindow.frame = CGRectMake(0.0f, self.window.frame.size.height, self.window.frame.size.width, DEBUG_SHOWENV_HEIGHT);
}
completion:^(BOOL finished) {
if (finished)
{
self.envWindow.hidden = YES;
}
}];
}
}];
我会很感激任何帮助。
解决了。 我需要在根视图控制器中实现此方法:
- (BOOL)prefersStatusBarHidden
{
return NO;
}
出于某些原因,此UIWindow中的根视图控制器隐藏了状态栏。 (尽管它通常默认返回NO)
所以不要这样做:
_envWindow.rootViewController = [[UIViewController alloc] init]; // added since iOS9 to avoid the assertion
我用prefersStatusBarHidden覆盖创建了我自己的视图控制器。
该行_envWindow.windowLevel = UIWindowLevelStatusBar;
使您的窗口与状态栏处于同一级别(z排序)。 我认为你想要的是UIWindowLevelNormal
,这样状态栏就会出现在它上面。
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