iOS development skills: How to set the font color of the status bar

The font of the status bar is black: UIStatusBarStyleDefault

The font of the status bar is white: UIStatusBarStyleLightContent

1. In, set View controller-based status bar appearance to NO

The color of the status bar font is only set by the following attributes, and the default is white:

// default is UIStatusBarStyleDefault
[UIApplication sharedApplication].statusBarStyle

Solution to different colors of status column fonts in individual vcs

1. In, set View controller-based status bar appearance to NO.

2. In app delegate:

[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;

3. In the vc with different font colors in individual status columns

-(void)viewWillAppear:(BOOL)animated{
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleDefault;
}

-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleLightContent;
}

2. In, set the View controller-based status bar appearance to YES, or there is no setting.

View controller-based status bar appearanceThe default value is YES.

ifView controller-based status bar appearancefor YES.

but[UIApplication sharedApplication].statusBarStyleinvalid.

Use the following method:

1. Rewrite the preferredStatusBarStyle method of vc in vc.

-(UIStatusBarStyle)preferredStatusBarStyle
{

return UIStatusBarStyleDefault;
}

2. Call in viewDidload: [self setNeedsStatusBarAppearanceUpdate];

However, when vc is in Nav, the above method is useless, and the preferredStatusBarStyle method in vc does not need to be called at all.

The reason is,[self setNeedsStatusBarAppearanceUpdate]After issuing,

Only the preferredStatusBarStyle method in the navigation controller will be called.

The preferredStatusBarStyley method in vc will not be called.

There are two solutions:

Method 1:

Setting the barStyle property of the navbar will affect the font and background color of the status bar. as follows.

//The font of status bar is white
//The background color of the navigation bar is black.
 = UIBarStyleBlack;

//The font of status bar is black
//The background color of the navigation bar is white, and the background color of the status bar is also white.
// = UIBarStyleDefault;

Method 2:

Customize a subclass of nav bar, and override the preferredStatusBarStyle method in this subclass:

MyNav* nav = [[MyNav alloc] initWithRootViewController:vc];

 = nav;

@implementation MyNav

- (UIStatusBarStyle)preferredStatusBarStyle

{

UIViewController* topVC = ;

return [topVC preferredStatusBarStyle];

}

Attachment: Modify the background color of the status bar (involving the hierarchical relationship of UIWindow)

/*Change the background color of the status bar. Because the status bar has a higher level, you can get the effect by adding it as follows*/
UIView* stateView = [[UIView alloc] initWithFrame:CGRectMake(0, -20, SCREEN_WIDTH, 20)];
[ addSubview:stateView];
 = [UIColor purpleColor];

Note: Because in OC, you should know that UIWindow has three levels, as follows:

UIKIT_EXTERN const UIWindowLevel UIWindowLevelNormal;
UIKIT_EXTERN const UIWindowLevel UIWindowLevelAlert;
UIKIT_EXTERN const UIWindowLevel UIWindowLevelStatusBar

The values ​​of the priority of their levels correspond to:

UIWindowLevelNormal： 0

UIWindowLevelAlert： 1000

UIWindowLevelStatusBar：2000

(And the hierarchical priority of UIAlertView is 1996, and the hierarchical priority of UIActionSheet is 2001)
Priority

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