Change status bar colour on iOS13

3
votes

Before iOS 13 I could change the status bar colour using the following bit of code:

        UIView statusBar = UIApplication.SharedApplication.ValueForKey(new NSString("statusBar")) as UIView;
        if (statusBar.RespondsToSelector(new ObjCRuntime.Selector("setBackgroundColor:")))
        {
            statusBar.BackgroundColor = UIColor.Clear.FromHex(0x323232);
            statusBar.TintColor = UIColor.White;
            app.StatusBarStyle = UIStatusBarStyle.BlackOpaque;
        }

However, on iOS13 I get the following runtime error

Objective-C exception thrown. Name: NSInternalInconsistencyException Reason: App called -statusBar or -statusBarWindow on UIApplication: this code must be changed as there's no longer a status bar or status bar window. Use the statusBarManager object on the window scene instead.

Any idea on how to change the status bar on iOS13?

EDIT: Just to point out, this is for Xamarin and not for Swift. To clarify the duplicate marker.

3
c#xamarinxamarin.iosios13
Possible duplicate of How to change the status bar background color and text color on iOS 13? – Mac
@Mac How is this a duplicate? That is for swift, this is for Xamarin – David Pilkington
It's not duplicate .And here need a solution for xamarin ios . It seems like need a new way about setting background color of status bar . However , from apple document , there is no more detail about how to use UIStatusBarManager. – Junior Jiang
Error is the same, and the solution should be the same, you just have to convert the swift code to C# Xamarin code. That said, I did a quick test and KeyWindow is always nuil, so the answers from that dupe post fail. – jgoldberger - MSFT
@jgoldberger-MSFT saying that the solution is the same just because the error is the same seems a little bit of an over simplification given the 2 frameworks at play here. – David Pilkington

3 Answers

7
votes

From error , you need to use UIStatusBarManager in IOS 13.

If you have updated VS to the latest version(Visual Studio 2019 version 16.3.0/Visual Studio 2019 for Mac version 8.3 above), you can change color as follow:

UIView statusBar = new UIView(UIApplication.SharedApplication.KeyWindow.WindowScene.StatusBarManager.StatusBarFrame);
statusBar.BackgroundColor = UIColor.Yellow;
UIApplication.SharedApplication.KeyWindow.AddSubview(statusBar);

Else the follow methods can make it works .

UIView statusBar = new UIView(UIApplication.SharedApplication.StatusBarFrame);
statusBar.BackgroundColor = UIColor.Yellow;
UIApplication.SharedApplication.KeyWindow.AddSubview(statusBar);

If the view is not fully rendered , UIApplication.SharedApplication.KeyWindow will return null .So you can change status bar color after fully rendered . Here is the sample .

===================================Update=================================

If in Forms project , you can have a try with invoking method in AppDelegate.cs

public override void OnActivated(UIApplication uiApplication)
{
    if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
    {
        // If VS has updated to the latest version , you can use StatusBarManager , else use the first line code
        // UIView statusBar = new UIView(UIApplication.SharedApplication.StatusBarFrame);
        UIView statusBar = new UIView(UIApplication.SharedApplication.KeyWindow.WindowScene.StatusBarManager.StatusBarFrame);
        statusBar.BackgroundColor = UIColor.Red;
        UIApplication.SharedApplication.KeyWindow.AddSubview(statusBar);
    }
    else
    {
        UIView statusBar = UIApplication.SharedApplication.ValueForKey(new NSString("statusBar")) as UIView;
        if (statusBar.RespondsToSelector(new ObjCRuntime.Selector("setBackgroundColor:")))
        {
            statusBar.BackgroundColor = UIColor.Red;
            UIApplication.SharedApplication.StatusBarStyle = UIStatusBarStyle.BlackOpaque;
        }
    }
    base.OnActivated(uiApplication);
}

Note :

Not sure this solurion will always work in AppDelegate.cs, better invoked in Controller.cs's method , because from iOS 13 , Apple have modified the architure of AppDelegate and added SceneDelegate to project.

0
votes

This also works, if used in ViewDidAppear override in a UIViewController. I previously tested in ViewWillAppear and even that was too soon to have a KeyWindow non-null:

public override void ViewDidAppear(bool animated)
{
    base.ViewDidAppear(animated);
    if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
    {
        //Obj-C: 
        // UIView *statusBar = [[UIView alloc]initWithFrame:[UIApplication sharedApplication].keyWindow.windowScene.statusBarManager.statusBarFrame] ;
        // statusBar.backgroundColor = [UIColor redColor];
        // [[UIApplication sharedApplication].keyWindow addSubview:statusBar];

        // Xamarin.iOS: 
        UIView statusBar = new UIView(UIApplication.SharedApplication.KeyWindow.WindowScene.StatusBarManager.StatusBarFrame);
        statusBar.BackgroundColor = UIColor.Red;
        UIApplication.SharedApplication.KeyWindow.AddSubview(statusBar);
    }
    else
    {
        UIView statusBar = UIApplication.SharedApplication.ValueForKey(new NSString("statusBar")) as UIView;
        if (statusBar.RespondsToSelector(new ObjCRuntime.Selector("setBackgroundColor:")))
        {
            statusBar.BackgroundColor = UIColor.Red;
            statusBar.TintColor = UIColor.White;
            UIApplication.SharedApplication.StatusBarStyle = UIStatusBarStyle.BlackOpaque;
        }
    }
}

And that is the same solution provided in the duplicate question: https://stackoverflow.com/a/58028658/2913599

-1
votes

Could you please try the below solution. it works fine for me in the same scenario

if (@available(iOS 13.0, *)) {            
            UIView *statusBar = [[UIView alloc]initWithFrame:[UIApplication sharedApplication].keyWindow.windowScene.statusBarManager.statusBarFrame];
            statusBar.backgroundColor = [UIColor redColor];
            [[UIApplication sharedApplication].keyWindow addSubview:statusBar];

        } else {
            // Fallback on earlier versions
            UIView *statusBar=[[UIApplication sharedApplication] valueForKey:@"statusBar"];
            statusBar.backgroundColor = [UIColor redColor];
            [statusBar setNeedsDisplay];
        }