UIBarButtonItem.Appearance doesn't works on IOS 13

FeduniakV

Hi!
I use navigation bar and right buttons on it. Before IOS 13, I had settings for those buttons in AppDelegate:

          var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
                attr.Font = UIFont.SystemFontOfSize(15);
                attr.TextColor = Color.FromHex("#2196F3").ToUIColor();
                UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
                UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);

But on new IOS it didn't work. Only way that I find it's write custom render for NavigationPage - but it works only on first page, when I use new NavigationPage(). I need change this style on every place. Please tell me if exist similar way as AppDelegate.``

ColeX

Try the following code , it works fine on my side .

     if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
        {
            var style = new UINavigationBarAppearance();

            var a = new UIStringAttributes();
            a.Font = UIFont.SystemFontOfSize(35);
            a.ForegroundColor = UIColor.Yellow;
            style.TitleTextAttributes = a;

            var dic = new NSDictionary<NSString, NSObject>(
                new NSString[] {a.Dictionary.Keys[0] as NSString, a.Dictionary.Keys[1] as NSString }, a.Dictionary.Values
                );

            var button = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
            button.Normal.TitleTextAttributes = dic;
            button.Highlighted.TitleTextAttributes = dic;
            style.ButtonAppearance = button;

            UINavigationBar.Appearance.StandardAppearance = style;
        }
        else
        {
            var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
            attr.Font = UIFont.SystemFontOfSize(15);
            attr.TextColor = UIColor.Red;
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);
        }

ColeX

UIBarButtonItem.Appearance does not work after iOS13 any more , you could use UINavigationBarAppearance instead .

Try the following code

      if(UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
        {
            var style = new UINavigationBarAppearance();
            style.ConfigureWithTransparentBackground();


            var a = new UIStringAttributes();
            a.Font = UIFont.SystemFontOfSize(15);
            a.ForegroundColor = Color.FromHex("#2196F3").ToUIColor();
            style.TitleTextAttributes = a;

            var button = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
            button.Normal.TitleTextAttributes = a.Dictionary as NSDictionary<NSString, NSObject>;
            button.Highlighted.TitleTextAttributes = a.Dictionary as NSDictionary<NSString, NSObject>;
            style.ButtonAppearance = button;

            UINavigationBar.Appearance.StandardAppearance = style;           
        }
        else
        {
            var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
            attr.Font = UIFont.SystemFontOfSize(15);
            attr.TextColor = Color.FromHex("#2196F3").ToUIColor();
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);
        }

Refer

https://stackoverflow.com/a/58082187/8187800
https://stackoverflow.com/a/57990366/8187800

FeduniakV

@ColeX said:
UIBarButtonItem.Appearance does not work after iOS13 any more , you could use UINavigationBarAppearance instead .

Try the following code

      if(UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
        {
            var style = new UINavigationBarAppearance();
            style.ConfigureWithTransparentBackground();


            var a = new UIStringAttributes();
            a.Font = UIFont.SystemFontOfSize(15);
            a.ForegroundColor = Color.FromHex("#2196F3").ToUIColor();
            style.TitleTextAttributes = a;

            var button = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
            button.Normal.TitleTextAttributes = a.Dictionary as NSDictionary<NSString, NSObject>;
            button.Highlighted.TitleTextAttributes = a.Dictionary as NSDictionary<NSString, NSObject>;
            style.ButtonAppearance = button;

            UINavigationBar.Appearance.StandardAppearance = style;           
        }
        else
        {
            var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
            attr.Font = UIFont.SystemFontOfSize(15);
            attr.TextColor = Color.FromHex("#2196F3").ToUIColor();
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);
        }

Refer

https://stackoverflow.com/a/58082187/8187800
https://stackoverflow.com/a/57990366/8187800

I've got errors

ColeX

Did you test on iOS 13 ? The error shows the class can't be accessible.

FeduniakV

@ColeX said:
Did you test on iOS 13 ? The error shows the class can't be accessible.

I updated XCode and VS. Now I get Exception:

ColeX

Try the following code , it works fine on my side .

     if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
        {
            var style = new UINavigationBarAppearance();

            var a = new UIStringAttributes();
            a.Font = UIFont.SystemFontOfSize(35);
            a.ForegroundColor = UIColor.Yellow;
            style.TitleTextAttributes = a;

            var dic = new NSDictionary<NSString, NSObject>(
                new NSString[] {a.Dictionary.Keys[0] as NSString, a.Dictionary.Keys[1] as NSString }, a.Dictionary.Values
                );

            var button = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
            button.Normal.TitleTextAttributes = dic;
            button.Highlighted.TitleTextAttributes = dic;
            style.ButtonAppearance = button;

            UINavigationBar.Appearance.StandardAppearance = style;
        }
        else
        {
            var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
            attr.Font = UIFont.SystemFontOfSize(15);
            attr.TextColor = UIColor.Red;
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);
        }

FeduniakV

@ColeX said:
Try the following code , it works fine on my side .

     if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
        {
            var style = new UINavigationBarAppearance();

            var a = new UIStringAttributes();
            a.Font = UIFont.SystemFontOfSize(35);
            a.ForegroundColor = UIColor.Yellow;
            style.TitleTextAttributes = a;

            var dic = new NSDictionary<NSString, NSObject>(
                new NSString[] {a.Dictionary.Keys[0] as NSString, a.Dictionary.Keys[1] as NSString }, a.Dictionary.Values
                );
       
            var button = new UIBarButtonItemAppearance(UIBarButtonItemStyle.Plain);
            button.Normal.TitleTextAttributes = dic;
            button.Highlighted.TitleTextAttributes = dic;
            style.ButtonAppearance = button;

            UINavigationBar.Appearance.StandardAppearance = style;
        }
        else
        {
            var attr = UIBarButtonItem.Appearance.GetTitleTextAttributes(UIControlState.Application);
            attr.Font = UIFont.SystemFontOfSize(15);
            attr.TextColor = UIColor.Red;
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Normal);
            UIBarButtonItem.Appearance.SetTitleTextAttributes(attr, UIControlState.Highlighted);
        }

Thanks a lot! It works fine

benjff

Has anyone else managed to get this to work? I'm running the latest VS and Xamarin.iOS with an emulated iOS 13.7 and 14.4 and this solution does nothing. Should the code go somewhere other than AppDelegate.cs?

I've literally reduced this to the most simple version I can think of (to set the nav bar title to yellow throughout the app) to test the code works and it's just doing nothing

        var style = new UINavigationBarAppearance();

        var a = new UIStringAttributes()
        {
            ForegroundColor = UIColor.Yellow
        };
        style.TitleTextAttributes = a;

        UINavigationBar.Appearance.StandardAppearance = style;

JohnH

@ColeX @Yelinzh there is a problem with the Microsoft Q&A site, @Benjff and I are trying to get an answer to this question by posting there but it is throwing access denied errors.