Getting navigation bar height in dependency service - Xamarin Forms





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i have this issue wherein i need to get the navigation bar height in my Dependency Service.



Currently I am stuck on what to follow here. I tried everything i find in stackoverflow and google but no one works for me.



Heres my code:



[assembly: Dependency(typeof(DeviceInfo))]
namespace Wicket.App.Mobile.iOS.Framework
{
public class DeviceInfo : IDeviceInfo
{
public float StatusBarHeight => (float)UIApplication.SharedApplication.StatusBarFrame.Size.Height;

public float NavigationBarHeight => GetNavigationBarHeight();

public static UINavigationController NavigationController { get; set; }

public float GetNavigationBarHeight()
{
//Get navigation bar height


return 0;
}
}
}


I already completed the android part and it works good. The only problem now is in iOS. I have tried getting the instance of navigationcontroller in AppDelegate so that I can just get the bar frame like this NavigationBar.Bounds.Height;










share|improve this question





























    0















    i have this issue wherein i need to get the navigation bar height in my Dependency Service.



    Currently I am stuck on what to follow here. I tried everything i find in stackoverflow and google but no one works for me.



    Heres my code:



    [assembly: Dependency(typeof(DeviceInfo))]
    namespace Wicket.App.Mobile.iOS.Framework
    {
    public class DeviceInfo : IDeviceInfo
    {
    public float StatusBarHeight => (float)UIApplication.SharedApplication.StatusBarFrame.Size.Height;

    public float NavigationBarHeight => GetNavigationBarHeight();

    public static UINavigationController NavigationController { get; set; }

    public float GetNavigationBarHeight()
    {
    //Get navigation bar height


    return 0;
    }
    }
    }


    I already completed the android part and it works good. The only problem now is in iOS. I have tried getting the instance of navigationcontroller in AppDelegate so that I can just get the bar frame like this NavigationBar.Bounds.Height;










    share|improve this question

























      0












      0








      0








      i have this issue wherein i need to get the navigation bar height in my Dependency Service.



      Currently I am stuck on what to follow here. I tried everything i find in stackoverflow and google but no one works for me.



      Heres my code:



      [assembly: Dependency(typeof(DeviceInfo))]
      namespace Wicket.App.Mobile.iOS.Framework
      {
      public class DeviceInfo : IDeviceInfo
      {
      public float StatusBarHeight => (float)UIApplication.SharedApplication.StatusBarFrame.Size.Height;

      public float NavigationBarHeight => GetNavigationBarHeight();

      public static UINavigationController NavigationController { get; set; }

      public float GetNavigationBarHeight()
      {
      //Get navigation bar height


      return 0;
      }
      }
      }


      I already completed the android part and it works good. The only problem now is in iOS. I have tried getting the instance of navigationcontroller in AppDelegate so that I can just get the bar frame like this NavigationBar.Bounds.Height;










      share|improve this question














      i have this issue wherein i need to get the navigation bar height in my Dependency Service.



      Currently I am stuck on what to follow here. I tried everything i find in stackoverflow and google but no one works for me.



      Heres my code:



      [assembly: Dependency(typeof(DeviceInfo))]
      namespace Wicket.App.Mobile.iOS.Framework
      {
      public class DeviceInfo : IDeviceInfo
      {
      public float StatusBarHeight => (float)UIApplication.SharedApplication.StatusBarFrame.Size.Height;

      public float NavigationBarHeight => GetNavigationBarHeight();

      public static UINavigationController NavigationController { get; set; }

      public float GetNavigationBarHeight()
      {
      //Get navigation bar height


      return 0;
      }
      }
      }


      I already completed the android part and it works good. The only problem now is in iOS. I have tried getting the instance of navigationcontroller in AppDelegate so that I can just get the bar frame like this NavigationBar.Bounds.Height;







      xamarin.forms xamarin.ios






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 16 '18 at 15:02









      Secret CoderSecret Coder

      835935




      835935
























          3 Answers
          3






          active

          oldest

          votes


















          0














          I think this should work:



          var navheight = GetTopViewController().NavigationController.NavigationBar.Frame.Height;


          public static UIViewController GetTopViewController()
          {
          var window = UIApplication.SharedApplication.KeyWindow;
          var vc = window.RootViewController;
          while (vc.PresentedViewController != null)
          vc = vc.PresentedViewController;

          if (vc is UINavigationController navController)
          vc = navController.ViewControllers.Last();

          return vc;
          }





          share|improve this answer


























          • i already tried that and it crash my app or it resullts to null

            – Secret Coder
            Nov 16 '18 at 15:28













          • What error you got?

            – Nirmal Subedi
            Nov 16 '18 at 15:29











          • its always result to null on NavigationController part. not i use the dependency on my Page constructor

            – Secret Coder
            Nov 16 '18 at 15:30













          • How is your Navigation Starts ?

            – Nirmal Subedi
            Nov 16 '18 at 15:33











          • it started from a master detail page

            – Secret Coder
            Nov 16 '18 at 15:45



















          0














          Solution:



          How about pass an instance of viewController as parameter in the function inside the IDeviceInfo?



          Try this:



           public void getNaviHeight(ContentPage vc)
          {
          var renderer = Platform.GetRenderer(vc);
          if (renderer == null)
          {
          renderer = RendererFactory.GetRenderer(vc);
          Platform.SetRenderer(vc, renderer);
          }
          var viewController = renderer.ViewController;

          var h = viewController.NavigationController?.NavigationBar.Frame.Height;

          }


          And use the dependency:



          public MainPage ()
          {
          DependencyService.Get<IDeviceInfo>().getNaviHeight(this);
          }





          share|improve this answer
























          • not working. NavigatioController always null

            – Secret Coder
            Nov 21 '18 at 17:47











          • Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:09











          • I get a ViewController but the NavigationController is always null

            – Secret Coder
            Nov 22 '18 at 3:13











          • So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:17











          • Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

            – Secret Coder
            Nov 22 '18 at 6:12



















          0














          this worked to me:



          var navigationBar = UIApplication.SharedApplication.KeyWindow.RootViewController.View.Subviews[0].Subviews.OfType<UINavigationBar>().FirstOrDefault();

          if(navigationBar != null)
          {
          // continue here...
          }





          share|improve this answer
























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            3 Answers
            3






            active

            oldest

            votes








            3 Answers
            3






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            0














            I think this should work:



            var navheight = GetTopViewController().NavigationController.NavigationBar.Frame.Height;


            public static UIViewController GetTopViewController()
            {
            var window = UIApplication.SharedApplication.KeyWindow;
            var vc = window.RootViewController;
            while (vc.PresentedViewController != null)
            vc = vc.PresentedViewController;

            if (vc is UINavigationController navController)
            vc = navController.ViewControllers.Last();

            return vc;
            }





            share|improve this answer


























            • i already tried that and it crash my app or it resullts to null

              – Secret Coder
              Nov 16 '18 at 15:28













            • What error you got?

              – Nirmal Subedi
              Nov 16 '18 at 15:29











            • its always result to null on NavigationController part. not i use the dependency on my Page constructor

              – Secret Coder
              Nov 16 '18 at 15:30













            • How is your Navigation Starts ?

              – Nirmal Subedi
              Nov 16 '18 at 15:33











            • it started from a master detail page

              – Secret Coder
              Nov 16 '18 at 15:45
















            0














            I think this should work:



            var navheight = GetTopViewController().NavigationController.NavigationBar.Frame.Height;


            public static UIViewController GetTopViewController()
            {
            var window = UIApplication.SharedApplication.KeyWindow;
            var vc = window.RootViewController;
            while (vc.PresentedViewController != null)
            vc = vc.PresentedViewController;

            if (vc is UINavigationController navController)
            vc = navController.ViewControllers.Last();

            return vc;
            }





            share|improve this answer


























            • i already tried that and it crash my app or it resullts to null

              – Secret Coder
              Nov 16 '18 at 15:28













            • What error you got?

              – Nirmal Subedi
              Nov 16 '18 at 15:29











            • its always result to null on NavigationController part. not i use the dependency on my Page constructor

              – Secret Coder
              Nov 16 '18 at 15:30













            • How is your Navigation Starts ?

              – Nirmal Subedi
              Nov 16 '18 at 15:33











            • it started from a master detail page

              – Secret Coder
              Nov 16 '18 at 15:45














            0












            0








            0







            I think this should work:



            var navheight = GetTopViewController().NavigationController.NavigationBar.Frame.Height;


            public static UIViewController GetTopViewController()
            {
            var window = UIApplication.SharedApplication.KeyWindow;
            var vc = window.RootViewController;
            while (vc.PresentedViewController != null)
            vc = vc.PresentedViewController;

            if (vc is UINavigationController navController)
            vc = navController.ViewControllers.Last();

            return vc;
            }





            share|improve this answer















            I think this should work:



            var navheight = GetTopViewController().NavigationController.NavigationBar.Frame.Height;


            public static UIViewController GetTopViewController()
            {
            var window = UIApplication.SharedApplication.KeyWindow;
            var vc = window.RootViewController;
            while (vc.PresentedViewController != null)
            vc = vc.PresentedViewController;

            if (vc is UINavigationController navController)
            vc = navController.ViewControllers.Last();

            return vc;
            }






            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 16 '18 at 15:54

























            answered Nov 16 '18 at 15:28









            Nirmal SubediNirmal Subedi

            1,5002924




            1,5002924













            • i already tried that and it crash my app or it resullts to null

              – Secret Coder
              Nov 16 '18 at 15:28













            • What error you got?

              – Nirmal Subedi
              Nov 16 '18 at 15:29











            • its always result to null on NavigationController part. not i use the dependency on my Page constructor

              – Secret Coder
              Nov 16 '18 at 15:30













            • How is your Navigation Starts ?

              – Nirmal Subedi
              Nov 16 '18 at 15:33











            • it started from a master detail page

              – Secret Coder
              Nov 16 '18 at 15:45



















            • i already tried that and it crash my app or it resullts to null

              – Secret Coder
              Nov 16 '18 at 15:28













            • What error you got?

              – Nirmal Subedi
              Nov 16 '18 at 15:29











            • its always result to null on NavigationController part. not i use the dependency on my Page constructor

              – Secret Coder
              Nov 16 '18 at 15:30













            • How is your Navigation Starts ?

              – Nirmal Subedi
              Nov 16 '18 at 15:33











            • it started from a master detail page

              – Secret Coder
              Nov 16 '18 at 15:45

















            i already tried that and it crash my app or it resullts to null

            – Secret Coder
            Nov 16 '18 at 15:28







            i already tried that and it crash my app or it resullts to null

            – Secret Coder
            Nov 16 '18 at 15:28















            What error you got?

            – Nirmal Subedi
            Nov 16 '18 at 15:29





            What error you got?

            – Nirmal Subedi
            Nov 16 '18 at 15:29













            its always result to null on NavigationController part. not i use the dependency on my Page constructor

            – Secret Coder
            Nov 16 '18 at 15:30







            its always result to null on NavigationController part. not i use the dependency on my Page constructor

            – Secret Coder
            Nov 16 '18 at 15:30















            How is your Navigation Starts ?

            – Nirmal Subedi
            Nov 16 '18 at 15:33





            How is your Navigation Starts ?

            – Nirmal Subedi
            Nov 16 '18 at 15:33













            it started from a master detail page

            – Secret Coder
            Nov 16 '18 at 15:45





            it started from a master detail page

            – Secret Coder
            Nov 16 '18 at 15:45













            0














            Solution:



            How about pass an instance of viewController as parameter in the function inside the IDeviceInfo?



            Try this:



             public void getNaviHeight(ContentPage vc)
            {
            var renderer = Platform.GetRenderer(vc);
            if (renderer == null)
            {
            renderer = RendererFactory.GetRenderer(vc);
            Platform.SetRenderer(vc, renderer);
            }
            var viewController = renderer.ViewController;

            var h = viewController.NavigationController?.NavigationBar.Frame.Height;

            }


            And use the dependency:



            public MainPage ()
            {
            DependencyService.Get<IDeviceInfo>().getNaviHeight(this);
            }





            share|improve this answer
























            • not working. NavigatioController always null

              – Secret Coder
              Nov 21 '18 at 17:47











            • Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:09











            • I get a ViewController but the NavigationController is always null

              – Secret Coder
              Nov 22 '18 at 3:13











            • So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:17











            • Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

              – Secret Coder
              Nov 22 '18 at 6:12
















            0














            Solution:



            How about pass an instance of viewController as parameter in the function inside the IDeviceInfo?



            Try this:



             public void getNaviHeight(ContentPage vc)
            {
            var renderer = Platform.GetRenderer(vc);
            if (renderer == null)
            {
            renderer = RendererFactory.GetRenderer(vc);
            Platform.SetRenderer(vc, renderer);
            }
            var viewController = renderer.ViewController;

            var h = viewController.NavigationController?.NavigationBar.Frame.Height;

            }


            And use the dependency:



            public MainPage ()
            {
            DependencyService.Get<IDeviceInfo>().getNaviHeight(this);
            }





            share|improve this answer
























            • not working. NavigatioController always null

              – Secret Coder
              Nov 21 '18 at 17:47











            • Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:09











            • I get a ViewController but the NavigationController is always null

              – Secret Coder
              Nov 22 '18 at 3:13











            • So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:17











            • Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

              – Secret Coder
              Nov 22 '18 at 6:12














            0












            0








            0







            Solution:



            How about pass an instance of viewController as parameter in the function inside the IDeviceInfo?



            Try this:



             public void getNaviHeight(ContentPage vc)
            {
            var renderer = Platform.GetRenderer(vc);
            if (renderer == null)
            {
            renderer = RendererFactory.GetRenderer(vc);
            Platform.SetRenderer(vc, renderer);
            }
            var viewController = renderer.ViewController;

            var h = viewController.NavigationController?.NavigationBar.Frame.Height;

            }


            And use the dependency:



            public MainPage ()
            {
            DependencyService.Get<IDeviceInfo>().getNaviHeight(this);
            }





            share|improve this answer













            Solution:



            How about pass an instance of viewController as parameter in the function inside the IDeviceInfo?



            Try this:



             public void getNaviHeight(ContentPage vc)
            {
            var renderer = Platform.GetRenderer(vc);
            if (renderer == null)
            {
            renderer = RendererFactory.GetRenderer(vc);
            Platform.SetRenderer(vc, renderer);
            }
            var viewController = renderer.ViewController;

            var h = viewController.NavigationController?.NavigationBar.Frame.Height;

            }


            And use the dependency:



            public MainPage ()
            {
            DependencyService.Get<IDeviceInfo>().getNaviHeight(this);
            }






            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 20 '18 at 6:19









            Jack Hua - MSFTJack Hua - MSFT

            1,449129




            1,449129













            • not working. NavigatioController always null

              – Secret Coder
              Nov 21 '18 at 17:47











            • Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:09











            • I get a ViewController but the NavigationController is always null

              – Secret Coder
              Nov 22 '18 at 3:13











            • So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:17











            • Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

              – Secret Coder
              Nov 22 '18 at 6:12



















            • not working. NavigatioController always null

              – Secret Coder
              Nov 21 '18 at 17:47











            • Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:09











            • I get a ViewController but the NavigationController is always null

              – Secret Coder
              Nov 22 '18 at 3:13











            • So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

              – Jack Hua - MSFT
              Nov 22 '18 at 3:17











            • Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

              – Secret Coder
              Nov 22 '18 at 6:12

















            not working. NavigatioController always null

            – Secret Coder
            Nov 21 '18 at 17:47





            not working. NavigatioController always null

            – Secret Coder
            Nov 21 '18 at 17:47













            Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:09





            Did you get the viewController? Can you provide a simple demo or some more codes to show the structure of your project?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:09













            I get a ViewController but the NavigationController is always null

            – Secret Coder
            Nov 22 '18 at 3:13





            I get a ViewController but the NavigationController is always null

            – Secret Coder
            Nov 22 '18 at 3:13













            So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:17





            So, is the viewController you get same as the controller your want? And Is the viewController really have a NavigationController in your code?

            – Jack Hua - MSFT
            Nov 22 '18 at 3:17













            Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

            – Secret Coder
            Nov 22 '18 at 6:12





            Im not sure with the viewcontroller I get is what I want. The page that I get has navigation bar with menu icon/burger icon. So im sure there should be a NavigationController

            – Secret Coder
            Nov 22 '18 at 6:12











            0














            this worked to me:



            var navigationBar = UIApplication.SharedApplication.KeyWindow.RootViewController.View.Subviews[0].Subviews.OfType<UINavigationBar>().FirstOrDefault();

            if(navigationBar != null)
            {
            // continue here...
            }





            share|improve this answer




























              0














              this worked to me:



              var navigationBar = UIApplication.SharedApplication.KeyWindow.RootViewController.View.Subviews[0].Subviews.OfType<UINavigationBar>().FirstOrDefault();

              if(navigationBar != null)
              {
              // continue here...
              }





              share|improve this answer


























                0












                0








                0







                this worked to me:



                var navigationBar = UIApplication.SharedApplication.KeyWindow.RootViewController.View.Subviews[0].Subviews.OfType<UINavigationBar>().FirstOrDefault();

                if(navigationBar != null)
                {
                // continue here...
                }





                share|improve this answer













                this worked to me:



                var navigationBar = UIApplication.SharedApplication.KeyWindow.RootViewController.View.Subviews[0].Subviews.OfType<UINavigationBar>().FirstOrDefault();

                if(navigationBar != null)
                {
                // continue here...
                }






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Feb 5 at 13:15









                Rudolf StepanRudolf Stepan

                114




                114






























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