private void SetNavBarItems()
{
var navPage = this.Element as NavigationPage;
if (navPage == null)
{
return;
}
var textAttributes = new UITextAttributes()
{
Font = UIFont.FromName(customFontName, customFontSize)
};
var textAttributesHighlighted = new UITextAttributes()
{
TextColor = Color.Black.ToUIColor(),
Font = UIFont.FromName(customFontName, customFontSize)
};
var theFont = UIFont.FromName(customFontName, customFontSize);
var nsDictSegmentFont = GetFontNSDictionaryReversed(theFont);
var segmentTextAttributes = new MyUITextAttributes(nsDictSegmentFont);
UISegmentedControl.Appearance.SetTitleTextAttributes(segmentTextAttributes, UIControlState.Normal);
UISegmentedControl.Appearance.SetTitleTextAttributes(segmentTextAttributes, UIControlState.Selected);
UIBarButtonItem.Appearance.SetTitleTextAttributes(textAttributes,
UIControlState.Normal);
UIBarButtonItem.Appearance.SetTitleTextAttributes(textAttributesHighlighted,
UIControlState.Highlighted);
}
using System;
using System.Collections.Generic;
using Foundation;
using ObjCRuntime;
using Xamarin.Forms;
using ToolbarCustomFont.iOS;
using Xamarin.Forms.Platform.iOS;
using UIKit;
[assembly: ExportRenderer(typeof (NavigationPage), typeof (CustomFontNavigationPageRenderer))]
namespace ToolbarCustomFont.iOS
{
// https://blog.xamarin.com/custom-fonts-in-ios/
public class CustomFontNavigationPageRenderer : NavigationRenderer
{
public CustomFontNavigationPageRenderer()
{
}
const string customFontName = "fontawesome";
nfloat customFontSize = 16;
public override void ViewWillAppear(bool animated)
{
base.ViewWillAppear(animated);
if (this.NavigationBar == null) return;
SetNavBarStyle();
// SetNavBarTitle();
SetNavBarItems();
}
public override void ViewDidAppear(bool animated)
{
base.ViewDidAppear(animated);
if (this.NavigationBar == null) return;
var navPage = this.Element;
if (navPage == null) return;
}
private void SetNavBarStyle()
{
NavigationBar.ShadowImage = new UIImage();
NavigationBar.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
UINavigationBar.Appearance.ShadowImage = new UIImage();
UINavigationBar.Appearance.SetBackgroundImage(new UIImage(), UIBarMetrics.Default);
}
private void SetNavBarItems()
{
var navPage = this.Element as NavigationPage;
if (navPage == null) return;
var textAttributes = new UITextAttributes()
{
Font = UIFont.FromName(customFontName, customFontSize)
} ;
var textAttributesHighlighted = new UITextAttributes()
{
TextColor = Color.Black.ToUIColor(),
Font = UIFont.FromName(customFontName, customFontSize)
} ;
var theFont = UIFont.FromName(customFontName, customFontSize);
var nsDictSegmentFont = GetFontNSDictionaryReversed(theFont);
var segmentTextAttributes = new MyUITextAttributes(nsDictSegmentFont);
UISegmentedControl.Appearance.SetTitleTextAttributes(segmentTextAttributes, UIControlState.Normal);
UISegmentedControl.Appearance.SetTitleTextAttributes(segmentTextAttributes, UIControlState.Selected);
UIBarButtonItem.Appearance.SetTitleTextAttributes(textAttributes,
UIControlState.Normal);
UIBarButtonItem.Appearance.SetTitleTextAttributes(textAttributesHighlighted,
UIControlState.Highlighted);
}
// assembles a reversed dictionary to workaround bug in iOS
public NSDictionary GetFontNSDictionaryReversed(UIFont font)
{
var handle = Dlfcn.dlopen("/System/Library/Frameworks/UIKit.framework/UIKit", 0);
var nsfontattributename = "NSFontAttributeName";
//var nsfontattributename = "UITextAttributeFont"; // deprecated
NSString UITextAttributeFont = Dlfcn.GetStringConstant(handle, nsfontattributename);
var valuekeys = new List<NSObject>();
if (font != null)
{
valuekeys.Add(font);
valuekeys.Add(UITextAttributeFont);
}
return new NSDictionary(valuekeys[0], valuekeys[0]);
}
// private void SetNavBarTitle()
// {
// var navPage = this.Element as NavigationPage;
//
// if (navPage == null) return;
//
// this.NavigationBar.TitleTextAttributes = new UIStringAttributes
// {
// Font = UIFont.FromName(customFontName, customFontSize),
// } ;
// }
}
public class MyUITextAttributes : UITextAttributes
{
private NSDictionary myDictionary;
public MyUITextAttributes(NSDictionary newDictionary)
{
this.myDictionary = newDictionary;
}
public new NSDictionary Dictionary
{
get
{
return ToDictionary();
}
}
public new NSDictionary ToDictionary()
{
return myDictionary;
}
}
}
