推荐答案
这是Android的自定义渲染器,您可以在其中更改Font Size
和Font Weight
.我已经用TODO标记了必须更改的值.
Here is an Custom Renderer for Android where you are able to change the Font Size
and also the Font Weight
. I've marked the values you have to change with an TODO.
using Android.Content;
using Android.Graphics;
using App5.Droid;
using Xamarin.Forms;
using Xamarin.Forms.Platform.Android.AppCompat;
[assembly: ExportRenderer(typeof(NavigationPage), typeof(CustomNavigationPageRenderer))]
namespace App5.Droid
{
public class CustomNavigationPageRenderer : NavigationPageRenderer
{
private Android.Support.V7.Widget.Toolbar _toolbar;
public CustomNavigationPageRenderer(Context context) : base(context)
{
}
public override void OnViewAdded(Android.Views.View child)
{
base.OnViewAdded(child);
if (child.GetType() == typeof(Android.Support.V7.Widget.Toolbar))
{
_toolbar = (Android.Support.V7.Widget.Toolbar)child;
_toolbar.ChildViewAdded += Toolbar_ChildViewAdded;
}
}
protected override void Dispose(bool disposing)
{
base.Dispose(disposing);
if (disposing)
{
_toolbar.ChildViewAdded -= Toolbar_ChildViewAdded;
}
}
private void Toolbar_ChildViewAdded(object sender, ChildViewAddedEventArgs e)
{
var view = e.Child.GetType();
System.Diagnostics.Debug.WriteLine(view);
if (e.Child.GetType() == typeof(Android.Support.V7.Widget.AppCompatTextView))
{
var textView = (Android.Support.V7.Widget.AppCompatTextView)e.Child;
// TODO: CHANGE VALUES HERE
textView.TextSize = 25;
textView.SetTypeface(null, TypefaceStyle.Bold);
_toolbar.ChildViewAdded -= Toolbar_ChildViewAdded;
}
}
}
}
这是针对iOS的自定义渲染器的实现.
Here is an implementation of a Custom Renderer for iOS.
using App5.iOS;
using UIKit;
using Xamarin.Forms;
using Xamarin.Forms.Platform.iOS;
[assembly: ExportRenderer(typeof(NavigationPage), typeof(CustomNavigationPageRenderer))]
namespace App5.iOS
{
public class CustomNavigationPageRenderer : NavigationRenderer
{
protected override void OnElementChanged(VisualElementChangedEventArgs e)
{
base.OnElementChanged(e);
if (e.NewElement != null)
{
var att = new UITextAttributes();
// TODO: Create your FontSize and FontWeight here
var fontSize = Font.SystemFontOfSize(30.0);
var boldFontSize = Font.SystemFontOfSize(35.0, FontAttributes.Bold);
// TODO: Apply your selected FontSize and FontWeight combination here
att.Font = boldFontSize.ToUIFont();
UINavigationBar.Appearance.SetTitleTextAttributes(att);
}
}
}
}
这篇关于如何更改导航页面中页眉的字体大小和粗细?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!