iOS 中是否有类似 android:actionBarSize 的属性？

如何解决iOS 中是否有类似 android:actionBarSize 的属性？

我正在 Xamarin 中开发，我不知道如何更改导航栏的高度。 对于 android 更容易，因为你有一个明确的属性“ActionBarSize”

我尝试了很多东西。使用 HeightRequest 属性创建一个 comun NavigationPage 不起作用

非常感谢

解决方法

在 iOS 中，我们可以使用自定义渲染器设置自定义 TitlView。

 using Foundation;
 using UIKit;
 using Xamarin.Forms.Platform.iOS;
 using Xamarin.Forms;
 using xxx.iOS;
 using CoreGraphics;
 using xxx;
 using ObjCRuntime;
 [assembly: ExportRenderer(typeof(ContentPage),typeof(MyPageRenderer))]
 namespace xxx.iOS
 {
public class MyPageRenderer: PageRenderer
{
    public override void ViewWillAppear(bool animated)
    {
        base.ViewWillAppear(animated);
        var page = Element as ContentPage;
        NavigationController.NavigationBar.Hidden = true;
        double height = IsiphoneX();
        UIView backView = new UIView()
        {
            BackgroundColor = UIColor.White,Frame = new CGRect(0,20,UIScreen.MainScreen.Bounds.Width,height),};
        UIButton backBtn = new UIButton() {
            Frame = new CGRect(20,height-44,40,44),Font = UIFont.SystemFontOfSize(18),} ;
        backBtn.SetTitle("Back",UIControlState.Normal);
        backBtn.SetTitleColor(UIColor.Blue,UIControlState.Normal);
        backBtn.AddTarget(this,new Selector("GoBack"),UIControlEvent.TouchUpInside);
        UILabel titleLabel = new UILabel() {
            Frame=new CGRect(UIScreen.MainScreen.Bounds.Width/2-75,150,Font = UIFont.SystemFontOfSize(20),Text = page.Title,TextColor = UIColor.Black,Lines = 0,};
        UILabel line = new UILabel() {
            Frame = new CGRect(0,height,0.5),BackgroundColor = UIColor.Black,};

        backView.AddSubview(backBtn);
        backView.AddSubview(titleLabel);
        backView.AddSubview(line);
        View.AddSubview(backView);
    }
     double IsiphoneX()
    {
        double height = 44; //set height as you want here !!!
        if (UIDevice.CurrentDevice.CheckSystemVersion(11,0))
        {
            if (UIApplication.SharedApplication.Delegate.GetWindow().SafeAreaInsets.Bottom > 0.0)
            {
                height = 64;  //set height as you want here !!!
            }
        }
        return height;
    }
    [Export("GoBack")]
    void GoBack()
    {
        NavigationController.PopViewController(true);
    }
    public override void ViewWillDisappear(bool animated)
    {
        base.ViewWillDisappear(animated);

        NavigationController.NavigationBar.Hidden = false;
    }
  }
 }