UIView隐藏导航栏后退按钮文本如何使其可见？ [英] UIView hides Navigation bar back button text how to make it visible?

问题描述

我正在尝试将导航栏背景更改为渐变红色。
我已将子视图添加到导航栏，它将背景设置为我想要的颜色。
然后导航栏后退按钮文本是不可见的。
后退按钮可见，但文字不可见。

I am trying to change Navigation bar background to Gradient Red. I have added subview to navigation bar which sets background to Color I want. but then Navigation bar back button Text is invisible. Back button is visible but Text is not Visible.

UIView view = new UIView();
var gradient = new CAGradientLayer();
gradient.Frame = NavigationBar.Bounds;
gradient.NeedsDisplayOnBoundsChange = true;
gradient.MasksToBounds = true;
gradient.Colors = new CGColor[] { UIColor.FromRGB(248, 0, 0).CGColor, UIColor.FromRGB(143, 0, 0).CGColor };
view.Layer.InsertSublayer(gradient, 0);
UINavigationBar.Appearance.SetTitleTextAttributes(new UITextAttributes() { TextColor = UIColor.Clear });

var bounds = NavigationBar.Bounds;
this.NavigationBar.AddSubview(view);

推荐答案

我用渐变色创建了图像并使用了该图像作为NavigationBar的背景。对于iOS，请参阅下面的教程。

I created image out of gradient color and used that image as Background to NavigationBar. For iOS see below tutorial.

UINavigationBar tintColor with渐变

              UIGraphics.BeginImageContext(gradient.Bounds.Size);
                gradient.RenderInContext(UIGraphics.GetCurrentContext());
                UIImage backImage = Graphics.GetImageFromCurrentImageContext();
                UIGraphics.EndImageContext();      
                NavigationBar.BarStyle = UIBarStyle.Default;
  UINavigationBar.Appearance.SetBackgroundImage(backImage, UIBarMetrics.Default)

;

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