Xamarin.Forms PCL/SAP自定義渲染與paintcode 3支持

Question

夥計們！我有一個非常好的問題，我正在使用Paintcode 3，並且正在使用Xamarin.Forms（PCL/SAP）項目。我現在有一個示例項目正在運行，並且我在paintcode 3中有一個自定義繪圖。但是，我瞭解paintcode是假定本機工作與c＃Xamarin。然而，我在想，我可以創建一個自定義渲染器my xamarin.forms項目，然後提取自定義的paintcode 3繪圖，然後創建一個渲染並將其粘貼在那裏。在我發佈任何代碼之前，我的問題是之前已經完成了這種方法，或者任何人嘗試過？

這裏是我到目前爲止的代碼很簡單的東西：

我的主頁：

public class MainPageCS :ContentPage 
{ 
    public MainPageCS() 
    { 

     // The root page of your application 

     Title = "PCTest"; 
     Padding = new Thickness(0, 20, 0, 0); 

     Content = new TestView 
     { 


      // draw object will go here once i render it. 

      BackgroundColor = Color.Blue, 
      HorizontalOptions = LayoutOptions.Center, 
      VerticalOptions = LayoutOptions.Center 

     }; 

    } 

} 

簡單的內容頁面的測試頁從Xamarin.forms視圖繼承。

public class TestView : View 
{ 
    public TestView() 
    { 
    } 
} 

現在看起來很簡單，但是，這裏是它變得怪異的地方這裏是我創建的paintcode項目。這裏是圖像。 PaintCodeProjectImage

現在，下面是生成該圖像的代碼。 TestChatBox.cs

namespace PaintCodeStyleKitTest 
{ 
[Register("TestChatBox")] 
public class TestChatBox : NSObject 
{ 

    //// Cache 

    private static UIImage imageOfChatIcon; 
    private static NSObject[] chatIconTargets; 

    //// Initialization 

    static TestChatBox() 
    { 

     DrawChatIcon(); 
    } 

    //// Drawing Methods 

    public static void DrawChatIcon() 
    { 

     //// Oval 2 Drawing 
     var oval2Path = new UIBezierPath(); 
     oval2Path.MoveTo(new CGPoint(105.65f, 43.5f)); 
     oval2Path.AddCurveToPoint(new CGPoint(55.59f, 56.97f), new CGPoint(87.51f, 43.64f), new CGPoint(69.43f, 48.13f)); 
     oval2Path.AddCurveToPoint(new CGPoint(35.44f, 96.92f), new CGPoint(38.57f, 67.85f), new CGPoint(31.85f, 82.81f)); 
     UIColor.Gray.SetStroke(); 
     oval2Path.LineWidth = 9.0f; 
     oval2Path.LineCapStyle = CGLineCap.Round; 
     oval2Path.Stroke(); 


     //// Bezier 2 Drawing 
     var bezier2Path = new UIBezierPath(); 
     bezier2Path.MoveTo(new CGPoint(166.1f, 48.28f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(166.1f, 131.72f), new CGPoint(199.3f, 71.32f), new CGPoint(199.3f, 108.68f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(89.68f, 147.91f), new CGPoint(145.34f, 146.13f), new CGPoint(116.5f, 151.53f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(43.5f, 169.5f), new CGPoint(71.56f, 159.66f), new CGPoint(43.5f, 169.5f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(58.33f, 138.86f), new CGPoint(43.5f, 169.5f), new CGPoint(53.16f, 153.11f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(45.9f, 131.72f), new CGPoint(53.95f, 136.8f), new CGPoint(49.78f, 134.42f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(45.9f, 48.28f), new CGPoint(12.7f, 108.68f), new CGPoint(12.7f, 71.32f)); 
     bezier2Path.AddCurveToPoint(new CGPoint(166.1f, 48.28f), new CGPoint(79.09f, 25.24f), new CGPoint(132.91f, 25.24f)); 
     bezier2Path.ClosePath(); 
     UIColor.Red.SetStroke(); 
     bezier2Path.LineWidth = 9.0f; 
     bezier2Path.Stroke(); 
    } 

    //// Generated Images 

    public static UIImage ImageOfChatIcon 
    { 
     get 
     { 
      if (imageOfChatIcon != null) 
       return imageOfChatIcon; 

      UIGraphics.BeginImageContextWithOptions(new CGSize(210.0f, 190.0f), false, 0); 
      TestChatBox.DrawChatIcon(); 
      imageOfChatIcon = UIGraphics.GetImageFromCurrentImageContext(); 
      UIGraphics.EndImageContext(); 

      return imageOfChatIcon; 
     } 
    } 

    //// Customization Infrastructure 

    [Outlet] 
    public NSObject[] ChatIconTargets 
    { 
     get { return chatIconTargets; } 
     set 
     { 
      chatIconTargets = value; 
      foreach (NSObject target in value) 
      { 
       target.PerformSelector(new ObjCRuntime.Selector("setImage:"), ImageOfChatIcon, 0); 
      } 
     } 
    } 

} 

現在，以上是當我完成那個簡單的圖像時爲我生成的paintcode。 從閱讀paintcode文檔生成的代碼必須覆蓋drawRect方法，以繪製圖片中看到我的test.cs中不過

using System; 
    using Xamarin.Forms; 
    using CoreGraphics; 
    using UIKit; 
    using System.Drawing; 
    using Foundation; 
    using PaintCodeStyleKitTest; 
    namespace PCTest 
    { 
     public class Test : UIView 
     { 
      public Test() 
      { 
       TestChatBox.DrawChatIcon(); 
      } 

      public override void Draw(CGRect rect) 
      { 

       base.Draw(rect); 
       TestChatBox.DrawChatIcon(); 


      } 


     } 
    } 

這將覆蓋繪製方法和所謂成功作畫，當我嘗試使用我的測試渲染器文件來完成自定義渲染。

using System; 
using Xamarin.Forms; 
using PCTest; 
using UIKit; 
using Xamarin.Forms.Platform.iOS; 
using PaintCodeStyleKitTest; 
using PCTest.iOS; 
using Foundation; 
using UIKit; 
using CoreGraphics; 

[assembly: ExportRenderer(typeof(TestView), typeof(TestRenderer))] 
namespace PCTest.iOS 
{ 
    public class TestRenderer : ViewRenderer<TestView, Test> 
    { 
     Test txt; 
     protected override void OnElementChanged(ElementChangedEventArgs <TestView> e) 
      { 
       base.OnElementChanged(e); 
     if (Control == null) 
     { 
      //txt = new Test(tes); 
      Test tests = new Test(); 

      SetNativeControl(new Test()); 

     } 
      if (e.OldElement != null) 
      { 
       return; 
      } 

     } 


} 


} 

我運行我的示例應用程序，沒有任何東西被繪製到視圖中。我想知道爲什麼。我試圖申請一個簡單的內容頁面來查看我的樣本視圖是否會呈現，但是沒有呈現任何人都可以指出我對這個方向是正確的。有沒有什麼我對我的方法做了什麼錯誤？請幫忙！

Answer 1

您還沒有給予任何尺寸您的自定義控制，因此您的自定義UIView的Frame永遠不會被設置成它存在於0,0大小爲0,0。

var test = new TestView 
{ 
    WidthRequest = 200, 
    HeightRequest = 200, 
    BackgroundColor = Color.Blue, 
    HorizontalOptions = LayoutOptions.Center, 
    VerticalOptions = LayoutOptions.Center 
};