ios - Xamarin iOS Webkit : How do I resolve NIDActionArity1V59?

Question

我需要在子类中重写以下 DecidePolicy()，但我遇到构建错误，因为编译器无法解析 NIDActionArity1V59。 NIDActionArity1V59 在哪里实现，以便我可以应用所需的 using 语句，

using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using Foundation;
using ObjCRuntime;

namespace WebKit
{
    //
    // Summary:
    //     Delegate object for WebKit.WKNavigation objects, provides methods relating to
    //     navigation and load policies.
    [Introduced(PlatformName.MacOSX, 10, 10, PlatformArchitecture.Arch64, null)]
    [Introduced(PlatformName.iOS, 8, 0, PlatformArchitecture.None, null)]
    [Model]
    [Protocol]
    [Register("WKNavigationDelegate", false)]
    public class WKNavigationDelegate : NSObject, IWKNavigationDelegate, INativeObject, IDisposable
    {
        [...]
        //
        // Summary:
        //     Assigns an action to be taken after the specified navigationAction has been either
        //     canceled or allowed.
        [CompilerGenerated]
        [Export("webView:decidePolicyForNavigationAction:decisionHandler:")]
        public virtual void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, [BlockProxy(typeof(NIDActionArity1V59))] Action<WKNavigationActionPolicy> decisionHandler);


        [...]
    }
}

Answer 1

为什么需要这个属性？您可以像这样简单地覆盖它

public class MyNavigationDelegate : WKNavigationDelegate
{
    public override void DecidePolicy(WKWebView webView, WKNavigationAction navigationAction, Action<WKNavigationActionPolicy> decisionHandler)
    {
        // do some stuff
    }
}

据我所知，BlockProxy 属性仅在内部使用。 https://developer.xamarin.com/api/type/ObjCRuntime.BlockProxyAttribute/

如果你看一下 documentation您不会看到单个属性，因为它们不是函数签名的一部分。所以我猜，你对反编译源代码看得太深了，让自己有点困惑 ;)

提示:当您键入 override 后跟一个空格时，Visual Studio 会为您提供正确的重载。所以您不必搜索它们。