绑定协议无法通过conformsToProtocol



使用Xamarin为一些外部代码创建绑定库时,我遇到了一个问题,尽管(据我所知)实现了协议中的所有选择器,但在Obj-C代码中,我的委托未能通过conformsToProtocol检查,因此代码不起作用。

以下是Objective-C头文件的样子(https://github.com/janrain/jump.ios/blob/master/Janrain/JRCapture/Classes/JRCapture.h):

@protocol JRCaptureDelegate <NSObject>
@optional
- (void)engageAuthenticationDialogDidFailToShowWithError:(NSError *)error;
- (void)engageAuthenticationDidCancel;
- (void)engageAuthenticationDidSucceedForUser:(NSDictionary *)engageAuthInfo forProvider:(NSString *)provider;
 - (void)engageAuthenticationDidFailWithError:(NSError *)error forProvider:(NSString *)provider;
- (void)captureSignInDidSucceedForUser:(JRCaptureUser *)captureUser
                            status:(JRCaptureRecordStatus)captureRecordStatus;
- (void)captureSignInDidFailWithError:(NSError *)error;
- (void)registerUserDidSucceed:(JRCaptureUser *)registeredUser;
- (void)registerUserDidFailWithError:(NSError *)error;
- (void)refreshAccessTokenDidSucceedWithContext:(id <NSObject>)context;
- (void)refreshAccessTokenDidFailWithError:(NSError *)error context:(id <NSObject>)context;
@end

这是ApiDefinition.cs中与之相对应的部分:

[Model, BaseType (typeof (NSObject))]
public partial interface JRCaptureDelegate {
    [Export ("engageAuthenticationDidCancel")]
    void EngageAuthenticationCancelled ();
    [Export ("engageAuthenticationDidSucceedForUser:forProvider:")]
    void AuthenticationSucceededForProvider (NSDictionary engageAuthInfo, string provider);
    [Export ("captureSignInDidSucceedForUser:status:")]
    void SignInSucceeded (JRCaptureUser captureUser, JRCaptureRecordStatus captureRecordStatus);
    [Export ("registerUserDidSucceed:")]
    void  RegisterUserSucceeded(JRCaptureUser registeredUser);
    [Export ("refreshAccessTokenDidSucceedWithContext:")]
    void  RefreshAccessTokenSucceeded(NSObject context);
    //- (void)engageAuthenticationDialogDidFailToShowWithError:(NSError *)error
    [Export ("engageAuthenticationDialogDidFailToShowWithError:")]
    void DialogFailedToShow (NSError error);
    //- (void)engageAuthenticationDidFailWithError:(NSError *)error forProvider:(NSString *)provider;
    [Export("engageAuthenticationDidFailWithError:forProvider:")]
    void AuthenticationFailedForProvider (NSError error, NSString provider);
    //- (void)captureSignInDidFailWithError:(NSError *)error;
    [Export("captureSignInDidFailWithError:")]
    void SignInFailed (NSError error);
    //- (void)registerUserDidFailWithError:(NSError *)error;
    [Export("registerUserDidFailWithError:")]
    void RegisterUserFailed (NSError error);
    //- (void)refreshAccessTokenDidFailWithError:(NSError *)error context:(id <NSObject>)context;
    [Export("refreshAccessTokenDidFailWithError:context:")]
    void RefreshAccessTokenFailed (NSError error, NSObject context);
}

除了我遇到了一个特定方法的问题,该方法似乎不想调用我的委托类中的方法之外,它的编译和工作似乎都很好。经过大量的挖掘(并通过艰苦的方式学习Objective-C),我相信我已经解决了这个问题。在我装订的图书馆里,我有这个:

    if ([delegate conformsToProtocol:@protocol(JRCaptureDelegate)] &&
        [delegate respondsToSelector:@selector(captureSignInDidSucceedForUser:status:)])

经过一点DLoging,我发现我的代理未通过conformsToProtocol检查(尽管它确实通过了respondsToSelector检查)。

那么,当conformsToProtocol实现了协议中的所有方法时,为什么我的类会失败呢。我在这里错过了什么?

我的类实现了传递给采用JRCaptureDelegate的各种方法的委托,它看起来像这样:

public class SignIn : JRCaptureDelegate
{
     // overrides for each method
}

好吧,我想我可能已经破解了它。我把Adopts属性添加到了我的类中(在Xamarin文档的各个地方都含糊地提到了这个属性,但在创建绑定库时并没有真正建议这样做)。所以现在我有了这个:

[Adopts("JRCaptureDelegate")] 
public class SignIn : JRCaptureDelegate
{
     // overrides for each method
}

现在它通过了conformsToProtocol检查。我不知道为什么这不是自动的,因为我正在实现JRCaptureDelegate接口/协议。

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