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POBinding protocol fails to pass conformsToProtocol
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  1. POBinding protocol fails to pass conformsToProtocol
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    copied!<p>Using Xamarin to create a binding library for some external code, I've encountered a problem where despite (as far as I can tell) implementing all of the selectors in a protocol, in Obj-C code, my delegate fails to pass a <code>conformsToProtocol</code> check and, as a result, the code doesn't work.</p> <p>Here's what the Objective-C header file looks like (<a href="https://github.com/janrain/jump.ios/blob/master/Janrain/JRCapture/Classes/JRCapture.h" rel="nofollow">https://github.com/janrain/jump.ios/blob/master/Janrain/JRCapture/Classes/JRCapture.h</a>):</p> <pre><code>@protocol JRCaptureDelegate &lt;NSObject&gt; @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 &lt;NSObject&gt;)context; - (void)refreshAccessTokenDidFailWithError:(NSError *)error context:(id &lt;NSObject&gt;)context; @end </code></pre> <p>And here's the part of the <code>ApiDefinition.cs</code> that corresponds to it:</p> <pre><code>[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 &lt;NSObject&gt;)context; [Export("refreshAccessTokenDidFailWithError:context:")] void RefreshAccessTokenFailed (NSError error, NSObject context); } </code></pre> <p>This compiles and appears to work just fine except I was having a problem with one particular method that didn't appear to want to call the methods in my delegate class. After <em>a lot</em> of digging (and learning Objective-C the hard way), I believe I have isolated the problem. In the library I'm binding, I have this:</p> <pre><code> if ([delegate conformsToProtocol:@protocol(JRCaptureDelegate)] &amp;&amp; [delegate respondsToSelector:@selector(captureSignInDidSucceedForUser:status:)]) </code></pre> <p>And with a little <code>DLog</code>ing, I find that my delegate fails the <code>conformsToProtocol</code> check (although it does pass the <code>respondsToSelector</code> check). </p> <p>So why does my class fail <code>conformsToProtocol</code> when it does implement all the methods in the protocol. What am I missing here?</p> <p>My class implementing the delegate that gets passed to the various methods that take a <code>JRCaptureDelegate</code> just looks like this:</p> <pre><code>public class SignIn : JRCaptureDelegate { // overrides for each method } </code></pre>
 

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