AFNetworking 不兼容的块指针类型发送

Question

我正在使用 AFNetworking 通过 Windows 身份验证访问 URL。我正在使用 ASIHTTPRequest 像这样登录：

-(BOOL)User:(NSString *)user andPassWordExists:(NSString *)password
{
    NSURL *url = [NSURL URLWithString:kIP];
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
    [request setUseSessionPersistence:YES];
    [request setUseKeychainPersistence:NO];
    [request setUsername:user];
    [request setPassword:password];
    [request setDomain:@"domain"];
    [request startSynchronous];

    NSError *loginError = [request error];
    if(loginError == nil){
        return true;
    }else{
        return false;
    }

}

现在我正在尝试使用 AFNetworking 做同样的事情，这是我从这个例子中得出的结论：http://www.raywenderlich.com/forums/viewtopic.php?f=2&t=18385

-(BOOL)User:(NSString *)user andPassWordExists:(NSString *)password
{
    NSURL *url = [NSURL URLWithString:kIP];

    NSURLRequest *request = [NSURLRequest requestWithURL:url
                                             cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                                         timeoutInterval:90.0];
    AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc]
                                         initWithRequest:request];
    [operation setCredential:[NSURLCredential credentialWithUser:[@"domain" stringByAppendingString:user]
                                                        password:password persistence:NSURLCredentialPersistenceNone]];
    operation.responseSerializer = [AFJSONResponseSerializer serializer];


    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

        return true;

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        return false;

    }];
    [operation start];
}

但这给了我两个错误：

/Users/jsuske/Documents/SSiPad(Device Only)ios7/SchedulingiPadApplication/Classes/LHJSonData.m:148:46: Incompatible block pointer types sending 'int (^)(AFHTTPRequestOperation *__strong, __strong id)' to parameter of type 'void (^)(AFHTTPRequestOperation *__strong, __strong id)'

/Users/jsuske/Documents/SSiPad(Device Only)ios7/SchedulingiPadApplication/Classes/LHJSonData.m:152:15: Incompatible block pointer types sending 'int (^)(AFHTTPRequestOperation *__strong, NSError *__strong)' to parameter of type 'void (^)(AFHTTPRequestOperation *__strong, NSError *__strong)'

我如何创建一个使用用户和密码登录和存储这些凭据的方法...这可以通过 AFNetworking 实现，它肯定可以通过 ASIHTTPRequest

Answer 1

我觉得你是misunderstanding blocks。您正在从回调块 returning TRUE/FALSE，不是您的方法。这些块将在未来的某个时间点执行，它们的 return 类型是 void。尝试运行此代码以查看顺序：

-(void)User:(NSString *)user andPassWordExists:(NSString *)password
{
    // construct your request

    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        NSLog(@"In success block");
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        NSLog(@"In Fail block");
    }];
    [operation start];

    NSLog(@"Network op started");
}

至于你的设计，我不会 return 是对还是错，你必须找到另一种方法来管理成功和失败的场景，可能看起来像像这样（我对你的整体设计了解不够，无法给出明确的答案）：

-(void)User:(NSString *)user andPassWordExists:(NSString *)password
{
    // construct your request

    __weak typeof(self) weakSelf = self;
    [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
        // called at somepoint in the future if the request is success full
        [weakSelf handleSuccess:responseObject];
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        // called at somepoint in the future if the request fails
        [weakSelf handleFail:error];
    }];
    [operation start];
}

- (void)handleSuccess(id)response {
    // process the response
}

- (void) handleFail:(NSError*)error {
    // evaluate error
}

您在此处看到块声明：https://github.com/AFNetworking/AFNetworking/blob/master/AFNetworking/AFHTTPRequestOperation.h

AFNetworking 不兼容的块指针类型发送

AFNetworking Incompatible block pointer types sending

objective-c

asihttprequest

ios

afnetworking