基於AFNetworking響應的返回值

Question

我想創建一個函數，它將根據AFNetworking POST請求的響應返回一個值。

但是，我不能找出一種方法來做到這一點，因爲函數是異步的，所以在實際收到響應之前返回值。

int didLogin; 

__block NSString *response; 

AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager]; 
    manager.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/html"]; 

    NSDictionary *parameters = @{@"username":username, @"password":password}; 

    [manager POST:loginUrl parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) { 

     //json "response" object from server response 
     response = [responseObject objectForKey:@"response"]; 

     NSLog(@"Response: %@", response); 

     [HUD hide:YES]; 
     [HUD removeFromSuperViewOnHide]; 

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) { 
     [HUD hide:YES]; 
     [HUD removeFromSuperViewOnHide]; 

     NSLog(@"Login Error: %@", error); 
    }]; 

    if ([response compare:@"1"] == NSOrderedSame || [response compare:@"2"] == NSOrderedSame) 
    { 
     //successful login/1-new device/2-existing device 
     didLogin = 1; 
    } 
    else if ([response compare:@"0"] == NSOrderedSame) 
    { 
     //unsuccessful login/invalid password 
     didLogin = 0; 
    } 
    else{ 
     //unsuccessful login 
     didLogin = 2; 
    } 

在哪一點它將返回didLogin。

有什麼辦法可以使這項工作，還是我需要使用同步請求？

Answer 1

您的方法應該將回調塊作爲參數，然後您應該在異步過程完成時使用didLogin調用該塊。您需要擁抱您在代碼中嘗試執行的異步特性。