ios - 如何在afnetworking中的AFHTTPRequestOperationManager请求中获得返回

Question

嗨，我正在使用 AFHTTPRequestOperationManager 类从服务器获取响应但无法返回数据发布数据。方法返回首先执行然后成功数据来我想得到返回的值。

这是我的代码
.h 文件

@interface ServerRequest : NSObject
{

}

-(NSString *) JsonData:(NSString *)newparams actionmethod:(NSString *)action parameters:(NSDictionary *)params;

.m

#import "ServerRequest.h"
#import "AFNetworking.h"

@implementation ServerRequest
{



}

-(NSDictionary *) getJsonData:(NSString *)anynewparams 
                 actionmethod:(NSString *)action 
                   parameters:(NSDictionary *)params {

    NSMutableDictionary *json = [[NSMutableDictionary alloc] init];

    NSString *url = @"http://gjkhdhdyi/ghdgd/Rest/";
    url = [url stringByAppendingString:action];

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];

    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];

    manager.requestSerializer = requestSerializer;
    [manager 
    POST:weburl 
    parameters:params
    success:^(AFHTTPRequestOperation *operation, id responseObject) {

         NSLog(@"JSON: %@", responseObject);
         json=responseObject;
         // here i am getting data 

    }

    failure:^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Error: %@", error);

    }];

    return json;    
}

现在我在导入这个之后在我的 ViewController 类中调用这个方法，我这样调用

ServerRequest *servercall=[[ServerRequest alloc]init];
returninfo=[servercall getJsonData:nil actionmethod:@"loginuser?" parameters:inputs]
// here i want return data.

问题在这里没有得到返回。但在我得到的方法中。那么请求成功后如何获取json数据，如何做到这一点

Answer 1

您的请求方法使用 block ，它不会立即执行，而是被调度/调度，因此该方法在请求完成之前返回(因此 nil 值)您可以重构您的方法以使用成功/错误 block :

.h 文件

-(void)getJsonData:(NSString *)anynewparams 
  actionmethod:(NSString *)action 
    parameters:(NSDictionary *)params 
    onComplete:(void (^)(NSDictionary *json))successBlock 
       onError:(void (^)(NSError *error))errorBlock;

.m 文件

-(void)getJsonData:(NSString *)anynewparams 
      actionmethod:(NSString *)action 
        parameters:(NSDictionary *)params 
        onComplete:(void (^)(NSDictionary *json))successBlock 
           onError:(void (^)(NSError *error))errorBlock {

    NSString *url = @"http://gjkhdhdyi/ghdgd/Rest/";
    url = [url stringByAppendingString:action];

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
    AFJSONRequestSerializer *requestSerializer = [AFJSONRequestSerializer serializer];

    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    [requestSerializer setValue:@"application/json" forHTTPHeaderField:@"Accept"];

    manager.requestSerializer = requestSerializer;

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

         NSLog(@"JSON: %@", responseObject);
         successBlock(responseObject);
     }

    failure: ^(AFHTTPRequestOperation *operation, NSError *error) {
         NSLog(@"Error: %@", error);
         errorBlock(error);
     }];
}

后来:

ServerRequest *servercall=[[ServerRequest alloc] init];
[servercall getJsonData:nil actionmethod:@"loginuser?" parameters:inputs onComplete:^(NSDictionary *json) {

    // return json ehre
} onError:^(NSError *error) {

    // handle error here
}];