iphone - 使用 AFJSONRequestOperation 返回 JSON

Question

我已经实现了 AFNetworking 框架，但是我试图找出一种在单独的类中使用 AFJSONRequestOperation 函数并从我的个人 View Controller 调用它的方法。

我所做的是创建一个类方法，它采用字典中的参数和 web 服务 url。我希望这能够从成功 block 返回 JSON 数组和 Http 代码，但这不起作用。

如果我将公共(public)函数更改为具有返回类型并在方法末尾返回一个值，它会在成功 block 完成之前返回。

有什么建议吗？

+ (void)RequestJSON:(NSDictionary *)params:(NSString *)webServicePath {

    NSURL *url = [NSURL URLWithString:@"http://api.website.com/"];

    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:webServicePath parameters:params];
    NSLog(@"%@", request);

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request

    success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
                                         {

                                           NSString *httpCode = [[JSON valueForKey:@"meta"]valueForKey:@"code"];
                                             NSLog(@"code=%@", httpCode);

                                         }

    failure:^(NSURLRequest *request , NSURLResponse *response , NSError *error , id JSON)
                                         {
                                             NSLog(@"Failed: %@",[error localizedDescription]);

                                         }];
    [operation start];

}

Answer 1

根据其他用户的推荐，我最终创建了自己的委托(delegate)，它在成功和失败方法中执行两个选择器 didReceiveJSON 和 didNotReceiveJSON。

编辑:这是我的代码:)

JSONRequest.h

#import <Foundation/Foundation.h>

@class JSONRequest;

@protocol JSONRequest <NSObject>

- (void)didReceiveJSONResponse:(NSDictionary*)JSONResponse;
- (void)didNotReceiveJSONResponse;

@end

@interface JSONRequest : NSObject {

    id <JSONRequest> delegate;
}

@property (strong, nonatomic) id <JSONRequest> delegate;

- (void)RequestJSON:(NSDictionary* )params:(NSString*)webServicePath;

@end

JSONRequest.m

#import "JSONRequest.h"
#import "AFHTTPClient.h"
#import "AFJSONRequestOperation.h"

@implementation JSONRequest
@synthesize delegate;

- (void)RequestJSON:(NSDictionary *)params:(NSString *)webServicePath {

    NSURL *url = [NSURL URLWithString:@"http://api.mysite.com"];

    AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:url];

    NSMutableURLRequest *request = [httpClient requestWithMethod:@"POST" path:webServicePath parameters:params];
    NSLog(@"%@", request);

    AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request

    success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON)
                                         {
                                             NSDictionary *jsonDictionary = JSON;
                                             [delegate performSelector:@selector(didReceiveJSONResponse:) withObject:jsonDictionary];
                                         }

    failure:^(NSURLRequest *request , NSURLResponse *response , NSError *error , id JSON)
                                         {
                                             NSLog(@"Failed: %@",[error localizedDescription]);
                                             [delegate performSelector:@selector(didNotReceiveJSONResponse)];

                                         }];
    [operation start];

}

@结束