Iphone 使用AFJSONRequestOperation
我试图从提供JSON的web服务中获取一些数据。但我不知道我的代码出了什么问题。它看起来很简单,但我无法获得任何数据 这是代码:Iphone 使用AFJSONRequestOperation,iphone,objective-c,ios,json,afnetworking,Iphone,Objective C,Ios,Json,Afnetworking,我试图从提供JSON的web服务中获取一些数据。但我不知道我的代码出了什么问题。它看起来很简单,但我无法获得任何数据 这是代码: NSURLRequest *request = [NSURLRequest requestWithURL:URL]; AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLReq
NSURLRequest *request = [NSURLRequest requestWithURL:URL];
AFJSONRequestOperation *operation = [AFJSONRequestOperation
JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
DumpDic = (NSDictionary*)[JSON valueForKeyPath:@"description"] ;
}
failure:nil
];
[operation start];
AboutTXT = [DumpDic objectForKey:@"description"];
这是你的电话号码
编辑
来自URL的JSON:
{
"clazz":"AboutList",
"description":{
"clazz":"DescriptionContent",
"description":"ASTRO Holdings Sdn. Bhd. (AHSB) Group operates through two holding companies – ASTRO Overseas Limited (AOL) which owns the portfolio of regional investments and ASTRO Malaysia Holdings Sdn Bhd (AMH / ASTRO) for the Malaysian business, which was privatized in 2010 and is currently owned by Usaha Tegas Sdn Bhd/its affiliates, and Khazanah Nasional Berhad."
},
"id":{
"inc":-1096690569,
"machine":1178249826,
"new":false,
"time":1339660115000,
"timeSecond":1339660115
},
"refKey":"AboutList"
}
它是否成功连接到服务器,是否调用了成功块 填写故障块并记录故障块返回的NSError:
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"%@", [error userInfo]);
}
我还有一个建议,我建议使用AFNetwork的AFHTTPClient构建NSURLRequest,它有助于处理各种事情,通常会使事情变得更简单。设置基URL,然后为其提供一个附加到该基URL的路径。大概是这样的:
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:address];
[httpClient setParameterEncoding:AFJSONParameterEncoding];
NSMutableURLRequest *jsonRequest = [httpClient requestWithMethod:@"POST"
path:@"events"
parameters:dict];
AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
DumpDic = [JSON objectFor:@"description"];
AboutTXT = [DumpDic objectForKey:@"description"];
}
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"%@", [error userInfo]);
}];
[operation start];
另外,我建议您只使用objectForKey,而不是使用valueForKeyPath:
[JSON objectForKey:@"description"];
此外,您不应在此处访问DumpDic:
[operation start];
AboutTXT = [DumpDic objectForKey:@"description"];
这是一个异步调用,因此一旦操作开始,DumpDic很可能在从服务器分配数据之前被访问。因此,您正在访问一个可能还不存在的密钥
这应该在成功或失败块中完成。一旦连接完成并且数据准备好使用,就会调用这些块
所以它看起来应该更像这样:
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:address];
[httpClient setParameterEncoding:AFJSONParameterEncoding];
NSMutableURLRequest *jsonRequest = [httpClient requestWithMethod:@"POST"
path:@"events"
parameters:dict];
AFJSONRequestOperation *operation =
[AFJSONRequestOperation JSONRequestOperationWithRequest:request
success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
DumpDic = [JSON objectFor:@"description"];
AboutTXT = [DumpDic objectForKey:@"description"];
}
failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(@"%@", [error userInfo]);
}];
[operation start];