NSJSON系列化"index 1 beyond bounds for empty array"错误

Question

>有时我在此行收到错误"索引 1 超出空数组的界限"

NSData *aData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

这是我的完整代码

+ (NSDictionary *)getJson: (NSString *)strURL parameters:(NSDictionary *)parameters{
    NSData *postData = [NSJSONSerialization dataWithJSONObject:parameters options:0 error:nil];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:strURL]
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:15.0];
    NSDictionary *headers = @{ @"content-type": @"application/json",
                               @"cache-control": @"no-cache",
                               @"postman-token": @"374a4b6f-b660-78f2-78bf-e22cf0156d8d"};
    [request setHTTPMethod:@"POST"];
    [request setAllHTTPHeaderFields:headers];
    [request setHTTPBody:postData];
    NSURLResponse *response;
    NSError *error;
    NSData *aData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];*
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:aData options: NSJSONReadingMutableContainers error:&error];
    return json;
}

有时

我得到错误，有时没有。我不明白 ？请帮助我，谢谢大家。

Answer 1

每当遇到上述错误时，请尝试以下操作：

NSData *aData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
NSDictionary *json = [NSJSONSerialization JSONObjectWithData:aData options: NSJSONReadingMutableContainers error:&error];
if (error)
{
    //1. See what the error says
    NSLog(error.localizedDescription);
    //2. Convert the original data into a string
    NSString *jsonString = [[NSString alloc] initWithData:aData encoding: NSUTF8StringEncoding];
    //Now take this string and validate it as a JSON at a place like http://jsonlint.com/
}

Answer 2

 NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL: url
                                                                cachePolicy: defaultCachePolicy
                                                            timeoutInterval: defaultTimeoutInSeconds];

请使用默认缓存策略更改您的缓存策略并尝试:)