iOS7 NSURLConnection sendAsynchronousRequest因POST数据失败

我的问题是在iOS7上采用[NSURLConnection sendAsynchronousRequest...]withPOST方法失败，但在iOS6环境上失败。

其他信息：

1. 在我的iOS6环境中，可以像这样从Server获取JSON数据。（成功）

   {
       "status": 200,
       "data": [
           {
               "oauth_token": "BVgOa01tg6JvfuXOPoJS8wB26TpvAaDs"
           }
       ]
   }
   

2. iOS7上的相同代码将收到此错误消息。（失败）

   错误：错误域= NSCocoaErrorDomain代码= 3840“操作无法完成。（可可错误3840。）”（无值。）

3. 我检查了服务器端的PHP代码，发现服务器可以从iOS6 POST数据中获取数据，但不能从iOS7中获取POST数据。（相同的代码结果不同，很奇怪。）

有没有人可以帮助我或为我提供建议？多谢。

我的代码如下（已更新至v3，成功）（感谢Rob'Answer）

- (void) apiLogin
{
    NSDictionary *params = @{@"client_id"     : @"1234567",
                         @"response_type" : @"token",
                         @"redirect_uri"  : @"/oauth2-php/server/examples/pdo/",
                         @"state"         : @"test_state",
                         @"scope"         : @"",
                         @"accept"        : @"Yep",
                         @"uid"           : uid,
                         @"pwd"           : withPwd};

    NSData *postDataString = [self dataForHTTPPost:params];

    // Server API 位置
    NSURL *url=[NSURL URLWithString:@"http://xxx.xxx.tw/xxx.php"];
    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:120];
    [request setURL:url];

    // Solution3:
    NSString *postLength = [NSString stringWithFormat:@"%d", [postDataString length]];
    [request setHTTPMethod:@"POST"];
    [request setValue:postLength forHTTPHeaderField:@"Content-Length"];
    [request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
    [request setHTTPBody:postDataString];

    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue currentQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {

        NSInteger responseCode = [(NSHTTPURLResponse *)response statusCode];
        NSLog(@"D1: responseCode: %d", responseCode);
        if (!connectionError && responseCode == 200) {
            // 採用Apple官方方法將 來源轉成JSON Format並交由NSDictionary 接手.
            NSError *localError = nil;
            NSLog(@"data:%@", data);
            NSDictionary *allInDic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:&localError];
            NSLog(@"Source:%@", allInDic);
            NSLog(@"error:%@", localError);

            // 取出oauth_token資料
            if ([[allInDic objectForKey:@"status"] integerValue] == 200) {

                // 將新取得之 oauth_token 寫入DB
                NSArray * dataArray = [allInDic objectForKey:@"data"];
                NSDictionary *responseData = [dataArray objectAtIndex:0];

                NSString *t = [responseData objectForKey:@"oauth_token"];
                [helper setDbOauthToken:nil :t :TABLE_USER_PROFILES];
                NSLog(@"(API-New)oauth_token:%@", t);
            } else
            {
              NSLog(@"connectionError=%@", connectionError);
              NSLog(@"responseCode=%d", responseCode);
            }
        }
    }];
}

- (NSData *)dataForHTTPPost:(NSDictionary*) parms
{
    NSMutableArray *array = [NSMutableArray array];
    for (NSString *key in parms) {
        id obj = [parms objectForKey:key];
        NSString *valueString;

        if ([obj isKindOfClass:[NSString class]])
          valueString = obj;
        else if ([obj isKindOfClass:[NSNumber class]])
          valueString = [(NSNumber *)obj stringValue];
        else if ([obj isKindOfClass:[NSURL class]])
          valueString = [(NSURL *)obj absoluteString];
        else
          valueString = [obj description];

        [array addObject:[NSString stringWithFormat:@"%@=%@", key, valueString]];
    }
    NSString *postString = [array componentsJoinedByString:@"&"];
    NSLog(@"New2a HTTPPost Data:%@", postString);

    return [postString dataUsingEncoding:NSUTF8StringEncoding];
}

- (IBAction)loginAction:(id)sender {

    [self apiLogin];
}

以下代码是iOS6上的调试输出

New2a HTTPPost Data:response_type=token&uid=xxx&accept=Yep&scope=&client_id=1234567&state=test_state&redirect_uri=/oauth2-php/server/examples/pdo/&pwd=xxx
D1: responseCode: 200
data:<7b227374 61747573 223a3230 302c2264 61746122 3a5b7b22 6f617574 685f746f 6b656e22 3a224870 47366546 4b304a37 38434343 54306352 506e4d77 62544d5c 2f455631 32793422 7d5d7d>
Source:{
    data =     (
                {
            "oauth_token" = "HpG6eFK0J78CCCT0cRPnMwbTM/EV12y4";
        }
    );
    status = 200;
}
error:(null)
(API-New)oauth_token:HpG6eFK0J78CCCT0cRPnMwbTM/EV12y4

下面的代码是iOS7上的调试输出

New2a HTTPPost Data:response_type=token&uid=&accept=Yep&scope=&client_id=1234567&state=test_state&redirect_uri=/oauth2-php/server/examples/pdo/&pwd=
D1: responseCode: 200
data:<>
Source:(null)
error:Error Domain=NSCocoaErrorDomain Code=3840 "The operation couldn’t be completed. (Cocoa error 3840.)" (No value.) UserInfo=0x8a28d90 {NSDebugDescription=No value.}
connectionError=(null)
responseCode=200

感谢Rob的大力帮助，“我的问题”已解决。根目录是下面的代码。在IOS6中，当“ idField.txt”字段上没有输入时，我可以获得uid / withPwd默认值。但是在iOS7中，此代码无法使用（uid / withPwd）获得默认值。谢谢罗伯，我的问题解决了。

NSString *uid = idField.text;
NSString *withPwd = pwdField.text;

// For testing Account ID
if (!uid||!withPwd) {
    uid=@"[email protected]";
    withPwd=@"xxxx";
}
NSLog(@"uid:%@ , pwd:%@", uid, withPwd);

将问题代码更新为可以在iOS6和iOS7上正常工作

// For testing Account ID
if ([uid isEqualToString:@""] || [withPwd isEqualToString:@""] ) {
    uid=@"[email protected]";
    withPwd=@"xxxx";
}