将 json 解析为 NSDictionary 无法正确保存

Question

        NSMutableURLRequest *request = [[NSMutableURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
        [request setHTTPMethod:@"GET"];
        NSString *str =[NSString stringWithFormat:@""];
        NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
        [request setHTTPBody:data];
        NSError *error;
        NSData *received = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
        NSDictionary *currencyDic = [NSJSONSerialization JSONObjectWithData:received options:NSJSONReadingMutableContainers error:&error];

我想保存json到currencyDic，但有些数据无法在键上保存

杰森：

{
    "data": [
        {
            "USD2JPY": 106.544998,
            "USD2SGD_ts": 1465039761,
            "USD2ITL_ts": 1434960300,
            "USD2FRF": 5.7601,
            "USD2GBP": 0.688942,
            "USD2MOP_ts": 1464990701,
            "USD2CHF": 0.975795,
            "USD2AUD_ts": 1465039761,
            "USD2EUR_ts": 1465039761,
            "USD2EUR": 0.879817,
            "USD2CNY_ts": 1465039761,
            "USD2HKD_ts": 1465039761,
            "USD2CAD_ts": 1465039761,
            "USD2ITL": 1700.272217,
            "USD2CHF_ts": 1465039761,
            "USD2DEM": 1.71745,
            "USD2DEM_ts": 1434958500,
            "USD2GBP_ts": 1465039761,
            "USD2JPY_ts": 1465039761,
            "USD2HKD": 7.7678,
            "USD2FRF_ts": 1434958260,
            "USD2CNY": 6.56645,
            "DATA_ts": 1465116640,
            "USD2AUD": 1.357589,
            "USD2MOP": 8.00155,
            "USD2CAD": 1.2938,
            "USD2SGD": 1.35655
        }
    ],
    "status": "ok"
}  

我使用 Xcode 手表值

    currencyDic __NSDictionaryM *   2 key/value pairs   0x00007fc7ac35c110
    [0] (null)  (no summary) : (no summary) 
    [1] (null)  (no summary) : @"1 element" 
    key NSTaggedPointerString * 0xd Dx16Fx17x06xa0
    value   __NSArrayM *    @"1 element"    0x00007fc7ac35c0e0
    [0] __NSDictionaryM *   27 key/value pairs  0x00007fc7ac35c0b0
    [0] (null)  (no summary) : (double)0.975795 
    key NSTaggedPointerString * 0x0 W5E$3x84dxa4
    value   __NSCFNumber *  (double)0.975795    0x00007fc7ac330400
    [1] (null)  @"USD2JPY_ts" : (long)1465039761    
    [2] (null)  @"USD2FRF_ts" : (long)1434958260    
    key __NSCFString *  @"USD2FRF_ts"   xf0xbf5xacxc7x7f
    value   __NSCFNumber *  (long)1434958260    0xb0000005587b9b43
        ........

像"USD2JPY"这样的所有字符串都无法解析，只能"没有摘要"，但"USD2SGD_ts"可以保存到NSDictionary中。 我尝试更改选项（NSJSONReadingMutableContainers）， NSJSONReadingMutableLeaves ， NSJSONReadingAllowFragments ）这是行不通的。
如何解决？谢谢

Answer 1

Xcode 使用-debugDescription来打印对象。其中有一些优化，以防止打印输出太长。打印为"（无摘要）"的内容只是类NSTaggedPointerString的字符串。但它们是有效的字符串。

您应该为此提交错误。