Ios 获得；已将无法识别的选择器发送到实例"；

我试图用以下代码解析JSON对象：

 NSDictionary *res = [NSJSONSerialization JSONObjectWithData:_responseData options:NSJSONReadingMutableLeaves error:&myError];

NSArray *test = [res allValues];
@NSLog(@"%@", test);

虽然我知道这些值如下所示，但我一直收到此错误：

2014-07-25 22:31:17.652 Application[18009:60b] (
    {
    "at_tag" = sam;
    category = 1;
    distance = "95.60";
    "hash_tag" = idk;
    uid = 1;
    vidURI = "http://server/userPosts/avfgt123.mp4";
},
    {
    "at_tag" = nick;
    category = 2;
    distance = "99.45";
    "hash_tag" = irdk;
    uid = 2;
    vidURI = "http://server/userPosts/avfg2223.mp4";
}
)

我得到的全部错误是：

2014-07-25 22:33:13.829 App[18025:60b] -[__NSCFArray allValues]: unrecognized selector sent to instance 0x10d90c0d0
2014-07-25 22:33:13.831 App[18025:60b] *** Terminating app due to uncaught exception   'NSInvalidArgumentException', reason: '-[__NSCFArray allValues]: unrecognized selector sent to   instance 0x10d90c0d0'
*** First throw call stack:
(
0   CoreFoundation                      0x0000000102477495 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x00000001021d699e objc_exception_throw + 43
2   CoreFoundation                      0x000000010250865d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3   CoreFoundation                      0x0000000102468d8d ___forwarding___ + 973
4   CoreFoundation                      0x0000000102468938 _CF_forwarding_prep_0 + 120
5   App                               0x00000001000028a7 -[BFTMainViewController connectionDidFinishLoading:] + 263
6   Foundation                          0x0000000101ec736b __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke + 48
7   Foundation                          0x0000000101d7abdb -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 210
8   Foundation                          0x0000000101d7aaec -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 69
9   CFNetwork                           0x0000000103289637 ___ZN27URLConnectionClient_Classic26_delegate_didFinishLoadingEU13block_pointerFvvE_block_invoke + 107
10  CFNetwork                           0x0000000103287802 ___ZN27URLConnectionClient_Classic18_withDelegateAsyncEPKcU13block_pointerFvP16_CFURLConnectionPK33CFURLConnectionClientCurrent_VMaxE_block_invoke_2 + 84
11  CoreFoundation                      0x000000010241df74 CFArrayApplyFunction + 68
12  CFNetwork                           0x00000001031fa3e7 _ZN19RunloopBlockContext7performEv + 133
13  CFNetwork                           0x00000001031fa217 _ZN17MultiplexerSource7performEv + 247
14  CFNetwork                           0x00000001031fa03a _ZN17MultiplexerSource8_performEPv + 72
15  CoreFoundation                      0x0000000102406d21 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
16  CoreFoundation                      0x00000001024065f2 __CFRunLoopDoSources0 + 242
17  CoreFoundation                      0x000000010242246f __CFRunLoopRun + 767
18  CoreFoundation                      0x0000000102421d83 CFRunLoopRunSpecific + 467
19  GraphicsServices                    0x0000000103cf2f04 GSEventRunModal + 161
20  UIKit                               0x0000000100d83e33 UIApplicationMain + 1010
21  App                               0x0000000100001693 main + 115
22  libdyld.dylib                       0x00000001039745fd start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

我在第行收到错误：

NSArray *test = [res allValues];

---

这让我困惑了很长一段时间，我觉得这很简单，我以前从来没有遇到过这个问题，也无法对此加以解释。

正如我上面的评论所建议的：你的问题表明你的JSON对象实际上是一个

NSArray

的

NSDictionaries

（我认为基于控制台输出，如果我错了，请告诉我），因此

allValues

方法将不起作用，因为根对象不是

NSDictionary

。Aka:

No visible@interface for NSArray声明选择器allValues

尝试以下操作：

NSArray *jsonArray = [NSJSONSerialization JSONObjectWithData:_responseData options:NSJSONReadingMutableLeaves error:&myError];

NSMutableArray *mutableArray = [[NSMutableArray alloc]init];

for (NSDictionary *sub in jsonArray)
{
    [mutableArray addObjectsFromArray:[sub allValues]];
}

NSLog(@"Array is: %@",mutableArray);

---

您的问题表明，您的JSON对象实际上是

NSDictionary

的

NSArray

，因此

allValues

将不起作用，因为根对象不是

NSDictionary

。Aka:

No visible@interface for'NSArray'声明选择器“allValues”