ios – [__NSArrayM objectForKeyedSubscript：]：无法识别的选择器发送到实例 – 附带源代码和截图

概述在 GitHub,我有 a simple iPhone app,它从社交网络Mail.ru获取用户信息(通过使用OAuth)： 它确实获取并打印信息,但随后崩溃. 作为一个iOS编程新手,我对下面的输出感到困惑(也请看the full output at PasteBin)： 2014-01-21 21:21:10.873 oauthMailru[8228:3307] -[__NSArrayM o 在 GitHub,我有 a simple iPhone app,它从社交网络Mail.ru获取用户信息(通过使用OAuth)：

它确实获取并打印信息,但随后崩溃.

作为一个iOS编程新手,我对下面的输出感到困惑(也请看the full output at PasteBin)：

2014-01-21 21:21:10.873 oauthMailru[8228:3307] -[__NSArrayM objectForKeyedSubscript:]: unrecognized selector sent to instance 0x8a972902014-01-21 21:21:10.875 oauthMailru[8228:3307] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[__NSArrayM objectForKeyedSubscript:]: unrecognized selector sent to instance 0x8a97290'*** First throw call stack:(    0   CoreFoundation                      0x01aa65e4 __exceptionPreprocess + 180    1   libobjc.A.dylib                     0x018298b6 objc_exception_throw + 44    2   CoreFoundation                      0x01b43903 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275    3   CoreFoundation                      0x01a9690b ___forwarding___ + 1019    4   CoreFoundation                      0x01a964ee _CF_forwarding_prep_0 + 14    5   oauthMailru                         0x00003a62 __47-[VIEwController fetchMailruWithToken:ForUser:]_block_invoke + 402    6   Foundation                          0x01545695 __67+[NSURLConnection sendAsynchronousRequest:queue:completionHandler:]_block_invoke_2 + 151    7   Foundation                          0x014a5945 -[NSBlockOperation main] + 88    8   Foundation                          0x014fe829 -[__NSOperationInternal _start:] + 671    9   Foundation                          0x0147b558 -[NSOperation start] + 83    10  Foundation                          0x01500af4 __NSOQSchedule_f + 62    11  libdispatch.dylib                   0x021344b0 _dispatch_clIEnt_callout + 14    12  libdispatch.dylib                   0x02121018 _dispatch_async_redirect_invoke + 202    13  libdispatch.dylib                   0x021344b0 _dispatch_clIEnt_callout + 14    14  libdispatch.dylib                   0x02122eeb _dispatch_root_queue_drain + 287    15  libdispatch.dylib                   0x02123137 _dispatch_worker_thread2 + 39    16  libsystem_pthread.dylib             0x024c0dab _pthread_wqthread + 336    17  libsystem_pthread.dylib             0x024c4cce start_wqthread + 30)libc++abi.dylib: terminating with uncaught exception of type NSException

有谁请知道发生了什么以及如何阅读此类崩溃？

我的源文件：ViewController.m,显示UIWebVIEw,然后转到DetailViewController.m

解决方法 您的代码认为JsON反序列化为对象(字典),但实际上它反序列化为包含一个对象的数组.试试这个：

NSMutableArray *topLevelArray = [NSJsONSerialization JsONObjectWithData:data     options:NSJsONReadingMutableContainers error:nil]; NSDictionary *dict = topLevelArray[0];

如果你想检查你得到的是什么,你可以使用isKindOfClass：像这样：

ID Jso = [NSJsONSerialization JsONObjectWithData:data    options:NSJsONReadingMutableContainers error:nil];if (Jso == nil) {    // Error.  You should probably have passed an NSError ** as the error    // argument so you Could log it.} else if ([Jso isKindOfClass:[NSArray class]]) {    NSArray *array = Jso;    // process array elements} else if ([Jso isKindOfClass:[NSDictionary class]]) {    NSDictionary *dict = Jso;    // process dictionary elements} else {    // Shouldn't happen unless you use the NSJsONReadingallowFragments flag.}

总结

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