为什么我不能在NSUserDefaults中存储NSDictionary？

我试图将NSDictionary存储到NSUserDefaults。但我这样做得到一个崩溃：为什么我不能在NSUserDefaults中存储NSDictionary？

代码：

NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) { 

      NSLog(@"response is %@",response); 
      NSLog(@"erros is %@",error); 

      NSDictionary* jsonDic = [NSJSONSerialization JSONObjectWithData:data 
                    options:kNilOptions 
                     error:&error]; 

      NSLog(@"json is %@",jsonDic); 

      [[NSUserDefaults standardUserDefaults]setObject:jsonDic forKey:@"LoginResult"]; 
      [[NSUserDefaults standardUserDefaults]synchronize]; 


       });

调试：PO jsonDic

{ 
    email = "[email protected]"; 
    "first_name" = teja; 
    "last_name" = nvm; 
    phone = 54321456; 
    "profile_image" = "<null>"; 
    role = User; 
    success = 1; 
    token = 0971994f904780d2c7532da0560c54ca; 
    type = "AUTH_SUCCESS"; 
}

崩溃日志：

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attempt to insert non-property list object <CFBasicHash 0x7a864060 [0x14e8098]>{type = immutable dict, count = 9, 
entries => 
    2 : <CFString 0x7a8630a0 [0x14e8098]>{contents = "type"} = <CFString 0x7a863ae0 [0x14e8098]>{contents = "AUTH_SUCCESS"} 
    3 : <CFString 0x7a862ff0 [0x14e8098]>{contents = "first_name"} = <CFString 0x7a863010 [0x14e8098]>{contents = "teja"} 
    4 : <CFString 0x7a863ff0 [0x14e8098]>{contents = "phone"} = <CFString 0x7a864000 [0x14e8098]>{contents = "54321456"} 
    5 : <CFString 0x7a8642b0 [0x14e8098]>{contents = "success"} = <CFBoolean 0x14e8650 [0x14e8098]>{value = true} 
    6 : <CFString 0x7a863fd0 [0x14e8098]>{contents = "last_name"} = <CFString 0x7a863020 [0x14e8098]>{contents = "nvm"} 
    7 : <CFString 0x7a8630b0 [0x14e8098]>{contents = "token"} = <CFString 0x7a862f90 [0x14e8098]>{contents = "0971994f904780d2c7532da0560c54ca"} 
    8 : <CFString 0x7a862fc0 [0x14e8098]>{contents = "email"} = <CFString 0x7a862fd0 [0x14e8098]>{contents = "[email protected]"} 
    9 : <CFString 0x7a864040 [0x14e8098]>{contents = "profile_image"} = <CFNull 0x14e8238 [0x14e8098]> 
    10 : <CFString 0x7a864020 [0x14e8098]>{contents = "role"} = <CFString 0x7a864030 [0x14e8098]>{contents = "User"} 
} 
for key LoginResult' 
*** First throw call stack: 
(
    0 CoreFoundation      0x012bea14 __exceptionPreprocess + 180 
    1 libobjc.A.dylib      0x009e1e02 objc_exception_throw + 50 
    2 CoreFoundation      0x012be93d +[NSException raise:format:] + 141 
    3 CoreFoundation      0x01278844 _CFPrefsValidateValueForKey + 164 
    4 CoreFoundation      0x012c1b0d -[CFPrefsPlistSource sendMessageSettingValue:forKey:] + 253 
    5 CoreFoundation      0x011e56a7 -[CFPrefsPlistSource alreadylocked_setValue:forKey:] + 359 
    6 CoreFoundation      0x011e551e -[CFPrefsSource setValue:forKey:] + 78 
    7 CoreFoundation      0x011e54c3 ___CFPreferencesSetValueWithContainer_block_invoke + 51 
    8 CoreFoundation      0x0119d701 +[CFPrefsSource withSourceForIdentifier:user:byHost:container:perform:] + 1281 
    9 CoreFoundation      0x011e5455 _CFPreferencesSetValueWithContainer + 293 
    10 CoreFoundation      0x012a42a2 _CFPreferencesSetAppValueWithContainer + 66 
    11 Foundation       0x005b88dc -[NSUserDefaults(NSUserDefaults) setObject:forKey:] + 59 
    12 ePersonalHealth Project    0x00084bb3 __30-[LoginViewController Log_in:]_block_invoke + 371 
    13 CFNetwork       0x00192087 __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 48 
    14 CFNetwork       0x001a6153 __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 353 
    15 Foundation       0x0068e96f __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 12 
    16 Foundation       0x005b285f -[NSBlockOperation main] + 108 
    17 Foundation       0x00592ce4 -[__NSOperationInternal _start:] + 697 
    18 Foundation       0x00592a24 -[NSOperation start] + 83 
    19 Foundation       0x00592862 __NSOQSchedule_f + 245 
    20 libdispatch.dylib     0x0357d9cd _dispatch_client_callout + 14 
    21 libdispatch.dylib     0x03561650 _dispatch_queue_drain + 2227 
    22 libdispatch.dylib     0x03560b04 _dispatch_queue_invoke + 570 
    23 libdispatch.dylib     0x035637bb _dispatch_root_queue_drain + 550 
    24 libdispatch.dylib     0x0356358e _dispatch_worker_thread3 + 115 
    25 libsystem_pthread.dylib    0x038a443e _pthread_wqthread + 1050 
    26 libsystem_pthread.dylib    0x038a1f72 start_wqthread + 34 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException

NSDictionary是property-list-object。但为什么它无法保存在用户默认值？

来源

2016-03-02 Teja Nandamuri

“”profile_image“=”“”可能是您问题的根源。 – Larme

所以NSUSerdefaults不存储字典，如果它的任何值为空？ @Larme –

是的，'NSDictionary'是一个属性列表对象。但是为了存储字典，所有的键都必须是'NSString'，所有的值也必须是属性列表对象。 – rmaddy

NSDictionary是属性列表对象。但为了存储字典，所有密钥必须是NSString，并且所有值也必须是属性列表对象。

您的字典中包含profile_image键的非属性列表对象，因为其值为NSNull。

从字典中删除该值，并且您的代码应该工作。当然你的加载字典的代码必须处理密钥不在那里表示它是“空”的可能性。

由于您使用的是NSJSONSerialization，因此您可能会在结果数据中包含多个NSNull值。您需要递归查找并删除任何和所有NSNull值。

来源

2016-03-02 17:55:56 rmaddy

为什么我不能在NSUserDefaults中存储NSDictionary？

回答

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