使用方法setValue:forPath时NSInserInconsistencyException与NSUserDefaults

时间:2011-05-23 16:41:30

标签: iphone nsuserdefaults setvalue

我的代码如下:

NSMutableDictionary *configure = [[NSUserDefaults standardUserDefaults] objectForKey:@"configure"];
if (!configure){    
configure = [NSMutableDictionary dictionary];
[configure setValue:[NSMutableDictionary dictionary] forKeyPath:@"select"] ;

[configure setValue:[NSMutableDictionary dictionary] forKeyPath:@"select.around"];
[configure setValue: @"All" forKeyPath:@"select.around.name"];

[[NSUserDefaults standardUserDefaults] setObject:configure forKey:@"configure"];
[[NSUserDefaults standardUserDefaults] synchronize];
    }
NSString *keyPath = @"configure.select.around";
NSMutableDictionary *aroundConfigure = [[[NSUserDefaults standardUserDefaults] valueForKeyPath:keyPath] mutableCopy];
[aroundConfigure setObject:@"" forKey:@"name"];
[[NSUserDefaults standardUserDefaults] setValue:aroundConfigure forKeyPath:keyPath];

每次出现以下错误都会崩溃:

** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[__NSCFDictionary setObject:forKey:]: mutating method sent to immutable object'
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00daebe9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x00f035c2 objc_exception_throw + 47
    2   CoreFoundation                      0x00d67628 +[NSException raise:format:arguments:] + 136
    3   CoreFoundation                      0x00d6759a +[NSException raise:format:] + 58
    4   CoreFoundation                      0x00dad401 -[__NSCFDictionary setObject:forKey:] + 209
    5   Foundation                          0x0004b34d -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 399
    6   Foundation                          0x0004b34d -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 399
    7   Untitled                            0x00002429 -[UntitledAppDelegate application:didFinishLaunchingWithOptions:] + 774
    8   UIKit                               0x002b81fa -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
    9   UIKit                               0x002ba55e -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 439
    10  UIKit                               0x002c4db2 -[UIApplication handleEvent:withNewEvent:] + 1533
    11  UIKit                               0x002bd202 -[UIApplication sendEvent:] + 71
    12  UIKit                               0x002c2732 _UIApplicationHandleEvent + 7576
    13  GraphicsServices                    0x016e4a36 PurpleEventCallback + 1550
    14  CoreFoundation                      0x00d90064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
    15  CoreFoundation                      0x00cf06f7 __CFRunLoopDoSource1 + 215
    16  CoreFoundation                      0x00ced983 __CFRunLoopRun + 979
    17  CoreFoundation                      0x00ced240 CFRunLoopRunSpecific + 208
    18  CoreFoundation                      0x00ced161 CFRunLoopRunInMode + 97
    19  UIKit                               0x002b9fa8 -[UIApplication _run] + 636
    20  UIKit                               0x002c642e UIApplicationMain + 1160
    21  Untitled                            0x00002100 main + 102
    22  Untitled                            0x00002091 start + 53
)
terminate called after throwing an instance of 'NSException'

我知道setObject:forKey:应该与可变的dictonary一起使用。使用KVO和NSUserDefaults有什么问题吗?顺便说一句,我使用的平台是iPhone。

3 个答案:

答案 0 :(得分:2)

您的代码没有按照您的想法行事:

NSMutableDictionary *configure = [[NSUserDefaults standardUserDefaults] objectForKey:@"configure"];

这会将configure设置为您的标准默认值的值configure

configure = [NSMutableDictionary dictionary];

这会将configure设置为新的空字典,而不是您从用户默认设置中获得的字典

[configure setValue:[NSMutableDictionary dictionary] forKeyPath:@"select"] ;

现在,您将一个空字典作为键select

的值
[configure setValue:[NSMutableDictionary dictionary] forKeyPath:@"select.around"];

您正在为此关键路径添加另一个空字典

[configure setValue: @"All" forKeyPath:@"select.around.name"];

您正在为此关键路径设置字符串值

[[NSUserDefaults standardUserDefaults] setObject:configure forKey:@"configure"];

您现在将这个奇怪的字典放入NSUserDefaults

[[NSUserDefaults standardUserDefaults] synchronize];

NSString *keyPath = @"configure.select.around";

NSMutableDictionary *aroundConfigure = [[[NSUserDefaults standardUserDefaults] valueForKeyPath:keyPath] mutableCopy];

这只是一个空的可变字典

[aroundConfigure setObject:@"" forKey:@"name"];

您要为此词典中的某个键设置空字符串

[[NSUserDefaults standardUserDefaults] setValue:aroundConfigure forKeyPath:keyPath];

然后将这个奇怪的字典设置为用户默认值。

这一切都非常混乱。

你想做什么?

已编辑添加

如果你“简化”它就没有必要提供代码我们无法看到它应该做什么。

您的应用程序崩溃了,因为您正在尝试更改NSDictionary的键值对,该键值对是不可变的而不是NSMutableDictionary。请参阅跟踪的第6行。

由于您提供了“简化”代码 - 我不知道您在做什么。

答案 1 :(得分:0)

今天我也遇到了这个问题,因为我在这样的字典中制作数据

NSMutableDictionary *Dic =[myMutableAry objectAtIndex:0];  

获取数据后我更新我的dic值然后崩溃

  

* 由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序,原因:' - [__ NSCFDictionary   setObject:forKey:]:发送到不可变对象'

的mutating方法

然后我经过大量的研究后得到了解决方案,所以只做一件事

NSMutableDictionary *Dic = [NSMutableDictionary dictionaryWithDictionary:[myMutableAry objectAtIndex:0]];

答案 2 :(得分:0)

您使用NSUserDefaults的方式是错误的,NSUserDefaults返回一个不可变的字典。这就是这个问题的原因。因此,您必须从NSUserDefaults明确请求可变对象。请使用下面的代码行。

NSMutableDictionary *configure = [[[NSUserDefaults standardUserDefaults] objectForKey:@"configure"]mutableCopy];

这项工作与我同在。 谢谢你好运:))