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];
每次都崩溃并出现以下错误:
** 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 mutable dictonary 一起使用。将 KVO 与 NSUserDefaults 一起使用有什么问题吗?顺便说一下,我使用的平台是 iPhone。