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POWhy is NSUserDefaults unwilling to save my NSDictionary?
 

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  1. POWhy is NSUserDefaults unwilling to save my NSDictionary?
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    <p>I'm using KVC to serialize an <code>NSObject</code> and attempt to save it to <code>NSUserDefaults</code>, which is giving me an <code>Attempt to insert non-property value</code> when I try to store my <code>NSDictionary</code>.</p> <p>Following are the properties of the object in question, <code>MyClass</code>:</p> <pre><code>@interface MyClass : NSObject @property (copy,nonatomic) NSNumber* value1; @property (copy,nonatomic) NSNumber* value2; @property (copy,nonatomic) NSString* value3; @property (copy,nonatomic) NSString* value4; @property (copy,nonatomic) NSString* value5; @property (copy,nonatomic) NSString* value6; @property (copy,nonatomic) NSString* value7; @property (copy,nonatomic) NSString* value8; @end </code></pre> <p>When it is time to save MyClass it occurs here:</p> <pre><code>-(void)saveMyClass { NSArray* keys = [NSArray arrayWithObjects: @"value1", @"value2", @"value3", @"value4", @"value5", @"value6", @"value7", @"value8", nil]; NSDictionary* dict = [self dictionaryWithValuesForKeys:keys]; for( id key in [dict allKeys] ) { NSLog(@"%@ %@",[key class],[[dict objectForKey:key] class]); } NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults]; [defaults setObject:dict forKey:[NSString stringWithString:kMyClassKey]]; [defaults synchronize]; } </code></pre> <p>which produces this output:</p> <pre><code>2012-02-23 19:35:27.518 MyApp[10230:40b] __NSCFConstantString __NSCFNumber 2012-02-23 19:35:27.519 MyApp[10230:40b] __NSCFConstantString __NSCFNumber 2012-02-23 19:35:27.519 MyApp[10230:40b] __NSCFConstantString __NSCFString 2012-02-23 19:35:27.519 MyApp[10230:40b] __NSCFConstantString __NSCFString 2012-02-23 19:35:27.520 MyApp[10230:40b] __NSCFConstantString __NSCFString 2012-02-23 19:35:27.520 MyApp[10230:40b] __NSCFConstantString __NSCFString 2012-02-23 19:35:27.520 MyApp[10230:40b] __NSCFConstantString __NSCFString 2012-02-23 19:35:27.520 MyApp[10230:40b] __NSCFConstantString NSNull 2012-02-23 18:38:48.489 MyApp[9709:40b] *** -[NSUserDefaults setObject:forKey:]: Attempt to insert non-property value '{ value1 = "http://www.google.com"; value2 = "MyClassData"; value3 = 8; value4 = "&lt;null&gt;"; value5 = "http://www.google.com"; value6 = 1; value7 = "http://www.google.com"; value8 = 4SY8KcTSGeKuKs7s; }' of class '__NSCFDictionary'. Note that dictionaries and arrays in property lists must also contain only property values.` </code></pre> <p>As you can see, all of the objects in the <code>dict</code> are property list values and all of its keys are <code>NSString*</code>. What trivia am I lacking in order to execute this? Or should I give up and use <code>writeToFile</code> or similar?</p>
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    1. USThomson Comer
    1. USThomson Comer
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      1. POWhy is NSUserDefaults unwilling to save my NSDictionary?
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    1. COYou're just printing the keys. What about the values?
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      1. USKevin Ballard
    2. COThat's entirely it, one of my values snuck in as an `NSNull` (JSON `null` produced by `JSONKit`) and that's almost definitely the cause. I haven't worked a solution yet.
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      1. USThomson Comer
 

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