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    <p>If you only store standard objects inside the dictionary like NSData, NSString, NSNumber, NSDate, NSArray, NSDictionary or a combination of them you don't have to do anything special. </p> <p>However, if you have instances of custom objects in it (i.e. classes that you've created) you first need to convert it into a compatible type (e.g. <code>NSData</code>). You can do this using the code below:</p> <pre><code>NSData* data=[NSKeyedArchiver archivedDataWithRootObject:json]; [NSUserDefaults standardUserDefaults] setObject:data forKey:@"user"] </code></pre> <p>For this method to work, you ned to implement these 2 methods in the custom classes you are trying to save:</p> <pre><code>- (id)initWithCoder:(NSCoder*)coder - (void)encodeWithCoder:(NSCoder*)coder; </code></pre> <p>To get the dictionary back from NSUserDefaults (decode) you can use:</p> <pre><code>NSData* data = [[NSUserDefaults standardUserDefaults] objectForKey:@"user"]; NSDictionary* json = [NSKeyedUnarchiver unarchiveObjectWithData:data]; </code></pre> <p><strong>EDIT</strong></p> <p>To check if your <code>json</code> object contains any <code>[NSNull null]</code> values, add this piece of code before you are making your insert into <code>NSUserDefaults</code></p> <pre><code>for (id val in [json allValues]) { if ([val isKindOfClass:[NSNull class]]) { NSLog(@"This bad! NSNull should not be in the dictionary"); break; } } </code></pre> <p>If you get any <code>This is bad...</code> messages in the console, then you have 2 choices. 1. Use the archiving/unarchiving method I described above 2. Replace the <code>NSNull</code> objects from the dictionary with other values (e.g. empty strings) if this does not break your code.</p>
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    1. POSaving NSdictionary in NSUserDefaults
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    1. USAndrei Stanescu
    1. USAndrei Stanescu
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    1. COupdated my answer
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    2. COwhere do I put initWithCoder and encodeWithCoder? The items in the nsdictionary are NSStrings. thanks.
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    3. COif the items are NSString then you shouldn't worry about it. Those 2 methods are used only if you store custom classes that you created. Like others suggested, check that json does not contain any [NSNull null] values. I will edit my post with an example code to do this.
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