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copied!<p>I found out one alternative, before save, I encode the root object (<code>NSArray</code> object) using <code>NSKeyedArchiver</code>, which ends with <code>NSData</code>. Then use UserDefaults save the <code>NSData</code>. </p> <p>When I need the data, I read out the <code>NSData</code>, and use <code>NSKeyedUnarchiver</code> to convert <code>NSData</code> back to the object. </p> <p>It is a little cumbersome, because i need to convert to/from <code>NSData</code> everytime, but it just works.</p> <p>Here is one example per request:</p> <p>Save:</p> <pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSMutableArray *arr = ... ; // set value NSData *data = [NSKeyedArchiver archivedDataWithRootObject:arr]; [defaults setObject:data forKey:@"theKey"]; [defaults synchronize]; </code></pre> <p>Load:</p> <pre><code>NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults]; NSData *data = [defaults objectForKey:@"theKey"]; NSArray *arr = [NSKeyedUnarchiver unarchiveObjectWithData:data]; </code></pre> <p>The element in the array implements </p> <pre><code>@interface CommentItem : NSObject<NSCoding> { NSString *value; } </code></pre> <p>Then in the implementation of <code>CommentItem</code>, provides two methods:</p> <pre><code>-(void)encodeWithCoder:(NSCoder *)encoder { [encoder encodeObject:value forKey:@"Value"]; } -(id)initWithCoder:(NSCoder *)decoder { self.value = [decoder decodeObjectForKey:@"Value"]; return self; } </code></pre> <p>Anyone has better solution?</p> <p>Thanks everyone. </p>

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