How write + NSDictionary in file

 NSMutableDictionary *dicta = [[NSMutabl开发者_如何学GoeDictionary alloc]  init];

 [dicta writeToFile:[docDirectory stringByAppendingPathComponent:foo] atomically:YES];

I know only how write

W+ ?

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If you're talking about appending to a file. Usually, you would modify the NSMutableDictionary using code and then save the entire Dictionary to disk using the code you posted above.