Subclassing UIDocument

In the sample app, each note that a user creates is an instance of a custom UIDocument subclass called ICFMyNoteDocument. Subclasses of UIDocument should implement the contentsForType:error: method and the loadFromContents:ofType:error: method, and then implement change tracking to enable UIDocument’s autosaving feature. Because the notes in the sample app are only storing the note text in a string, these methods are simple to implement.

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- (id)contentsForType:(NSString *)typeName               error:(NSError *__autoreleasing *)outError{    if (!self.myNoteText)    {        [selfsetMyNoteText:@""];    }    NSData *myNoteData =    [self.myNoteText dataUsingEncoding:NSUTF8StringEncoding];     ...

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