iphone - Can I limit the character set for a UITextField? -

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I have a bitmap font that does not contain any letters, such as pronunciation characters (é î ü etc) or symbols such as " ¥ "or © which I'm using to display the user name in a game for highscore table.

Is it possible to limit the UI keyboard to certain characters, or only certain characters are allowed in the UTIPField? Or do I have to roll my input mechanism? I'm thinking and old school, arcade style, once a "thing" a letter will be fine.

You can try to use the following UITextFieldDelegate method: 

 < Code> - (BOOL) textField: (UITextField *) textField shouldChangeCharactersInRange: (NSRange) Category Replacement String: (NSString *) string;

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