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NSTextField sets the maximum characters

Is there an easy way to set the character limit my NSTextField can have? I do not want the counter to then warn the user if he has exceeded the limit, I want to set a limit, so if he skips the x-characters, they can no longer print.

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Check out NSFormatter. It can help you do what you are looking for and more. If you don’t need something complicated, you can try the NSTextField delegation methods.

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Source: https://habr.com/ru/post/1719134/

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