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HOWTO: Swift Nstextfield allow only specified characters (ex: alpha-numeric)

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I need somebody to show me how to allow specific characters in a nstexfield in swift. For example when a user tries to enter a character which is not in the list the nstexfield will not show that character in the field.. Very simple. There are many IOS examples out there but could not find an OSX example.

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@ANTdevelopment

Hey there, I can guide you through this closely, and at the same time make sure you understand how to do it in the future. I can also explain different techniques you could use to allow specific characters within NSTextField. We can do this in Swift, Objective-C, or both if you would like. Thanks!

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