macOS how to validate a textfield?

[rethish]

in my application one of the textfield is assigned to accept only numbers.But can be it done . Please help to validate a textfield only with numbers
thank you

 

[kainjow]

You can use NSPredicate. https://forums.macrumors.com/threads/480096/

 

[rethish]

thank you

thank you

i tried that. it works for email validation . when trying to validate a number with some change ,it is not working. please show another way

 

[kainjow]

Yes you would need to modify the regular expressions. There are a ton of tutorials on this, just google it.