iphone - How do you custom format the textfield? -

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I know NSNumberFormatter allows you some flexibility in customizing the text field, but if you need a more specific format , How do you do it

For example:

Timecode "03: 50: 02: 25"?

or

the end of the string "6,264 ft"?

Thank you.

But it is more useful to filter the input. Formatting of the input after the text is entered .


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