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dbettermann/gist:88d0e7e5264bb0640056

Created March 6, 2015 23:45
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Only allow numbers and backspaces in UITextField
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gistfile1.swift
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
return string.toInt() != nil || string.isEmpty
}
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