[英]How to add Hyphens in UITextField iOS Swift?
// Restrict entry to format 123-456-7890
您可以尝试使用类似的代码。
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
// All digits entered
if range.location == 12 {
return false
}
// Reject appending non-digit characters
if range.length == 0 && !NSCharacterSet.decimalDigitCharacterSet().characterIsMember(string.characterAtIndex(0)) {
return false
}
// Auto-add hyphen before appending 4rd or 7th digit
if range.length == 0 && (range.location == 3 || range.location == 7) {
textField.text = "\(textField.text!)-\(string)"
return false
}
// Delete hyphen when deleting its trailing digit
if range.length == 1 && (range.location == 4 || range.location == 8) {
range.location--
range.length = 2
textField.text = textField.text!.stringByReplacingCharactersInRange(range, withString: "")
return false
}
return true
}
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