Swift 3.0
// create one textfield
@IBOutlet var txtDOB: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// set delegate for your textfield
txtDOB.delegate = self
}
// call your function in textfield delegate shouldChangeCharactersIn
func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
//Format Date of Birth dd-MM-yyyy
//initially identify your textfield
if textField == txtDOB {
// check the chars length dd -->2 at the same time calculate the dd-MM --> 5
if (txtDOB?.text?.characters.count == 2) || (txtDOB?.text?.characters.count == 5) {
//Handle backspace being pressed
if !(string == "") {
// append the text
txtDOB?.text = (txtDOB?.text)! + "-"
}
}
// check the condition not exceed 9 chars
return !(textField.text!.characters.count > 9 && (string.characters.count ) > range.length)
}
else {
return true
}
}
ObjectiveC
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
//Format Date of Birth dd-MM-yyyy
if(textField == txtDOB)
{
if ((txtDOB.text.length == 2)||(txtDOB.text.length == 5))
//Handle backspace being pressed
if (![string isEqualToString:@""])
txtDOB.text = [txtDOB.text stringByAppendingString:@"-"];
return !([textField.text length]>9 && [string length] > range.length);
}
else
return YES;
}
Swift 5
if textField == dateTextField {
if dateTextField.text?.count == 2 || dateTextField.text?.count == 5 {
//Handle backspace being pressed
if !(string == "") {
// append the text
dateTextField.text = dateTextField.text! + "."
}
}
// check the condition not exceed 9 chars
return !(textField.text!.count > 9 && (string.count ) > range.length)
} else {
return true
}
SwiftUI
struct DobScreen: View {
@State private var dobText: String = ""
@State var textLen = 0
var body: some View {
VStack(alignment: .leading) {
TextField("MM-DD-YYYY", text: $dobText)
.onChange(of: dobText) { newValue in
if newValue.count < textLen {
// If the length of the new value is less than the previous length,
// it indicates a deletion (backspace).
dobText = ""
textLen = 0
return
}
// Check if the input length exceeds 10 characters
guard newValue.count <= 10 else {
dobText = String(newValue.prefix(10))
return
}
// Handle backspace
if newValue.count < dobText.count {
// If the length of the new value is less than the previous length,
// it indicates a deletion (backspace).
dobText = ""
return
}
// Add separators for MM / DD / YYYY format
if newValue.count >= 2 && !newValue.contains("-") {
dobText.insert("-", at: dobText.index(dobText.startIndex, offsetBy: 2))
}
if newValue.count >= 5 && !newValue[dobText.index(dobText.startIndex, offsetBy: 5)...].contains("-") {
dobText.insert("-", at: dobText.index(dobText.startIndex, offsetBy: 5))
}
textLen = dobText.count
}
}.padding()
}
}