How to set maximum string length in NSTextField in swift? - swift3

Question

I like to set the max length of text displayed in a NSTextField so that the long text should be truncated and ended with two dots (..).
The problem is that different languages have different lengths even they have same number of characters.
E.g. let myTitle1 = "Lake" // 4 English characters
let myTitle2 = "我的标题" // 4 Chinese characters
let myTitle3 = "A beautiful Lake" // 16 English characters
I like above three titles display with similar (if not exactly same) length in NSTestField like this:
"Lake"
"我的.."
"A be.."
Are there any ways to do it?
thanks

Answer 1

This is a little late but for anyone else looking for an answere. You should not manually truncate text, let the OS do it for you.
Align the textfield in your storyboard as you want it and set the line break to truncate tail.
Also set the textfields compression resistance to a low value else the textfield borders will get pushed instead of the text being trucated.

Answer 2

//MARK:-  Login 
#IBAction func performLogin(_ sender: Any){
//Username & Password - CHARACTER LIMIT CHECK
guard isLoginFormCharLimitValid else {
return
}
//Need to call API
print("Redy To Call API")
}
//MARK:-  Username & Password - CHARACTER LIMIT CHECK 
private var isLoginFormCharLimitValid: Bool {
var isLoginFormCharLimitValid: Bool = true
//Username Field Characters Length
let userNameLength = (usernameTextField.stringValue as NSString).length
if userNameLength > AppConstant.IntValues.twofiftyfive.rawValue {
//Need to show Error Message Here
errorLabel.stringValue = LoginValidationMessages.userNameFieldCharacterLimit.localized
isLoginFormCharLimitValid = false
return isLoginFormCharLimitValid
}
//Password Field Characters Length
let passwordLength = (passwordTextField.stringValue as NSString).length
if passwordLength > AppConstant.IntValues.twofiftyfive.rawValue {
//Need to show Error Message Here
errorLabel.stringValue = LoginValidationMessages.passwordFieldCharacterLimit.localized
isLoginFormCharLimitValid = false
return isLoginFormCharLimitValid
}
errorLabel.stringValue = EMPTY_STRING
return isLoginFormCharLimitValid
}

Answer 3

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
guard let text = textField.text else { return true }
let newLength = text.characters.count + string.characters.count - range.length
if(textField == myTitle1){
return newLength <= 4
}else if(textField == myTitle2){
return newLength <= 4
}else{
return newLength <= 16
}
return true // Bool
}