本地化应用程序时，UITextField 占位符颜色不同

Question

I have a really weird problem. I have a UITextField class with IBInspectable var to change it's placeholder color and I'm doing it like this:

attributedPlaceholder = NSAttributedString(string: placeholder != nil ?  placeholder! : "", attributes:[NSForegroundColorAttributeName : color])

When the app scheme is set to System language , English or any language which is LTR , it works fine.

But when it's set to Hebrew or any other language which is RTL , it doesn't show at all. However, in the Debug Hierarchy View it shows that the placeholder is there.

Note that I am setting the translations using the Localizable.strings in the code instead of the localized storyboards. Everything works except for UITextfield s placeholders

Thanks:)

EDIT: Apparently, all that happens is that attributedPlaceholder is not taking any effect whatsoever when the app is in LTR mode. I changed one of the UITextfields background to white, and it shows. Only the attributedPlaceholder & NSAttributedString s color doesn't work on RTL mode

Still need a solution though:(

Answer 1

Try this:

extension UITextField{

    override func setLocalized() -> Void {
        if UtilityClass.isLanguageRTL()// check RTL or LTR here {
            self.textAlignment = .right
            self.semanticContentAttribute = .forceRightToLeft
        }
        else{
            self.textAlignment = .left
            self.semanticContentAttribute = .forceLeftToRight
        }
    }

}

In ViewWillAppear

    textField1?.setLocalized()
    textField2?.setLocalized()

Answer 2

I also occurred the same situation that placeholder fonts were changed after localization (Not only LTR setting).

We had a customized object inherit from UITextField and change the color when initialize.

@IBInspectable
var placeholderColor: UIColor = UIColor.white {
    didSet {
        attributedPlaceholder = NSAttributedString(string: placeholder ?? "", attributes: [NSAttributedString.Key.foregroundColor: placeholderColor])
    }
}

override init(frame: CGRect) {
    super.init(frame: frame)
    ....
    attributedPlaceholder = NSAttributedString(string: placeholder ?? "", attributes: [NSAttributedString.Key.foregroundColor: placeholderColor])
    ....
}

As using the Localizable.strings , we translated the string in ViewController as below.

    emailTextField.placeholder = "Generic.Textfield.Email".localized

However, when changing the string of placeholder didn't trigger to change placeholder color. Thus, it turns to the default value (R0 G0 B 0.1 A0.22).

We override placeholder manually and modify the attributedPlaceholder as the way as we did in the initialization. And FIX: Hope it can help others as well :)

PS: Seems Apple fix after iOS 13 but it works for the version before iOS 12.