How to change placeholder color in UITextField on tvOS, so that the change is kept and it does not revert back to its default placeholder state?

问题

How to change placeholder color in UITextField on tvOS, so that the change is kept and it does not revert back to its default placeholder state?

In viewDidLoad() I have added the following:

self.txfUsername?.attributedPlaceholder = NSAttributedString(string: "Email", attributes:[NSForegroundColorAttributeName: UIColor(red:1.0, green:1.0, blue:1.0, alpha:1.0), NSFontAttributeName:UIFont(name:"GothamBook", size:38.0)!])

So at first the placeholder color is white, however when it looses focus it reverts back to its default state.

How to keep the change of the placeholder color?

回答1:

Basically, need to update again the properties in didUpdateFocus in the main thread

 override func didUpdateFocus(in context: UIFocusUpdateContext,
                        with coordinator: UIFocusAnimationCoordinator) {

    DispatchQueue.main.async {
        self.emailTextField.attributedPlaceholder = NSAttributedString(string: emailTitle,

                                                                       attributes:  [NSForegroundColorAttributeName:UIColor.white])
        self.passwordTextField.attributedPlaceholder = NSAttributedString(string: passwordTitle,

                                                                          attributes:  [NSForegroundColorAttributeName:UIColor.white])
    }
}

来源：https://stackoverflow.com/questions/37788135/how-to-change-placeholder-color-in-uitextfield-on-tvos-so-that-the-change-is-ke