swift修改UITextfield的Placeholder字体大小和颜色

//第一种   

   let textField = UITextField.init()
  //字体大小
  textField.setValue(UIFont.systemFont(ofSize: 15), forKeyPath: "_placeholderLabel.font")
  //字体颜色
  textField.setValue(UIColor.red, forKeyPath: "_placeholderLabel.textColor")

//第二种

//字体大小
  textField.attributedPlaceholder = NSAttributedString.init(string:"输入你需要的服务", attributes: [NSFontAttributeName:UIFont.systemFont(ofSize:15)])
  //字体颜色
  textField.attributedPlaceholder = NSAttributedString.init(string:"输入你需要的服务", attributes: [
  NSForegroundColorAttributeName:UIColor.red])