UISearchbar设置占位文字颜色及相关API

/// 设置 _placeholderLabel 字体颜色
let searchField : UITextField = self.searBar.value(forKey: "_searchField") as! UITextField
let searchLabel : UILabel = (searchField.value(forKey: "_placeholderLabel") as? UILabel)!
searchLabel.textColor = UIColor.white

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