iOS swift UISearchBar拿到textfield控件

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目标：修改 UISearchBar textField 光标颜色 和 取消按钮颜色不一致。

searchBar.barTintColor = UIColor.clear
if let textfiled = searchBar.subviews.first?.subviews.last as? UITextField {
       textfiled.tintColor = UIColor.yellow
 }