ios - UISearchBar输入框背景色

1.    //输入框背景色

       bar.searchBarStyle = UISearchBarStyleMinimal;

       [bar positionAdjustmentForSearchBarIcon:UISearchBarIconSearch];

       

       // 改变UISearchBar内部输入框样式

       UIView *searchTextField = nil;

       searchTextField = [[[bar.subviews firstObject] subviews] lastObject];

       // 改变输入框背景色

       searchTextField.subviews[0].backgroundColor = [UIColor purpleColor];

   //    searchTextField.layer.cornerRadius = 5.0;