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;