ios - UISearchBar输入框背景色

   //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;