UISearchBar--改变内部输入框的背景颜色

 1 - (void)setSearchTextFieldBackgroundColor:(UIColor *)backgroundColor
 2 {
 3     UIView *searchTextField = nil;
 4     if (IsiOS7OrLater) {
 5         // 经测试, 需要设置barTintColor后, 才能拿到UISearchBarTextField对象
 6         self.barTintColor = [UIColor whiteColor];
 7         searchTextField = [[[self.subviews firstObject] subviews] lastObject];
 8     } else { // iOS6以下版本searchBar内部子视图的结构不一样
 9         for (UIView *subView in self.subviews) {
10             if ([subView isKindOfClass:NSClassFromString(@"UISearchBarTextField")]) {
11                 searchTextField = subView;
12             }
13         }
14     }
15 
16     searchTextField.backgroundColor = backgroundColor;
17 }