UISearchBar与背景颜色不一致

用这个代码：

 UITextField *searchField = [self.searchBar valueForKey:@"_searchField"];
   [searchField setBackground:[UIImage imageNamed:@"searchfield_bg"]];

   [self.searchBar setTintColor:[UIColor blackColor]];
   UIImage *searchimg = [UIImage imageNamed:@"search_panel.png"];

   for (UIView *subview in self.searchBar.subviews) {
       if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")]) {
           UIView *bg = [[UIView alloc] initWithFrame:subview.frame];
           bg.backgroundColor = [UIColor colorWithPatternImage:searchimg];
           [self.searchBar insertSubview:bg aboveSubview:subview];
           [subview removeFromSuperview];
           [bg release];
           break;
       }
   }

我是用这个代码实现了这样的效果：你只要改一下颜色就行了。


最终效果是这样的