替换搜索的背景图,
for (UIView *subview in self.searchBar.subviews)
{if ([subview isKindOfClass:NSClassFromString(@"UISearchBarBackground")])
{
((UIImageView*)subview).image=[UIImage imageNamed:@"searchBg.png"];//替换了搜索框的背景图片
}
if ([subview isKindOfClass:[UITextField class]])
{
UITextField *textField = (UITextField *)subview;textField.borderStyle = UITextBorderStyleRoundedRect;//将搜索框的边框变成了矩形
break;
}