ios系统升级到7.1后，原来在7.0下显示正常的UISearchbar现在又出现问题了。究其原因，是由于UISearchbar的subview又做修改了。
float version = [[[UIDevice currentDevice] systemVersion] floatValue];
if ([mySearchBar respondsToSelector:@selector(barTintColor)]) {
float iosversion7_1 = 7.1;
if (version >= iosversion7_1)
{
//iOS7.1
[[[[mySearchBar.subviews objectAtIndex:0] subviews] objectAtIndex:0] removeFromSuperview];
[mySearchBar setBackgroundColor:[UIColor clearColor]];
}
else
{
//iOS7.0
[mySearchBar setBarTintColor:[UIColor clearColor]];
[mySearchBar setBackgroundColor:[UIColor clearColor]];
}
}
else
{
//iOS7.0以下
[[mySearchBar.subviews objectAtIndex:0] removeFromSuperview];
[mySearchBar setBackgroundColor:[UIColor clearColor]];
}