适配ios6 Assertion failure in -[UISearchDisplayController setActive:animated:]

or : navigation controller must not change between -setActive:YES and -setActive:NO

在使用UISearchDisplayController点击searchbar的取消以及遮盖灰色部分的时候有调用popViewControllerAnimated出现

只需要在界面在下面2个地方处理：

//修复点击遮盖灰色部分

-(void)searchDisplayControllerDidEndSearch:(UISearchDisplayController *)controller
{
    [self.navigationController popViewControllerAnimated:YES];
    [self.searchDisplayController setActive:NO animated:NO];

}

//修复点击取消

- (void)viewWillDisappear:(BOOL)animated {
    [self.searchDisplayController setActive:NO animated:YES];
    [super viewWillDisappear:animated];
}