UITabBarItem显示真实自定义图片

_tabBarController = [[UITabBarController alloc]init];    [_tabBarController setViewControllers:@[recNav,feedNav,postNav,loginNav]];    // 拿到 TabBar 在拿到想应的item    UITabBar *tabBar = _tabBarController.tabBar;    UITabBarItem *item0 = [tabBar.items objectAtIndex:0];    // 对item设置相应地图片    item0.selectedImage = [[UIImage imageNamed:@"recognize-1"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];;    item0.image = [[UIImage imageNamed:@"recognize"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];