设置 TabBarItemt图片颜色

1 UIImage *discussSelectedImage = [UIImage imageNamed:@"discuss_selected"];
//设置图片不渲染
2     discussSelectedImage = [discussSelectedImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
3     discussController.tabBarItem =[[UITabBarItem alloc]initWithTitle:@"社区" image:[UIImage imageNamed:@"discuss_normal"] selectedImage:discussSelectedImage];