封装控制器、控件、

+(instancetype)navigationControllerWithController:(UIViewController *)vc Title:(NSString *)title ImageName:(NSString *)imageName SelectedImage:(NSString *)selectedImageName{

    NavigationController *nav = [[selfalloc]initWithRootViewController:vc]

{

 [nav.tabBarItem setTitle:title];

    UIImage*image = [UIImageimageNamed:imageName];

    [nav.tabBarItem setImage:image];

    UIImage*selectedImage = [UIImageimageNamed:selectedImageName];

    [nav.tabBarItem setSelectedImage:selectedImage];

    returnnav;

}