纯代码创建UINavigationController

#import "ViewController.h"


@interface AppDelegate ()


@end


@implementation AppDelegate




- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:[[ViewController alloc] init]];
    self.window.rootViewController = navigationController;
    return YES;
}