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1. 首先新建一个ViewController，通过file->new file，选择Cocoa Touch Class，名字例如为TmpViewController， 基类为UIViewController，注意勾选xib，启动时要用到：
   
   
   在主ViewController中添加一个按钮，通过按钮启动TmpViewController：

- (IBAction)jump:(id)sender {       NSLog(@"jump to new view");    TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil];    [self.navigationController pushViewController:tvc animated:YES];    //[self presentViewController:tvc animated:YES completion:nil];}

我们可以发现，可以通过presentViewController 启动新的界面，但是却无法通过navigationController 来启动新页面，这是因为默认情况下，navigationController是nil的，需要设置应用的navigationController，同时设置首页（主view）：

#import 
   
    #import "ViewController.h"@interface AppDelegate : UIResponder 
    
     @property (strong, nonatomic) UIWindow *window;@property (strong, nonatomic) ViewController *viewController;@property (strong, nonatomic) UINavigationController *navController;@end
    
   

AppDelegate.m的didFinishLaunchingWithOptions中添加：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {       // Override point for customization after application launch.    self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];    //self.viewController = [[ViewController alloc]init];    UIStoryboard *mainStory = [UIStoryboard storyboardWithName:@"Main" bundle:nil];    self.viewController = [mainStory instantiateViewControllerWithIdentifier:@"ViewController"];    UINavigationController *navi = [[UINavigationController alloc]initWithRootViewController:self.viewController];    self.window.rootViewController = navi;    [self.window makeKeyAndVisible];    return YES;}

这里需要注意的是，xcode9默认的viewcontroller是没有xib的，想要的UI是Main.storyboard，所以要通过UIStoryboard来初始化viewController，注意大小写，同时在Main.storyboard中注意添加Identifier名称：

- (IBAction)jump:(id)sender {       NSLog(@"jump to new view");    TmpViewController *tvc = [[TmpViewController alloc]initWithNibName:@"TmpViewController" bundle:nil];    [self.navigationController pushViewController:tvc animated:YES];    //[self presentViewController:tvc animated:YES completion:nil];}

这里initWithNibName，这里对应的是xib，如果没有xib，会直接异常，这也是为什么AppDelegate不用initWithNibName来初始化主view的原因。

参考：

https://blog.csdn.net/u012605629/article/details/52122586