ios创建控制器的3种方法实现页面跳转

ios遵守mvc设计模式，下面介绍创建控制器viewcontroller的几种方法，来实现页面的跳转

1.纯代码创建

//
//  AppDelegate.m
//  study2024
//
//  Created by zhifei  zhu on 2024/8/7.
//#import "AppDelegate.h"
#import "MyViewController.h"
@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {// Override point for customization after application launch.//使用自定义viewcontroller,先删除main.storyboard和viewcontroller//1.创建窗口并指定大小self.window=[[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];//2.创建控制器MyViewController *myViewController=[[MyViewController alloc]init];myViewController.view.backgroundColor=[UIColor greenColor];//3.设置为窗口的根控制器self.window.rootViewController=myViewController;//4.将窗口作为应用程序的主窗口[self.window makeKeyWindow];return YES;
}#pragma mark - UISceneSession lifecycle- (UISceneConfiguration *)application:(UIApplication *)application configurationForConnectingSceneSession:(UISceneSession *)connectingSceneSession options:(UISceneConnectionOptions *)options {// Called when a new scene session is being created.// Use this method to select a configuration to create the new scene with.return [[UISceneConfiguration alloc] initWithName:@"Default Configuration" sessionRole:connectingSceneSession.role];
}- (void)application:(UIApplication *)application didDiscardSceneSessions:(NSSet<UISceneSession *> *)sceneSessions {// Called when the user discards a scene session.// If any sessions were discarded while the application was not running, this will be called shortly after application:didFinishLaunchingWithOptions.// Use this method to release any resources that were specific to the discarded scenes, as they will not return.
}@end

2. 通过storyboard创建控制器

1）、Is initial view controller打上勾

   //通过storyboard创建控制器

    UIStoryboard *uiStoryboard=[UIStoryboard storyboardWithName:@"MyStoryboard" bundle:nil];

    //storyboard只有一个viewcontroller的情况

//    MyViewController *myVc=[uiStoryboard instantiateInitialViewController];

    

    //storyboard有多个viewcontroller的情况，需要使用storyboard id属性

    MyCatViewController *myVc=[uiStoryboard instantiateViewControllerWithIdentifier:@"MyStoryboard1"];

     

    

    [self.view.window setRootViewController:myVc];

2.3、通过xib创建控制器

 //创建控制器的时候同时创建xib页面

    PhotoViewController * myVc = [[PhotoViewController alloc]init];

    [self.view.window setRootViewController:myVc];