控制器的创建方式 -- 及其导航控制器的管理

• 一 控制器的创建方式

1、storyboard创建

self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    self.window.backgroundColor = [UIColor blueColor];
   
    UIStoryboard *story = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    
//    SDoneViewController *vc = [story instantiateInitialViewController];
    
    SDoneViewController *VC1 = [story instantiateViewControllerWithIdentifier:@"two"];
    
    self.window.rootViewController = VC1;
    
    
    [self.window makeKeyAndVisible];
    
    return YES;

2、直接创建控制器

    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    self.window.backgroundColor = [UIColor blueColor];

    SDoneViewController *vc = [[SDoneViewController alloc] init];
    
    self.window.rootViewController = vc;
    
    
    [self.window makeKeyAndVisible];
    
    return YES;

3、通过XIB创建控制器

elf.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    self.window.backgroundColor = [UIColor blueColor];
   
    SDThreeViewController *three = [[SDThreeViewController alloc] initWithNibName:@"three" bundle:nil];
    
    self.window.rootViewController = three;
    
    
    [self.window makeKeyAndVisible];
    
    return YES;