【iOS基础控件 - 14】 控制器 && 控制器的view

1 ViewController *vc = [[ViewController alloc] init];

1 ViewController *vc = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
2     // 手动添加window到screen
3     self.window = [[UIWindow alloc] init];
4     self.window.frame = [[UIScreen mainScreen] bounds];
5     self.window.backgroundColor = [UIColor grayColor];
6     [self.window makeKeyAndVisible];
7     return YES;
8 }

1     // 2.取得stroyboard
2     UIStoryboard *sb = [UIStoryboard storyboardWithName:@"mysb" bundle:nil];

1     // 3.1直接使用InitialViewController
2     self.window.rootViewController = [sb instantiateInitialViewController];

1     // 4.使用ID取得controller, 设置rootViewController
2     self.window.rootViewController = [sb instantiateViewControllerWithIdentifier:@"vc2"];

 1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 2     // 1.手动添加window到screen
 3     self.window = [[UIWindow alloc] init];
 4     self.window.frame = [[UIScreen mainScreen] bounds];
 5     self.window.backgroundColor = [UIColor grayColor];
 6     [self.window makeKeyAndVisible];
 7    
 8     // 2.取得stroyboard
 9     UIStoryboard *sb = [UIStoryboard storyboardWithName:@"mysb" bundle:nil];
10    
11     // 3.取出storyboar中的controller
12     // 3.1直接使用InitialViewController
13     ViewController *controller = [sb instantiateInitialViewController];
14    
15     // 3.2使用ID
16     ViewController2 *controller2 = [sb instantiateViewControllerWithIdentifier:@"vc2"];
17    
18     // 4.设置rootViewController
19     self.window.rootViewController = controller2;
20    
21     return YES;
22 }

 1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 2     // 1.手动添加window到screen
 3     self.window = [[UIWindow alloc] init];
 4     self.window.frame = [[UIScreen mainScreen] bounds];
 5     self.window.backgroundColor = [UIColor grayColor];
 6     [self.window makeKeyAndVisible];
 7  
 8     // 从xib加载控制器, 设置rootViewController
 9     self.window.rootViewController = [[XibViewController alloc] initWithNibName:@"myx" bundle:nil];
10     
11     return YES;
12 }

 1 // 加载view，这是延迟加载，当需要使用view而view是空的时候调用
 2 - (void)loadView {
 3     NSLog(@"loadView...");
 4     self.view = [[UIView alloc] init];
 5     self.view.frame = [[UIScreen mainScreen] bounds];
 6     UILabel *label = [[UILabel alloc] init];
 7     label.frame = CGRectMake(40, 40, 100, 100);
 8     label.text = @"loadView";
 9     [self.view addSubview:label];
10 }

 1 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
 2     // 配置window
 3     self.window = [[UIWindow alloc] init];
 4     self.window.frame = [[UIScreen mainScreen] bounds];
 5     self.window.backgroundColor = [UIColor grayColor];
 6    
 7     // 配置storyboard中的controller为rootViewController
 8     self.window.rootViewController = [[UIStoryboard storyboardWithName:@"test" bundle:nil] instantiateInitialViewController];
 9   
10      // 配置xib中的controller为rootViewController，主要要使用带有loadView的controller
11 //    self.window.rootViewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
12    
13     // 显示window
14     [self.window makeKeyAndVisible];
15     return YES;
16 }
17  

1      // 配置xib中的controller为rootViewController，主要要使用带有loadView的controller
2     self.window.rootViewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];