(GeekBand) iOS编程第二周

控制器view的加载

控制器view加载.png

生命周期

生命周期方法.png

程序启动完成时

// 程序启动完成的时候
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    // 1.创建窗口,注意窗口必须要有尺寸，尺寸跟屏幕一样大的尺寸,窗口不要被释放
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor redColor];
    
    // 2.创建窗口的跟控制器
    UIViewController *vc = [[UIViewController alloc] init];
    vc.view.backgroundColor = [UIColor yellowColor];
    
    [vc.view addSubview:[UIButton buttonWithType:UIButtonTypeContactAdd]];
    
    // 如果设置窗口的跟控制器，默认就会把控制器的view添加到窗口上
    // 设置窗口的跟控制器，默认就有旋转功能
    self.window.rootViewController = vc;
    
//    [self.window addSubview:vc.view];
    
    // 3.显示窗口
    [self.window makeKeyAndVisible];
    
    return YES;
}

代码加载storyboard

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    // 创建窗口
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    
    // 创建窗口的跟控制器
    // 加载storyboard
    // storyboard文件名，不需要带后缀
    // nil:  [NSBundle mainBundle]
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    // 通过storyboard创建控制器
    // instantiateInitialViewController：加载箭头指向的控制器
//    UIViewController *vc = [storyboard instantiateInitialViewController];  
    UIViewController *vc = [storyboard instantiateViewControllerWithIdentifier:@"green"];  
    NSLog(@"%@",[vc class]);
    self.window.rootViewController = vc;  
    // 显示窗口
    [self.window makeKeyAndVisible];
    return YES;
}

代码加载xib

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
  // 创建窗口
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    // 通过xib创建控制器
    ViewController *vc = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    self.window.rootViewController = vc;
    [self.window makeKeyAndVisible];
   return YES;
}

view的懒加载

创建UIViewController控制器，控制器的view并没有创建
控制器的view懒加载：第一次使用的时候才会去加载，并不是创建UIViewController控制器的时候去加载

navigation

// 控制器的view加载完成的时候调用
// 通常这个方法只会调用一次
- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
// 设置导航条的内容:navigationItem
  // 中间的文字标题
//    self.navigationController.navigationItem.title = @"第一个控制器";
//    self.navigationItem.title = @"第一个控制器";
    self.title =  @"第一个控制器";
  // 中间的view
//    self.navigationItem.titleView = [UIButton buttonWithType:UIButtonTypeContactAdd];
  // 左边按钮
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"左边" style:UIBarButtonItemStyleDone target:self action:@selector(btnClick)]; 
    // 导航条右边按钮
     // 在iOS7之后默认会把导航条上面的按钮渲染成蓝色
    UIImage *image = [UIImage imageNamed:@"navigationbar_friendsearch"]; 
    // 通过代码告诉苹果不要渲染图片
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
//    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:nil action:nil]; 
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setImage:[UIImage imageNamed:@"navigationbar_friendsearch"] forState:UIControlStateNormal];
    [btn setImage:[UIImage imageNamed:@"navigationbar_friendsearch_highlighted"] forState:UIControlStateHighlighted];
    // 导航条上面的内容位置不能由开发者决定，开发者只能控制尺寸
//    btn.frame = CGRectMake(2000, 3000, 30, 30);
    // 控件的尺寸由图片决定
    // 仅仅是设置尺寸
    [btn sizeToFit];
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:btn];    
}
/*
 只要以后看到Item，一般都是苹果提供的模型。
 UINavigationItem：控制导航条的内容
 UIBarButtonItem：控制导航条上面按钮的内容
 */

tarbar

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    // 创建窗口
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    
    // 设置窗口的跟控制器
    UITabBarController *tabBarVc = [[UITabBarController alloc] init];
    
    self.window.rootViewController = tabBarVc;
    
    UIViewController *vc = [[UIViewController alloc] init];
    
    vc.view.backgroundColor = [UIColor redColor];
    
    // 添加子控制器
    [tabBarVc addChildViewController:vc];
    
    //  设置按钮上面的内容
    vc.tabBarItem.title = @"消息";
    vc.tabBarItem.image = [UIImage imageNamed:@"tab_recent_nor"];
    vc.tabBarItem.badgeValue = @"1000";
    
    UIViewController *vc1 = [[UIViewController alloc] init];
    
    vc1.view.backgroundColor = [UIColor greenColor];
    
    // 添加子控制器
    [tabBarVc addChildViewController:vc1];

    vc1.tabBarItem.title = @"联系人";
    vc1.tabBarItem.badgeValue = @"10";
    // 显示窗口
    [self.window makeKeyAndVisible];
    
    
    return YES;
}

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