一、打飛機(jī)游戲
項(xiàng)目：Homework_Plane_Teacher0309
1.1 添加標(biāo)簽 #pragma mark 1.創(chuàng)建兩張地圖，實(shí)現(xiàn)地圖的移動(dòng)
1.2 代碼的封裝
1.2.1 //TODO:
1.2.2 #pragma mark

二、視圖控制器
項(xiàng)目：ViewController0309
2.1 AppDelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    [self.window rootViewController];
    //視圖控制器的
    //作用：管理視圖
    //視圖控制器內(nèi)部 有一個(gè)自帶的view
    
    //1.創(chuàng)建視圖控制器的一個(gè)子類
    
    //2.實(shí)例化一個(gè)視圖控制器的對(duì)象
    //firstVC：是一個(gè)抽象的管理者，不可見。
    _firstVC = [[FirstViewController alloc]init];
    
    //把firstVC設(shè)置為window的根視圖控制器，
    //就相當(dāng)于將firstVC.view添加到window上
    //即：[self.window addSubview:firstVC.view];
    //視圖控制器加載view的模式：懶加載模式（當(dāng)你使用視圖控制器的時(shí)候，才會(huì)加載view）
    self.window.rootViewController = _firstVC;
    
    return YES;
}

2.2 FirstViewController.m

//視圖已經(jīng)加載成功
//注意：這個(gè)方法在視圖控制器的整個(gè)生命周期中只會(huì)調(diào)用一次
- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor yellowColor];
    
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 60, 40);
    btn.backgroundColor = [UIColor redColor];
    [btn setTitle:@"下一頁" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}
//下一頁按鈕
- (void)click:(UIButton *)button
{
    SecondViewController *secondVC = [[SecondViewController alloc]init];
    //找到window window是 APPDelegate類的屬性
    //1.先找到“應(yīng)用程序類”（單例類）的對(duì)象
    //即UIApplication的對(duì)象
    //單例類：在此應(yīng)用程序中只有一個(gè)對(duì)象
    UIApplication *app = [UIApplication sharedApplication];
    //2.找入口類的對(duì)象
    //即AppDelegate的對(duì)象
    //就是UIApplication的對(duì)象的"代理協(xié)議"
    //即app.delegate
    AppDelegate *appDelegate = app.delegate;
    //3.獲取window
    UIWindow *window = appDelegate.window;
    
    window.rootViewController = secondVC;
}

//只要view要顯示出來
//就會(huì)調(diào)用兩個(gè)方法：視圖將要顯示和視圖已經(jīng)顯示
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}
//視圖已經(jīng)顯示
- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

2.3 SecondViewController.m

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor greenColor];
    //添加返回按鈕
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 60, 40);
    btn.backgroundColor = [UIColor grayColor];
    [btn setTitle:@"返回" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(click) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}
- (void)click
{
    FirstViewController *firstVC = [[FirstViewController alloc]init];
    //1.找application
    UIApplication *app = [UIApplication sharedApplication];
    //2.獲得APPDelegate類對(duì)象
    AppDelegate *appDelegate = app.delegate;
    //3.獲取window
    UIWindow *window = appDelegate.window;
    //獲取FirstViewController
    window.rootViewController = firstVC;
}