14打飞机游戏_视图控制器_TODO

一、打飞机游戏
项目：Homework_Plane_Teacher0309
1.1 添加标签 #pragma mark 1.创建两张地图，实现地图的移动
1.2 代码的封装
1.2.1 //TODO:
1.2.2 #pragma mark

二、视图控制器
项目：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];
    //视图控制器的
    //作用：管理视图
    //视图控制器内部 有一个自带的view
    
    //1.创建视图控制器的一个子类
    
    //2.实例化一个视图控制器的对象
    //firstVC：是一个抽象的管理者，不可见。
    _firstVC = [[FirstViewController alloc]init];
    
    //把firstVC设置为window的根视图控制器，
    //就相当于将firstVC.view添加到window上
    //即：[self.window addSubview:firstVC.view];
    //视图控制器加载view的模式：懒加载模式（当你使用视图控制器的时候，才会加载view）
    self.window.rootViewController = _firstVC;
    
    return YES;
}

2.2 FirstViewController.m

//视图已经加载成功
//注意：这个方法在视图控制器的整个生命周期中只会调用一次
- (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:@"下一页" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
}
//下一页按钮
- (void)click:(UIButton *)button
{
    SecondViewController *secondVC = [[SecondViewController alloc]init];
    //找到window window是 APPDelegate类的属性
    //1.先找到“应用程序类”（单例类）的对象
    //即UIApplication的对象
    //单例类：在此应用程序中只有一个对象
    UIApplication *app = [UIApplication sharedApplication];
    //2.找入口类的对象
    //即AppDelegate的对象
    //就是UIApplication的对象的"代理协议"
    //即app.delegate
    AppDelegate *appDelegate = app.delegate;
    //3.获取window
    UIWindow *window = appDelegate.window;
    
    window.rootViewController = secondVC;
}

//只要view要显示出来
//就会调用两个方法：视图将要显示和视图已经显示
- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}
//视图已经显示
- (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];
    //添加返回按钮
    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.获得APPDelegate类对象
    AppDelegate *appDelegate = app.delegate;
    //3.获取window
    UIWindow *window = appDelegate.window;
    //获取FirstViewController
    window.rootViewController = firstVC;
}