APP首次启动引导界面和启动界面设置——iOS开发

2、非首次LaunchViewController，显示2s后进入主界面ViewController

3、主界面ViewController

4、不深究细节，一般启动引导都会有动画，图片之类的，非本次练习重点，所以没有设置，只有简单地标志作界面区分

（效果图在文末）

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor greenColor];

    UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    button.center = self.view.center;
    [button setTitle:@"Welcome" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

//点击button切换到下一个界面
- (void)btnAction:(UIButton *)btn {
    LaunchViewController *vc = [[LaunchViewController alloc] init];
    self.view.window.rootViewController = vc;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor blueColor];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 200, 50)];
    label.center = self.view.center;
    [label setFont:[UIFont systemFontOfSize:30]];
    label.text = @"启动页面";
    [self.view addSubview:label];

//    延迟2s调用，一般启动页面会停留，或者有些动画什么的，本例只简述思路，不深究细节
    [self performSelector:@selector(changeView) withObject:self afterDelay:2];
    // Do any additional setup after loading the view.
}

//切换到下一个界面
- (void)changeView {
    UIWindow *window = self.view.window;
    ViewController *main = [[ViewController alloc] init];

    //添加一个缩放效果
    main.view.transform = CGAffineTransformMakeScale(0.2, 0.2);
    [UIView animateWithDuration:0.1 animations:^{
        main.view.transform = CGAffineTransformIdentity;
    }];

    window.rootViewController = main;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor grayColor];
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)];
    label.center = self.view.center;
    [label setFont:[UIFont systemFontOfSize:30]];
    label.text = @"主界面";
    [self.view addSubview:label];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];

////    利用文件操作判断是否为第一次使用此APP
//    NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/firstUse.plist"];    //第一次启动，没有此文件，会自动创建
//    NSDictionary *dic = [NSDictionary dictionaryWithContentsOfFile:filePath];
//
//    BOOL notFirstUse = YES;
//    notFirstUse = [dic[@"notFirstUse"] boolValue];
//    if (!notFirstUse) {
//        NSDictionary *dic = @{@"notFirstUse" : @YES };
//        [dic writeToFile:filePath atomically:YES];
//        FirstUseViewController *vc = [[FirstUseViewController alloc] init];
//        self.window.rootViewController = vc;
//    }else {
//        LaunchViewController *vc = [[LaunchViewController alloc] init];
//        self.window.rootViewController = vc;
//    }
//

//    利用NSUserDefaults实现
    if(![[NSUserDefaults standardUserDefaults] boolForKey:@"firstLaunch"]) {
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"firstLaunch"];
        NSLog(@"首次启动");
        FirstUseViewController *vc = [[FirstUseViewController alloc] init];
        self.window.rootViewController = vc;
    }else {
        NSLog(@"非首次启动");
        LaunchViewController *vc = [[LaunchViewController alloc] init];
        self.window.rootViewController = vc;
    }

    return YES;
}

首次启动页面：

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