在iOS中视图切换最简单一个估计就是模式视图了，下面简单演示一下模式视图：

1.新建一个空的工程，新建一个MainViewController类和一个SubViewController类

2.在AppDelegate.m中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    
    MainViewController *mvc = [[MainViewController alloc] init];
    self.window.rootViewController = mvc;
    
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    return YES;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor yellowColor];
    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(10, 10, 300, 40);
    [button setTitle:@"切换视图" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

- (void)btnClick
{
    SubViewController *svc = [[SubViewController alloc] init];
    svc.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;//动画效果
 [self presentViewController:svc animated:YES completion:^{}];//切换到下一个视图}



4.在SubViewController.m中


- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.view.backgroundColor = [UIColor redColor];
    
    UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame = CGRectMake(10, 10, 300, 40);
    [button setTitle:@"返回主视图" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

- (void)btnClick
{
    [self dismissViewControllerAnimated:YES completion:^{}];//返回上一个视图
}


iOS开发-模式视图