Ios 如何从窗口加载和卸载UIViewController

我在加载应用程序时创建了一些逻辑，根据我在plist中设置的一些值，我可以从3个不同的视图加载这些逻辑

这就是我的代码的样子

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    //sets context for coredata
    CoreDataController *coreDataController = [CoreDataController sharedManager];
    coreDataController.managedObjectContext = self.managedObjectContext;

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.

    PrefsController *prefsController = [[PrefsController alloc] init];
    NSDictionary *prefsDictionary = [prefsController readPrefs];

    NSLog(@"%@", prefsDictionary);

    NSString *projectListBoolString = [prefsDictionary objectForKey:@"ProjectListAvailable"];
    NSString *installsBoolString = [prefsDictionary objectForKey:@"InstallsAvailable"];
    NSString *finishinBoolString = [prefsDictionary objectForKey:@"FinishingAvailable"];


    if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"F"]) && ([finishinBoolString isEqualToString:@"F"])) {
        self.getProjectListViewController = [[GetProjectListViewController alloc] initWithNibName:@"GetProjectListViewController" bundle:nil];
        self.window.rootViewController = self.getProjectListViewController;
        [self.window makeKeyAndVisible];
    }
    else if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"T"]) && ([finishinBoolString isEqualToString:@"T"])) {
        self.currentProjectListViewController = [[CurrentProjectListViewController alloc] initWithNibName:@"CurrentProjectListViewController" bundle:nil];
        self.window.rootViewController = self.currentProjectListViewController;
        [self.window makeKeyAndVisible];
    }
    else {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
        self.window.rootViewController = self.viewController;
        [self.window makeKeyAndVisible];
    }

    return YES;
}

我希望能够加载和卸载UIViewController（包括使用按钮等从内存中删除）

我不想使用基于navigaiton的控制器，因为我希望视图是静态的或单独的，如果这样更有意义的话

如果有人能给我看一些示例代码，将新的UIViewController加载到窗口并删除旧的UIViewController，我会非常感激

然而，我不确定处理这个问题的正确方法，甚至不确定代码的外观

---

任何帮助都将不胜感激。

对我来说，这样加载您的视图不是一个好方法。 最好在AppDelegate中加载一个rootViewController，并根据

rootViewController

中的plist添加当前视图：

AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    RootViewController *rootViewController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:nil];
    self.window.rootViewController = rootViewController;
    [self.window makeKeyAndVisible];
    return YES;
}

在

RootViewController

中，根据plist添加当前视图的子视图后：

RootViewController.m

#pragma mark - View management
- (void)viewDidLoad
{
    [super viewDidLoad];

    NSDictionary *prefsDictionary = [prefsController readPrefs];

    NSLog(@"%@", prefsDictionary);

    NSString *projectListBoolString = [prefsDictionary objectForKey:@"ProjectListAvailable"];
    NSString *installsBoolString = [prefsDictionary objectForKey:@"InstallsAvailable"];
    NSString *finishinBoolString = [prefsDictionary objectForKey:@"FinishingAvailable"];

    if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"F"]) && ([finishinBoolString isEqualToString:@"F"])) {
        self.getProjectListViewController = [[GetProjectListViewController alloc] initWithNibName:@"GetProjectListViewController" bundle:nil];
        // Add View Controller
        [self.view addSubview:self.getProjectListViewController.view
    }
    else if (([projectListBoolString isEqualToString:@"T"]) && ([installsBoolString isEqualToString:@"T"]) && ([finishinBoolString isEqualToString:@"T"])) {
        self.currentProjectListViewController = [[CurrentProjectListViewController alloc] initWithNibName:@"CurrentProjectListViewController" bundle:nil];
        // Add View Controller
        [self.view addSubview:self.currentProjectListViewController.view];
    }
    else {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
        // Add View Controller
        [self.view addSubview:self.viewController.view];
    }
}

---

您确实应该考虑使用导航控制器来处理应用程序中的导航。这些将确保您的VIEW控制器的LoopVIEW EN卸载视图将被自动调用。我无法想象这是正确的另一种方式。按钮可以用来将这些视图控制器推到导航控制器上。创建到视图的导航。我同意@TotumusMaximus。我认为最好的方法是在主窗口中安装一个rootViewController，并使用导航控制器推送其他视图。看看这里，我倾向于同意你们的观点，但这不是一个以导航为中心的应用程序。有3个视图在任何一个time。因此，应用程序代理能够加载3个ViewController中的任何一个作为第一个/rootvew。我将很快为不带导航控制器的用户添加答案；）