Ios 更改首先打开的视图（Xcode）

可能重复：

---

因此，如果我制作了一个应用程序，并且某个视图在默认情况下首先打开，并且决定要更改首先打开的视图，我将如何执行此操作？

该操作由AppDelegate.m文件（或应用程序委派文件的标题）中名为didFinishLaunchingWithOptions的方法控制。例如，在我创建的选项卡栏应用程序中，它如下所示：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    // Add the tab bar controller's current view as a subview of the window

    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    // Add the tab bar controller's current view as a subview of the window
    MapViewController *mvc = [[MapViewController alloc]initWithNibName:@"MapViewController" bundle:nil]; //Allocate the View Controller

    self.window.rootViewController = mvc;   //Set the view controller
    [self.window makeKeyAndVisible];  
    [mvc release];    //Release the memory
    return YES;
}

您所要做的就是更改self.window.rootViewController的值。例如，假设您希望MapViewController成为要打开的第一个页面。你可以这样做：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    // Add the tab bar controller's current view as a subview of the window

    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible];
    return YES;
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    // Add the tab bar controller's current view as a subview of the window
    MapViewController *mvc = [[MapViewController alloc]initWithNibName:@"MapViewController" bundle:nil]; //Allocate the View Controller

    self.window.rootViewController = mvc;   //Set the view controller
    [self.window makeKeyAndVisible];  
    [mvc release];    //Release the memory
    return YES;
}