更改首先打开的视图（Xcode）[重复]

Question

可能重复：
How to change the default View Controller that is loaded when app launches?

因此，如果我创建了一个应用，并且默认情况下首先打开某个视图，并决定要更改首先打开哪个视图，我该怎么做？

Answer 1

这在您的 AppDelegate.m 文件（或任何应用程序委托文件的标题）中名为 didFinishLaunchingWithOptions 的方法中进行控制。例如，在我创建的标签栏应用程序中，它看起来像这样：

- (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;
}

你所要做的就是改变 self.window.rootViewController 的值。例如，假设您希望 MapViewController 成为第一个打开的页面。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
    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;
}