更改首先打开的视图（Xcode）
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Change which view opens first (Xcode)
提问by iOS developer
Possible Duplicate:
How to change the default View Controller that is loaded when app launches?
可能的重复：
如何更改应用启动时加载的默认视图控制器？
So if I made an app and a certain view opens first by default, and decide I want to change which view opens first, how would I do that?
因此，如果我制作了一个应用程序并且默认情况下某个视图首先打开，并决定要更改首先打开哪个视图，我该怎么做？
回答by MillerMedia
That is controlled in the method in your AppDelegate.m file (or whatever the title of your app delegate file is) called didFinishLaunchingWithOptions. For example, in a tab bar app I've created it looks like this:
这是在您的 AppDelegate.m 文件（或您的应用程序委托文件的任何标题）中称为 didFinishLaunchingWithOptions 的方法中控制的。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;
}
All you have to do is change the value of the self.window.rootViewController. For example, let's say you want a MapViewController to become the first page to open. You could do something like this:
您所要做的就是更改 self.window.rootViewController 的值。例如，假设您希望 MapViewController 成为打开的第一个页面。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
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;
}
