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MainWindow.xib absence in Xcode 4.2 beta 4 with iOS 5 SDK  

2011-11-29 18:00:07|  分类: iphone |  标签: |举报 |字号 订阅

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http://chrislee.kr/wp/2011/07/24/mainwindow-xib-absence-in-xcode-4-2-beta-4-with-ios-5-sdk/

I had upgraded Xcode to 4.2 beta 4 and realised that there is no more templates for iOS 4.
Obviously, it did not include iOS 4 SDK because it said “with iOS 5 SDK”, duh!
I could not go back to Xcode beta 3 since I upgraded my iPhone to beta 4 as well.

Anyway…

In the tutorial that I am learning at the moment, it requires “Window-based application”.
Xcode 4.2 beta 4 does not have “window-based application”; so, I created a project with “Empty application”.
Unfortunately, “Empty application” has no longer “MainWindow.xib”, which tutorial teacher said to modify something in it.
So, I googled to make “MainWindow.xib” visible and found this article.

“MainWindow.xib” posted by Jeroen Trappers

What he said is that “MainWindow.xib” is not included by default in templates. He suggested to create “MainWindow.xib” manually as below:
(FYI, this instruction is only for me. It is better to go to original article and follow.)

1. Create new project in Xcode 4.2 beta and choose “Empty Application” template
2. Add “New File” to the project by choosing “iOS -> User Interface -> Empty”
3. Choose “iPhone” and name “MainWindow” (.xib will be added automatically)

4. Open “MainWindow.xib” in project navigator
5. Click “File’s Owner” in “Placeholders”
Change Class as “UIApplication” in “Identity Inspector”
6. Drag “Object” in the library into “Objects” panel on the left
7. Change the class of the Object as your delegate class, such as “DemoAppDelegate”
(The name of object will be automatically change like “Demo App Delegate”)
8. Drag “Window” in the library into “Objects” panel on the left

9. Open “DemoAppDelegate.h” in project navigator
10. Find below code

@interface DemoAppDelegate : UIResponder @property (strong, nonatomic)UIWindow *window; @end 

11. Change as below:

@interface DemoAppDelegate : UIResponder @property (strong, nonatomic) IBOutlet UIWindow *window; @end 

11. Open “MainWindow.xib” in project navigator
12. Click “File’s Owner” in “Placeholders”
13. Control-Drag “delegate” of “Outlets” in “Connections Inspector” to “Demo App Delegate” in “Objects”
14. Click “Demo App Delgate” in “Objects”
15. Control-Drage “window” of “Outlets” in “Connections Inspector” to “Window” in “Objects”

16. Open “Summary” of your project
17. Find “iPhone / iPod Deployment Info”
18. Change “Main Interface” as “MainWindow”

19. Open “DemoAppDelegate.m” in project navigator
20. Find below code

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. self.window.backgroundColor = [UIColor whiteColor];  [self.window makeKeyAndVisible]; return YES; } 

21. Change as below

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { //self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch. //self.window.backgroundColor = [UIColor whiteColor];  [self.window makeKeyAndVisible]; return YES; } 


http://www.trappers.tk/site/2011/06/16/mainwindow-xib/

In the XCode 4.2 beta, MainWindow.xib is no longer included by default in some project templates. This means that you have to get your application to work by writing some code, using another method, or by manually reconstructing MainWindow.xib. This post shows the latter. Let’s get started.

Start with Empty Application template

If you create a new project in XCode 4.2 beta, and choose the Empty Application template to start from, change nothing and try running it in your iPhone 5.0 simulator, you will see an empty – black – screen. The only thing you get from the template is an xAppDelegate.h and .m.

We will now reconstruct our own MainWindow.xib, to get started with development the way you’re used to. So the next thing we do is add a New File to the project. Choose iOS > User Interface > Empty as template.Add Empty Interface Builder documentNext, choose iPhone, next give it the name MainWindow (.xib will be added automatically). By the way, the name of the file is not very important, but it’s nice to choose MainWindow, because that’s familiar.

Select the new File we just created. What we have now is an empty design surface, in what used to be Interface Builder. Here we’re going to change some things.

The empty design surface of MainWindow.xib

  • Change the class of File’s Owner to UIApplication

Change class of File's Owner to UIApplication

  • Find Object in the Library and drag it onto the Objects pane on the left.

Add Object to the document

  • Change the class of that Object to the xAppDelegate class that was created by the template, you might also want to clear out the “Object” label.

Change class of the object to xAppDelegate

  • Add a Window to the Objects pane on the left.

Add a window to the document

Now, let’s bind it all together. To do this, we first need to change some of the code in the xAppDelegate.h. We have to add IBOutlet to the window property it has, so that we can  hook it up in Interface Builder. The xAppDelegate.h should read something like this:

@interface DemoAppDelegate :       UIResponder <UIApplicationDelegate> @property (strong, nonatomic) IBOutlet UIWindow *window; @end

Don’t forget to save the file, otherwise Interface Builder will not be able to pick up the Outlet. Next we continue editing the MainWindow.xib

  • Control-Drag from the delegate outlet of the File Owner to the xAppDelegate object.

Link the application delegate

  • Control-Drag from the window outlet of the xAppDelegate to the Window.

Link the window outlet of the app delegate

  • Just for this demo, I’m adding a label to the window.

Add a label for testing

We’re not done yet, but we’re almost there.

  • Navigate to the project, and in the Summary tab, select MainWindow as the Main Interface.

Set the Main Interface to MainWindow

You can now run the project in the Simulator, and the window should show up. However there’s one last thing you might want to clean up. In xAppDelegate.m, there was actually code that creates a window as well. Just put the method

- (BOOL) application:didFinishLaunchingWithOptions:

in comment.

we're done

 

 

I hope this helps to understand exactly how an iOS app starts. The next thing you should do is add a ViewController, and push it onto the MainWindow. I’m not going to cover that here. Please leave your feedback in the comments.

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