Chapter 4: windowBasedApp example

lukasbradley · January 24th, 2011, 01:40 PM

All,

I've gone through the windowBasedApp example starting on page 85 twice now, with no success. When I run the application I get the same blank white screen as when I run the application on step 2.

I'm using Simulator 4.2.

Does anyone else have any issues with this application? I've double checked everything to ensure I've followed the example. Has anyone gotten it to work?

EDIT: What makes this especially frustrating is that the rest of the examples in Chapter 4 build of this project. So if it doesn't work, the rest probably won't.

Thanks for any and all help.

Lukas

thepianoguy · January 24th, 2011, 02:51 PM

I do not have this book but the identical project was in a previous book. There were omissions in the project as presented in the previous book, and it is possible the same errors persist.
First:
Make sure you save all changes you make in Interface Builder. This is not specified in the steps in the other book.
When making edits in the windowBasedAppAppDelegate.h a few lines that should have been bold were
not in bold type

Code:

@class HelloWorldViewController;
HelloWorldViewController *viewController;
@property (nonatomic, retain) IBOutlet HelloWorldViewController *viewController;

If these errors have not been corrected in the new book, then the project will not work.
Bob

DrakeC · January 24th, 2011, 02:54 PM

Same problem for me...haven't figured it out yet.

DrakeC · January 24th, 2011, 03:03 PM

OK...I figured out what the problem was for me.

In step 12, after control-click and drag the Window Based App App Delegate item to the Hello World View Controller item, you need to select viewController in the popup. I didn't do that the first time - missed it in the instructions.

Hope it helps.

lukasbradley · January 24th, 2011, 03:15 PM

Quote:

Originally Posted by DrakeC

OK...I figured out what the problem was for me.

In step 12, after control-click and drag the Window Based App App Delegate item to the Hello World View Controller item, you need to select viewController in the popup. I didn't do that the first time - missed it in the instructions.

Hope it helps.

I'm certain I've done this, and saved. Are you saying that it all DOES work for you?

Are you using SDK 4.2 or 4.0?

lukasbradley · January 24th, 2011, 03:22 PM

Quote:

Originally Posted by thepianoguy

I do not have this book but the identical project was in a previous book. There were omissions in the project as presented in the previous book, and it is possible the same errors persist.
First:
Make sure you save all changes you make in Interface Builder. This is not specified in the steps in the other book.
When making edits in the windowBasedAppAppDelegate.h a few lines that should have been bold were
not in bold type

Code:

@class HelloWorldViewController;
HelloWorldViewController *viewController;
@property (nonatomic, retain) IBOutlet HelloWorldViewController *viewController;

If these errors have not been corrected in the new book, then the project will not work.
Bob

Hey Bob, thanks for the reply.

Yes, all of these lines are in boldface in the new book, and I included them in my code.

lukasbradley · January 24th, 2011, 03:28 PM

I downloaded the example code from the WROX site, and attempted to run the project. Unfortunately, it is hard-coded to use SDK 4.0. I can't figure out how to download older SDKs from Apple, and I'm extremely unfamiliar with the project structure to switch it to 4.2. However, I'll let everyone know if I'm successful on this path.

EDIT 1: Well, I figured out how to change the links to the Frameworks in the project, but it wouldn't build until I re-loaded the project. Unfortunately, the code is the LAST version of the project. As I noted before, the first example is used in later examples from that chapter. I guess my next step is to continue my version of the project and pray that it works on the next example.

lukasbradley · January 24th, 2011, 09:24 PM

All, thank you much for your replies.

I went back through the example a third time, saving after EVERY edit I did, and that worked. I'm assuming my problem as not saving each of the Interface Builder edits.

Apologies for the "user error" post. Thanks again.

thepianoguy · January 25th, 2011, 12:36 AM

Glad you got the project to work.
Updating the SDK is covered in some other threads. It is always good to see if the topic has come up before.
Hello World - Old SDK?
no sdk with the name or path 'iphone.4.'

Your problem sounded like an Interface Builder problem. Just make a habit of saving changes in Interface Builder when ever you switch back to Xcode and vice versa.
Good luck with the rest of the book.
Bob

tleveque · May 17th, 2011, 09:21 PM

I am also unable to make it work!

I did it twice with the same result.
And yes I did a save after each edition of .xib files...

I started suspecting something is not going well at step 9, when they ask to select HelloWorldViewController as NIB name. For me, the drop down list was empty!
So I typed it manually.

I also supposed XCode should be able to autocomplete the class name after the @class. I am right? If yes, there is no HelloWorldViewController in my autocompletion list...

I double and even tripple check all my code and it still does not work.
No compilation errors or any warning. The iPhone Simulator just show a blank screen....

I am using XCode 4. But it should not make any difference I think.

Any idea someone?