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BOOK: Beginning iOS 4 Application Development
This is the forum to discuss the Wrox book Beginning iOS 4 Application Development by Wei-Meng Lee; ISBN: 978-0-470-91802-9
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Old January 11th, 2011, 02:05 PM
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Default Ch. 4 Tab Bar Application

I am experiencing a persistent crash with the Book's code. This happened in my build after Step 6, page 129. I then opened the book's project, set the base SDK to 4.2. Then double-clicked the MainWindow.xib and have three alert windows open with Assertion Failure: Show Details, Crash, Continue.

Thoughts?
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Old February 21st, 2011, 05:08 PM
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Default I have the same issue

I am able to follow the instructions on pages 126 through 129. I am able to run the application successfully. However, as soon as I close the MainWindow.xib and reopen it, I get an error from interface builder. I am no longer able to edit the MainWindow.xib in interface builder.

However, I am still able to run the application.
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Old February 22nd, 2011, 01:41 PM
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Default

This may seem rather bizarre, but try this.
Redo the code, but don't add the badge to the Search tab item.
Again, I don't have this book, but the project appears to be identical to the one in the author's previous book. That code was fine back in August, when I did the project, but now has the same issues. The downloaded code can be made to work by deleting the MainWindow.xib then setting it up again (Add File>New File>User Interface>Application XIB, add the Tab Bar Controller make the necessary changes (setting nibs etc) and connections, save and Build & Run). The program, Xcode and Interface Builder can be quit. The project can be reopened edited etc, as long as the badge is not added. Once the badge is added, the assertion failure will occur if the file is closed then reopened in Interface Builder. Fortunately the badge is just window dressing and can added in code if wanted.
Let me know if this solves the problem for you.
Bob

addendum:
add the following to the appDelegate to display the badge and avoid the assertion failure

Code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
    // Override point for customization after application launch.
	NSArray *controllerList = [tabBarController viewControllers];
	[[[controllerList objectAtIndex:2] tabBarItem] setBadgeValue:@"5"];

    // Add the tab bar controller's view to the window and display.
    [self.window addSubview:tabBarController.view];
    [self.window makeKeyAndVisible];

    return YES;
}
or more encapsulated

In the appDelegate

Code:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    
    // Override point for customization after application launch.
	NSArray *controllerList = [tabBarController viewControllers];
	
	[[controllerList objectAtIndex:2] initWithNibName:nil bundle:nil];

    // Add the tab bar controller's view to the window and display.
	
    [self.window addSubview:tabBarController.view];
    [self.window makeKeyAndVisible];

    return YES;
}
and in SearchViewController.m

Code:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        [[self tabBarItem] setBadgeValue:@"5"];
    }
    return self;
}

Last edited by thepianoguy; February 23rd, 2011 at 01:12 AM..
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Old March 15th, 2011, 01:44 AM
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Default Found this issue as well

I came across this issue as well and after much fighting (and before I found these posts) I figured out that it was the badge setting causing the assertion failure in IB. Does anyone know if this was determined to be a result of a bug in IB / XCode or anything? I'm wondering if this has been reported so it might be addressed in the future (although I don't see why you'd want to set badge values as defaults in IB like this and would normally do it through code anyway). Frustrating to fight through it like this but that is how you learn I suppose.
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Old March 15th, 2011, 07:30 AM
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Default

I think the crash reports go to Apple, so they would be made aware of the problem in this manner. Also, for what it is worth, the program can be opened and edited as written in Xcode 4, so what ever was causing the assertion failure has been resolved.

Bob
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