Errata for iOS SDK Development

#49940: Second paragraph, it says that the class name that contains the "SLServiceTwitter" constant is "SLServiceRequest", but the class name shown in the actual iOS 6.0 documentation is called "SLRequest". The next paragraph correctly states the name of the class as "SLRequest".--Enrique Delgado

#50333: "By default, protocol methods are optional, but they can be made mandatory" should state the opposite:

"By default, protocol methods are mandatory, but they can be made optional"--Guido Soranzio

#49956: The square braces indicate that we're sending an Obj-C message, with the SLComposeViewController class as the target that receives the message and canSendTweet as the selector that defines the message.
Wrong: canSendTweet
Correct: isAvailableForServiceType--Marco Antonio Rojo Marcondes

#50181: In the code block, dismissing the tweet view controller (Line #11) is dependent on the user clicking 'Send'. When clicking 'Cancel', the view controller isn't dismissed.

Moving the dismiss code out of the 'if' statement will dismiss the view controller in either case – as in:

[self dismissViewControllerAnimated:YES completion:NULL];
if (SLComposeViewControllerResultDone == result) {
[self reloadTweets];
}
--Per Salomonsen

#50183: The implementation of handleTwitterData:urlResponse:error: doesn't clear the contents of twitterTextView before generating it anew. If the "Show my tweets" button is pressed before tweeting, the new tweet won't be displayed at the top, but rather in the middle.--Per Salomonsen

#50065: In 4.1 Practicing MVC.
I think you need to add:
#import "PRPRecipe.h"
at the top of PRPViewController.h so the property can resolve the reference to PRPRecipe--Armando Flores

#50740: I have no idea what is meant by "Import the PRPRecipe.h filename and..." in the middle of the page. Assuming we continue from chapter 4, I already have a PRPRecipe.h file. What's more the very next code sample refers to the code in PRPAppDelegate.m. But then on the next page, there's only 7 lines for this code file, and it doesn't include the samples from the previous page. I'm a bit lost!--homercycles

#50203: When adding the 'recipes' property to the new PRPRecipeDocument class, the book fails to note that the property getter should be copied from PRPRecipesSource (or implemented) in order to create the 'recipes' array lazily. Failing to implement that property getter will result in the following error when updating the table view: 'attempt to insert row 0 into section 0, but there are only 0 rows in section 0 after the update.'--Per Salomonsen

#50205: In the section "Refine the Document" it says: "If you delete the app from the simulator and then rerun it from Xcode, you'll notice that our document fails to open."

This is no longer true, because of the initWithFileURL: method inserted on page 160, which proactively creates the document on disk, if it doesn't exist when the document is initialized.

The handleError:userInteractionPermitted: method is not called with an NSFileReadNoSuchFileError, even when deleting the application (and it's document) from the simulator before running the application.--Per Salomonsen

#49908: Xcode 4.5: Starting with the "DocumentRecipies_start" code and then working through page 170, up to Refine the Document: If you run the code from the DocumentRecipies_start folder, the app will crash when attempting to insert a new recipe into the recipes list. If you rename the folder to "DocumentRecipies" it will behave correctly. I tried replacing all of my files with the DocumentRecipies_01 files and it still crashed if the main folder is titled "DocumentRecipies_start".
--J. Lincoln Barr

#50259: PRPRecipesDocument.m is missing "recipes" property initialization for those following along writing their own code. The book says on page 160, paragraph 2, "We need to ensure that we have an array ready in which to store recipes when the document is created, so let’s override the initWithFileURL: method." However, the initWithFileURL method doesn't create the array which causes an error when trying to save a new recipe in the simulator.

Perhaps the sample code for PRPRecipesDocument.m should include a line to initialize the recipes property, e.g. "self.recipes = [NSMutableArray array]" in the 'if (self) {}" block.--Alfred Lau

#49925: In the middle of the page: "Tap the Add button on the bottom right..." should be "Tap the Add button on the bottom left..." It is located there in Xcode 4.5.1. The same statement appears on following pages.--J. Lincoln Barr

#50616: My test script kept failing at the step where it was supposed to click the prep time stepper. With the keyboard on the screen, it couldn't find the Increment button to push it.

By adding this line right below the line that set the recipe title, I was able to dismiss the keyboard and have the script finish successfully:

target.frontMostApp().keyboard().elements()["Return"].tap();

Perhaps this should be added in to the book's code?--Ron Toland