As we inch closer to the November release for iOS 4.2 on the iPad, Apple keeps pumping out new beta versions for the developer community. Beta 3 is released today, and I’m sure it will be as stable as Beta 2 that many of us have been using. Doesn’t look like there are many major improvements to this beta, but it appears there are some AirPrint improvements.
Feeling lucky and got a developer account? Login and share your thoughts on the latest beta!
Apple Developer Portal [link]
Release notes after the break:
iOS SDK 4.2 provides support for developing iOS applications and includes the complete set of Xcode tools, compilers, and frameworks for creating applications for iOS and Mac OS X. These tools include the Xcode IDE and the Instruments analysis tool among many others.
With this software you can develop applications that run on iPhone, iPad or iPod touch running iOS 4.2. You can also test your applications using the included iPhone Simulator, which supports iOS 4.2. Installing iOS SDK 4.2 requires a Macintosh computer running Mac OS X 10.6.4 (Snow Leopard) or later.
For more information and additional support resources, visit:
Please report any bugs not mentioned in the “Notes and Known Issues” section using the Apple Bug Reporter on the Apple Developer website at: http://developer.apple.com/bugreporter/. Additionally, you may discuss these issues and iOS SDK 4.2 in the Apple Developer Forums: http://devforums.apple.com.
Notes and Known Issues
The following issues relate to using the 4.2 SDK to develop code.
- There is a new Base SDK setting called “Latest SDK”. This is the recommended choice for all projects and will cause your project to always build against the newest available iOS SDK.
- The Overview popup menu will display “Base SDK Missing” if a project was created with an SDK earlier than iOS SDK 4.2. However, after selecting a new SDK that Overview popup may still display “Base SDK Missing”.To work around the issue, close and reopen the project window.
- The iPad screen rotation lock switch now functions as a sound/silent switch in iOS 4.2. This switch behaves the same way as the ring/silent switch on iPhone.Applications targeted for iPad will need to take this into account when implementing audio behaviors.
- Calendar can now import
.icsfiles directly as a way to add events. If your app has access to
.icsfiles, you should test importing them using the
If you are using the “LLVM Compiler” (a.k.a. Clang) you may experience problems with exception handling in Objective-C that manifest as exceptions not being caught in the appropriate places.
To work around this issue, add the
-fexceptionsoption explicitly to the Other C Flags build setting of your Xcode project.
- Books bought from the Apple iBookstore fail to load in iBooks because “the requested resource is missing”.
- Applications can use the
GKFriendRequestComposeViewControllerclass to initiate friend requests.
- The GameKit view controllers for leaderboards, achievements, matchmaking, and friend requests must be presented modally. Presenting them any other way will result in an exception and unexpected behavior. This affects
- For applications built against iOS 4.2 and later, MapKit will now conditionally display annotation views based on the currently visible region of the map. To account for this, developers should make sure they reuse annotation views as documented and never assume that the absence of an annotation view implies the absence of a corresponding annotation
- iOS 4.2 devices can print wirelessly to printers that support AirPrint, including:
- HP Photosmart Premium Fax e-All-in-One Printer – C410
- HP Photosmart Premium e-All-in-One Printer series – C310
- HP Photosmart Plus e-All-in-One Printer series – B210
- iOS 4.2 devices can print to printers shared through a Mac or a PC.
- For iOS 4.2 beta 3, testing printing requires:
- A printer that supports AirPrint, running the latest available firmware
- A printer shared through a Mac running Mac OS X 10.6.5 beta, available on the iOS developer page
- A printer shared through a PC running iTunes 10.1 beta, available on the iOS developer page
- Building an app that weak links
CoreVideo.frameworkagainst the 4.2 Simulator SDK and then running that application against the 3.2 Simulator will result in a crash. The same configuration will work when building against the 4.2 device SDK and running on a 3.2 device.
- The following frameworks currently do not support weak linking by way of the
When targeting older versions of iOS, you can check the class availability in these frameworks by calling the
NSClassFromStringfunction and seeing if it returns a non-
nilvalue. For information about using the
NS_CLASS_AVAILABLEmacro, see “iOS 4.2” in What’s New in iOS.
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