Many information about development for iPad in one place

Vladimir Boychentsov — Wed, 27 Jan 2010 23:23:40 +0000

From Apple Site

Changing an iPhone Executable’s working directory from “Build Products directory” may cause the application not to install properly with the error message “The Info.plist for application at (null) specifies a CFBundleExecutable of (null), which does not exist.”
You may only use .png files for application icons for the device.
The iPhone SDK is designed for Intel-based Macs and is not supported on PPC-based Macs.
When running and debugging on a device, be sure to turn off Passcode lock.
Trying to debug two applications at the same time on the same device fails with a broken pipe error in the debugger console.

CGFontCreateWithFontName can hang in some circumstances when using the UIAppFonts key in the Info.plist.

To support external localization tools and workflows, Interface Builder 3.2.2 supports an option to save iPhone documents in an editable NIB format. Additionally, the Xcode build settings “Flatten Compiled XIB Files” and “Strip NIB Files” now apply to iPhone Interface Builder documents in the same way they apply to Mac OS X documents. By default, NIB files will be stripped when built.
iPhone OS 3.2 supports loading unstripped NIB files, but iPhone OS releases prior to 3.2 do not. If you choose to build unstripped NIB files to support a localization workflow, you should either use ibtool’s –strip command to strip NIB files after localizing, or temporarily revert the “Flatten Compiled XIB Files” and “Strip NIB Files” build settings to build NIBs compatible with previous iPhoneOS releases.
Building an iPhone application that uses UITableViewCell objects encoded in XIB files and then running that application in the simulator or on a device with a version less than 3.2 will result in a runtime exception. To workaround this, use the simulator with the 3.2 SDK.

Previously, directions URLs were handed as a single point-to-point request. In iPhone OS 3.2, it is handled as 2 sets of search queries and results, which can be run concurrently. The Maps UI for spellchecking, refinements and map pan/zoom now support concurrent searches.

If an MPMoviePlayerController object is set to full screen before calling presentMoviePlayerViewControllerAnimated:, the movie will not properly play fullscreen.
The simulator window incorrectly rotates to portrait when an MPMoviePlayerController object enters fullscreen from landscape.
The MPMoviePlayerPlaybackDidFinishNotification notification is not sent from the Done button when a movie is launched non-fullscreen and switched to fullscreen.
An MPMoviePlayerController object does not behave properly when content is programmatically changed.
Exiting fullscreen mode of an MPMoviePlayerController object’s movie does not return the movie to its view frame.

The Message UI framework exports class names without prefixes, which can cause namespace confusion. If you are using the Message UI framework, watch for compiler warnings about duplicate symbols. To avoid namespace issues, you can add prefixes to your own class names.

Running an Interface Builder-rotated window in the Simulator may result in an incorrectly simulated window orientation. Using Build & Run in Xcode works around this issue.
Some icons may appear squared off in the Simulator because their mask isn’t being used properly.
The split view template app doesn’t show the ‘Master List’ button upon initial launch in portrait orientation. Rotating the simulator to landscape, then back to portrait, shows the button.

A UIPopoverController object’s content size should not be smaller than 320pt or wider than 600pt.
The MPMediaPickerController and UIImagePickerController classes are not supported from the presentModalViewController:animated: method of UIViewController. These pickers should instead be displayed using a UIPopoverController object.