Find out your installed iOS SDK version

• Go to your /Developer folder.
• There should be an “About Xcode and iPhone SDK.pdf” file with informations about the installed version.

Download old Apple iOS Versions

You need an Apple developer account to login!

You can get some old links to work by changing http://developer.apple.com/iphone/… to http://developer.apple.com/ios/…

iPhone SDK 3.1.3 with XCode 3.1.4 for Leopard (10.5.7)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.1.4__leopard__9m2809a.dmg

iPhone SDK 3.1.3 with XCode 3.2.1 for Snow Leopard (10.6.0)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.1.3__final/iphone_sdk_3.1.3_with_xcode_3.2.1__snow_leopard__10m2003a.dmg

iPhone SDK 3.2 Final with Xcode 3.2.2 for Snow Leopard (10.6.0)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_3.2__final/xcode_3.2.2_and_iphone_sdk_3.2_final.dmg

Xcode 3.2.3 and iPhone SDK 4 GM seed for Snow Leopard (10.6.2)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_4_gm_seed/xcode_3.2.3_and_iphone_sdk_4_gm_seed.dmg

Xcode 3.2.3 and iPhone SDK 4 Final for Snow Leopard (10.6.2)
http://developer.apple.com/ios/download.action?path=/iphone/iphone_sdk_4__final/xcode_3.2.3_and_iphone_sdk_4__final.dmg

Xcode 3.2.3 and iOS SDK 4.0.1 for Snow Leopard (10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.0.1__final/xcode_3.2.3_and_ios_sdk_4.0.1.dmg

Xcode 3.2.3 and iOS SDK 4.0.2 for Snow Leopard (10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.0.2__final/xcode_3.2.3_and_ios_sdk_4.0.2.dmg

Xcode 3.2.4 and iOS SDK 4.1 for Snow Leopard (10.6.4)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.1__final/xcode_3.2.4_and_ios_sdk_4.1.dmg

Xcode 3.2.5 and iOS SDK 4.2 beta 3 for Snow Leopard (requires Mac OS X v10.6.5 pre-release)
http://developer.apple.com/ios/download.action?path=/ios/ios_sdk_4.2_beta_3/xcode_3.2.5_and_ios_sdk_4.2_beta_3.dmg

Change Apple-Keyboard Layout

• create a text file with the name “PC Layout german.keylayout” with the content of this file: PC.keylayout

• copy the file into the folder:

~/Library/Keyboard Layouts/

• restart your mac
• In your system “Language and Text” settings you can choose the new layout on the “Input Sources” tab
• activate the “Show Input menu in menu bar” checkbox
• you can select the new keyboard layout from the menu bar

• Keybindings:

Command	Character
shift-7	/
shift-alt-7 or alt-ß	\
alt-5 or alt-8	[
alt-6 or alt-9	]
alt-<	|
alt-7	{
alt-q	}
alt-0	@
alt-+	~
fn-backspace	del command
ctrl-z	undo command
ctrl-shift-z	redo command

iPhone & iPad Prototyping

• Balsamiq lets you create nice iPhone Mockups within a few minutes.
• With Realizer you can create an interactive prototype of your iPhone or iPad app simply by uploading your sketches or screen mockups.
• Create mobile web applications and Web sites for iPhone and iPad with MobiOne Studio. You can use this to create a prototype of your app, too.

iPhone

• here you can create simple iPhone mockups online and share it by sending the URL
• with mockingbird you can create mockups online, too
• with MockApp you can create mockups on your Mac
• with MobiOne Studio you can create mockups on your Windows PC
• here you can get a collection of vector iPhone UI elements for Fireworks CS3 and CS4 and here some for Illustrator
• here, here and here you can find nice iPhone 4 vector illustrations
• here some stencils for Photoshop (iPhone 4) and here for OmniGraffle

iPad

• here you can get a some stencils for Photoshop and here for OmniGraffle
• here you can get a collection of vector iPad UI elements for Illustrator
• you can find more links and stuff here

Differentiate between iPhone, iPad and simulator

#if TARGET_IPHONE_SIMULATOR
// simulator specific code
#elif TARGET_OS_IPHONE
// iPhone specific code
#elif TARGET_OS_IPAD
// iPad specific code
#else
// Unknown target
#endif 

Differentiate between iOS versions

Depending on your project settings Base SDK you can use the following code:

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
// Do something for iOS > 4.0
#else
//Do something for iOS < 4.0
#endif

Text difference analyzer on Mac

• KDiff3
• Meld