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.

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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