Handle URL open from other apps in iOS

January 16
For short, declare UTImportedTypeDeclarations(for types that are not predefined as System Uniform Type Identifiers), CFBundleDocumentTypes in Info.plist, UIApplicationLaunchOptionsURLKey in

[launchOptions valueForKey:UIApplicationLaunchOptionsURLKey]


And for multitask apps, additionally respond to

(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation // for iOS 4.2+


or

(BOOL)application:(UIApplication *)application handleOpenURL:(NSURL *)url // for iOS 2.0+, deprecated.


One little trick to handle ALL file types:


	CFBundleDocumentTypes
	
		
			CFBundleTypeName
			All Files
			LSItemContentTypes
			
				public.data
				public.content