Handle URL open from other apps in iOS

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…

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