[fancy_pantser]

URL Schemes are the only way to communicate between apps. So to launch an app you'd need to know it's NSURL (for spotify it's "spotify") to build a URL and do: [[UIApplication sharedApplication] openURL:];

[andrewljohnson]

There are also App Extensions now, as of iOS8: https://developer.apple.com/library/prerelease/ios/documenta...