Swift double unwrapping of Optionals
The problem is that NSWorkspace().runningApplications returns anarray of AnyObject which has to be cast to an array of NSRunningApplication:
let apps = NSWorkspace().runningApplications as! [NSRunningApplication]let filteredApps = apps.filter { $0.activationPolicy == NSApplicationActivationPolicy.Regular}for app in apps { let name: String = app.localizedName!}
Here's why: app is of type AnyObject (id in Objective-C), and doing any lookup on AnyObject introduces a layer of optionality because of the possibility that the method doesn’t exist on the object. localizedName is itself Optional, so you end up with two levels of optional: the outer level is nil if the object doesn’t respond to localizedName, and the inner is nil if 'localizedName' is nil.