Watch all notifications posted to Notification Center

LogNotifications.swift

// Place this early in your application's startup process, such as an init

let cb: CFNotificationCallback = { (centre: CFNotificationCenter?, observer: UnsafeMutableRawPointer?, name: CFNotificationName?, object: UnsafeRawPointer?, userInfo: CFDictionary?) in
    print("Notification: ", terminator: "")
    if let name = name {
        print("(\(name.rawValue)) ")
    } else {
        print()
    }

    if let obj = observer {
        let obj2: AnyObject = Unmanaged.fromOpaque(obj).takeUnretainedValue()
        if let obj3 = obj2 as? NSObject {
            print("  observer: \(obj3.debugDescription)")
        }
    }

    if let obj = object {
        let obj2: AnyObject = Unmanaged.fromOpaque(obj).takeUnretainedValue()
        if let obj3 = obj2 as? NSObject {
            print("    object: \(obj3.debugDescription)")
        }
    }

    if let userInfo = userInfo {
        print("\(userInfo)")
    }
}

CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), nil, cb, nil, nil, .deliverImmediately)