Safe DispatchQueue.main.sync (Swift3.0)

file.swift

extension DispatchQueue {
    class func mainSyncSafe(execute work: () -> Void) {
        if Thread.isMainThread {
            work()
        } else {
            DispatchQueue.main.sync(execute: work)
        }
    }

    class func mainSyncSafe<T>(execute work: () throws -> T) rethrows -> T {
        if Thread.isMainThread {
            return try work()
        } else {
            return try DispatchQueue.main.sync(execute: work)
        }
    }    
}

Nice!

Did you know that you can do stuff like this?

let x = DispatchQueue.main.sync {
    return 10
}

I modified your gist to cater for that. Here's mine:

func syncSafe<T>(_ work: () -> T) -> T {
    if Thread.isMainThread {
        return work()
    } else {
        return DispatchQueue.main.sync {
            return work()
        }
    }
}