Disabling NSLog For Production In Swift Project

Question

So this answer Do I need to disable NSLog before release Application? gives a great way to disable NSLog in a production environment, but unfortunately, this solution does n

Answer 1

I agree with uclagamer's answer, which is essentially a souped up print function wrapped in a preprocessor conditional:

func gLog(@autoclosure object: () -> T, _ file: String = __FILE__, _ function: String = __FUNCTION__, _ line: Int = __LINE__)
    {
    #if DEBUG
        let value = object()
        let stringRepresentation: String

        if let value = value as? CustomDebugStringConvertible
            {
            stringRepresentation = value.debugDescription
            }
        else if let value = value as? CustomStringConvertible
            {
            stringRepresentation = value.description
            }
        else
            {
            fatalError("gLog only works for values that conform to CustomDebugStringConvertible or CustomStringConvertible")
            }

        let fileURL = NSURL(string: file)?.lastPathComponent ?? "Unknown file"
        let queue = NSThread.isMainThread() ? "UI" : "BG"
        let gFormatter = NSDateFormatter()
        gFormatter.dateFormat = "HH:mm:ss:SSS"
        let timestamp = gFormatter.stringFromDate(NSDate())

        print("\(timestamp) \(queue) = \(fileURL) | \(function)[\(line)]: " + stringRepresentation)
    #endif
    }

This is updated for Swift 2.0. All credit goes to Abider Nasir. His original blog post (and linked gist) can be found here:

http://abizern.org/2015/02/01/debug-logging-in-swift/

IMPORTANT NOTE: if anyone is struggling to find the "Swift Compiler - Custom Flags section of Build Settings", which has been mentioned many, many times, you need to make sure that "All" build settings are shown, not just the "Basic" build settings, as is the default.