Disable app nap in Swift

Question

How do I disable app nap in Swift? Im new to programming and I am building a timer(just for practice), and I am afraid app nap will break my timer.

Answer 1

I found that this solution works in Swift as well.

Create a class or global variable

var activity: NSObjectProtocol?

And assign it after which App Nap will be disabled

activity = NSProcessInfo().beginActivityWithOptions(NSActivityOptions.UserInitiated, reason: "Good Reason")

Answer 2

Swift 4.x / 5.3:

For ProcessInfo.ActivityOptions, Apple's documentation describes:

static var userInitiated

Flag to indicate the app is performing a user-requested action.

static var userInitiatedAllowingIdleSystemSleep

Flag to indicate the app is performing a user-requested action, but that the system can sleep on idle.

Unless your intention is to prevent the system from sleeping, you should use userInitiatedAllowingIdleSystemSleep.

Steps

1. Retain reference in a scope that will survive until any point you may want to revert the change (ie: within AppDelegate)

    var activity: NSObjectProtocol?
   

2. Run this, possibly in AppDelegate applicationDidFinishLaunching:

    activity = ProcessInfo.processInfo.beginActivity(options: .userInitiatedAllowingIdleSystemSleep, reason: "Good Reason")
   

To cancel and re-enable App Nap at any time:

if let pinfo = activity {
    ProcessInfo.processInfo.endActivity(pinfo)
}