PreventSleep is a simple library to prevent a Mac from allowing a display to sleep, or from prevent idle sleep.

It differs from another common approach on Mac which is to handle a caffeinate process.

import PreventSleep
import IOKit.pwr_mgt

let preventSleep = PreventSleep(
    sleepAssertionMsg: "Prevent idle sleep when playing audio.",
    sleepAssertionType: kIOPMAssertionTypeNoIdleSleep
)!

preventSleep.preventSleep()

sleep(10)

preventSlep.allowSleep()

To check that the power assertion was correctly created/removed, run pmset -g assertions and look for your assertion.

Carthage

github "jesse-c/PreventSleep" ~> VERSION_NUMBER

Initialisation

PreventSleep(sleepAssertionMsg: String, sleepAssertionType)

sleepAssertionMsg: String is the message that will be attached to the power assertion. sleepAssertionType: String is either kIOPMAssertionTypeNoIdleSleep or kIOPMAssertionTypeNoDisplaySleep which are available after importing IOKit.pwr_mgt.

Prevent sleeping

preventSleep() -> Bool

Indefinitely prevents the type of sleep specified. Returns true if a power assertion was create successfully, false otherwise.

Allow sleeping

allowSleep() -> Bool

Allow the Mac to go to sleep following the user's energy prefernces. Returns true if a power assertion was removed successfully, false otherwise.

Check current sleeping status

canSleep() -> Bool

Returns true if there is currently no power assertion preventing sleeping, false otherwise.

See Contributing.