Type Method


Creates a custom sound object for critical alerts.


class func criticalSoundNamed(_ name: UNNotificationSoundName) -> Self



The name of the sound file to play. This file must be located in the current executable’s main bundle or in the Library/Sounds directory of the current app container directory. If files exist at both locations, the system uses the file from the Library/Sounds directory. This parameter must not be nil.

Return Value

A sound object representing a custom critical alert sound.


Critical alerts ignore the mute switch and Do Not Disturb. They require a special entitlement issued by Apple.

See Also

Getting Critical Sounds

class var defaultCritical: UNNotificationSound

The default sound used for critical alerts.

class func defaultCriticalSound(withAudioVolume: Float) -> Self

Creates a sound object that plays the default critical alert sound at the specified volume.

class func criticalSoundNamed(UNNotificationSoundName, withAudioVolume: Float) -> Self

Creates a custom sound object for critical alerts with the specified volume.