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# addProgressMark(_:)

Adds the progress mark to the receiver.

```
func addProgressMark(_ progressMark: NSAnimation.Progress)
```

## Parameters

`progressMark`

A `float` value (typed as NSAnimationProgress) between 0.0 and 1.0. Values outside that range are pinned to 0.0 or 1.0, whichever is nearest.

## Discussion

A progress mark represents a percentage of the animation completed. When the animation reaches a progress mark, an [`animation(_:didReachProgressMark:)`](/documentation/AppKit/NSAnimationDelegate/animation(_:didReachProgressMark:)) message is sent to the delegate and an [`progressMarkNotification`](/documentation/AppKit/NSAnimation/progressMarkNotification) is broadcast to all observers. You might receive multiple notifications of progress advances over multiple marks.

## See Also

[`var currentProgress: NSAnimation.Progress`](/documentation/AppKit/NSAnimation/currentProgress)

The current progress of the animation.


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