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# Transaction properties

These constants define the property keys used by [`value(forKey:)`](/documentation/QuartzCore/CATransaction/value(forKey:)) and [`setValue(_:forKey:)`](/documentation/QuartzCore/CATransaction/setValue(_:forKey:)).

## Topics

### Constants

[`let kCATransactionAnimationDuration: String`](/documentation/QuartzCore/kCATransactionAnimationDuration)

Duration, in seconds, for animations triggered within the transaction group.

[`let kCATransactionDisableActions: String`](/documentation/QuartzCore/kCATransactionDisableActions)

A key whose value indicates whether implicit actions for property changes made within the transaction group are suppressed.

[`let kCATransactionAnimationTimingFunction: String`](/documentation/QuartzCore/kCATransactionAnimationTimingFunction)

[`let kCATransactionCompletionBlock: String`](/documentation/QuartzCore/kCATransactionCompletionBlock)


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