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# animationTimingFunction()

Returns the timing function used for all animations within this transaction group.

```
class func animationTimingFunction() -> CAMediaTimingFunction?
```

## Return Value

An instance of `CAMediaTimingFunction`.

## Discussion

This is a convenience method that returns the [`CAMediaTimingFunction`](/documentation/QuartzCore/CAMediaTimingFunction) for the [`value(forKey:)`](/documentation/QuartzCore/CATransaction/value(forKey:)) value returned by the  [`kCATransactionAnimationTimingFunction`](/documentation/QuartzCore/kCATransactionAnimationTimingFunction) key.

---

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