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The `rate` parameter in IAnimatable.Animate() method doesn't take effect
C#, Xamarin, Xamarin.Forms, iOS, Android
The `rate` parameter in IAnimatable.Animate(string name, Animation animation, uint rate = 16, uint length = 250, Easing easing = null, Action finished = null, Func repeat = null) method doesn't take effect.
I have read Xamarin.Forms' source code at [AnimationExtensions.cs](https://github.com/xamarin/Xamarin.Forms/blob/bd31e1e9fc8b2f9ad94cc99e0c7ab058174821f3/Xamarin.Forms.Core/AnimationExtensions.cs) and only the Info Class has used the `rate` parameter but do nothing
it seems that Xamarin.Forms used the system ticker to implement animation on each platform( ValueAnimator on Android and CADisplayLink on iOS) so the `rate` parameter has no effect to the animation...
I don't know if I am right about this, but this `rate` parameter really confused me for a long time because the docs explains it as followed:
> rate UInt32
The time, in milliseconds, between frames.
### Steps to Reproduce
1. Add an ProgressBar and use the Animate() method with `rate` set to 20.
2. Run the app and then change the `rate` to 2000.
3. Run the app again and there is no difference with the animation's rate.
### Expected Behavior
The animation's rate changes when the `rate` parameter has changed.
### Actual Behavior
The animation's rate doesn't change when the `rate` parameter has changed.
### Basic Information
- Version with issue: Test on 188.8.131.52452
- Last known good version: NULL
- IDE: VS 2017
- Platform Target Frameworks:
- Android Support Library Version:
- Nuget Packages:
- Affected Devices:
### Reproduction Link
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