iOS 13 CATransform3D issues

问题

Prior to the release of iOS 13, I had had some CATransform3D code inside a UIView.animate block. In iOS 12, the result of the transformation animation looked like this: https://youtu.be/mfIzjjlKOBM. In iOS 13, the same transformation code now gives this result: https://youtu.be/hQdyGactIfA.

As you can see in iOS 13 the animation is no longer a fluid cube movement like it is in iOS 12. Here's my basic code:

UIView.animate(withDuration: duration, delay: 0, options: .curveEaseOut, animations: {
    view.layer.transform = entryTransformation
    view.alpha = 1
    previousElementView.layer.transform = exitTransformation
    previousElementView.alpha = 0.2
}, completion: nil)

And here are what the values look like for entryTransformation and exitTransformation (screen height is 896). Both of the transformation values (and anchor points) remain exactly the same from iOS 12 to iOS 13.

   // entryTransformation
   // anchor point: (x: 0.5, y: 0.5)
   CATransform3D
      - m11 : 1.0
      - m12 : 0.0
      - m13 : 0.0
      - m14 : 0.0
      - m21 : 0.0
      - m22 : 1.0
      - m23 : 0.0
      - m24 : 0.0
      - m31 : 0.0
      - m32 : 0.0
      - m33 : 1.0
      - m34 : 0.0
      - m41 : 0.0
      - m42 : 0.0
      - m43 : 0.0
      - m44 : 1.0


   // exitTransformation
   // anchor point: (x: 0.5, y: 0.0)
   CATransform3D
      - m11 : 1.0
      - m12 : 0.0
      - m13 : 0.0
      - m14 : 0.0
      - m21 : 0.0
      - m22 : 0.896
      - m23 : -1.0
      - m24 : 0.001
      - m31 : 0.0
      - m32 : 1.0
      - m33 : 0.0
      - m34 : 0.0
      - m41 : 0.0
      - m42 : 896.0
      - m43 : 0.0
      - m44 : 1.0

Here is what each of the layers transform properties look like just before calling the animation (again, these values remain the same in both iOS versions):

   // for the view/layer entering the scene
   // anchor point: (x: 0.5, y: 1.0)
   CATransform3D
      - m11 : 1.0
      - m12 : 0.0
      - m13 : 0.0
      - m14 : 0.0
      - m21 : 0.0
      - m22 : -0.896
      - m23 : -1.0
      - m24 : -0.001
      - m31 : 0.0
      - m32 : -1.0
      - m33 : 0.0
      - m34 : 0.0
      - m41 : 0.0
      - m42 : -896.0
      - m43 : 0.0
      - m44 : 1.0


   // for the view/layer exiting the scene
   // anchor point: (x: 0.5, y: 0.5)
   CATransform3D
      - m11 : 1.0
      - m12 : 0.0
      - m13 : 0.0
      - m14 : 0.0
      - m21 : 0.0
      - m22 : 1.0
      - m23 : 0.0
      - m24 : 0.0
      - m31 : 0.0
      - m32 : 0.0
      - m33 : 1.0
      - m34 : 0.0
      - m41 : 0.0
      - m42 : 0.0
      - m43 : 0.0
      - m44 : 1.0

I am not sure what changes Apple made to Core Animation around the CATransform3D struct (if any) but I was wondering if anyone else is experiencing this type of issue and/or knows a work around.

Thanks for reading.

来源：https://stackoverflow.com/questions/58514193/ios-13-catransform3d-issues

标签

swift

uiviewanimation

ios13

catransform3d