Accessing the current position of UIView during animation

You can use the presentationLayer - a property of the CALayer that "provides a close approximation to the version of the layer that is currently being displayed". Just use it like this:

CGRect projectileFrame = [[projectile.layer presentationLayer] frame];

Swift 5: Get temporary position and size (CGRect) during the animation with:

let currentFrame = projectileFrame.layer.presentation()!.frame