50 lines
1.8 KiB
Swift
50 lines
1.8 KiB
Swift
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enum PresentationStepChangeAnimation {
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case none
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case slide
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case slideAndBounce
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}
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final class ModalPresentationAnimator {
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private enum Constants {
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static let animationDuration: TimeInterval = kDefaultAnimationDuration
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static let springDamping: CGFloat = 0.8
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static let springVelocity: CGFloat = 0.2
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static let controlPoint1: CGPoint = CGPoint(x: 0.25, y: 0.1)
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static let controlPoint2: CGPoint = CGPoint(x: 0.15, y: 1.0)
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}
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static func animate(with stepAnimation: PresentationStepChangeAnimation = .slide,
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animations: @escaping (() -> Void),
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completion: ((Bool) -> Void)?) {
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switch stepAnimation {
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case .none:
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animations()
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completion?(true)
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case .slide:
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let timing = UICubicTimingParameters(controlPoint1: Constants.controlPoint1,
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controlPoint2: Constants.controlPoint2)
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let animator = UIViewPropertyAnimator(duration: Constants.animationDuration,
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timingParameters: timing)
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animator.addAnimations(animations)
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animator.addCompletion { position in
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completion?(position == .end)
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}
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animator.startAnimation()
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case .slideAndBounce:
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let velocity = CGVector(dx: Constants.springVelocity, dy: Constants.springVelocity)
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let timing = UISpringTimingParameters(dampingRatio: Constants.springDamping,
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initialVelocity: velocity)
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let animator = UIViewPropertyAnimator(duration: Constants.animationDuration,
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timingParameters: timing)
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animator.addAnimations(animations)
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animator.addCompletion { position in
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completion?(position == .end)
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}
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animator.startAnimation()
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}
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}
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}
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