68 lines
2.5 KiB
Swift
68 lines
2.5 KiB
Swift
//
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// Created by Shin Yamamoto on 2018/10/03.
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// Copyright © 2018 scenee. All rights reserved.
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//
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import UIKit
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public protocol FloatingPanelBehavior {
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// Returns a UIViewPropertyAnimator object in interacting a floating panel by a user pan gesture
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func interactionAnimator(to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator
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// Returns a UIViewPropertyAnimator object to present a floating panel
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func presentAnimator(from: FloatingPanelPosition, to: FloatingPanelPosition) -> UIViewPropertyAnimator
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// Returns a UIViewPropertyAnimator object to dismiss a floating panel
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func dismissAnimator(from: FloatingPanelPosition) -> UIViewPropertyAnimator
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}
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public extension FloatingPanelBehavior {
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func presentAnimator(from: FloatingPanelPosition, to: FloatingPanelPosition) -> UIViewPropertyAnimator {
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return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
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}
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func dismissAnimator(from: FloatingPanelPosition) -> UIViewPropertyAnimator {
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return UIViewPropertyAnimator(duration: 0.25, curve: .easeInOut)
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}
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}
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class FloatingPanelDefaultBehavior: FloatingPanelBehavior {
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func interactionAnimator(to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
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let timing = timeingCurve(to: targetPosition, with: velocity)
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let duration = getDuration(with: velocity)
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return UIViewPropertyAnimator(duration: duration, timingParameters: timing)
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}
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private let velocityThreshold: CGFloat = 8.0
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private func getDuration(with velocity: CGVector) -> TimeInterval {
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let dy = abs(velocity.dy)
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switch dy {
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case ..<1.0:
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return 0.6
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case 1.0..<velocityThreshold:
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let a = ((dy - 1.0) / (velocityThreshold - 1.0))
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return TimeInterval(0.6 - (0.2 * a))
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case velocityThreshold...:
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return 0.4
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default:
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fatalError()
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}
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}
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private func timeingCurve(to: FloatingPanelPosition, with velocity: CGVector) -> UITimingCurveProvider {
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log.debug("velocity", velocity)
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let damping = self.getDamping(with: velocity)
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let springTiming = UISpringTimingParameters(dampingRatio: damping,
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initialVelocity: velocity)
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return springTiming
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}
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private func getDamping(with velocity: CGVector) -> CGFloat {
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let dy = abs(velocity.dy)
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if dy > velocityThreshold {
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return 0.7
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} else {
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return 1.0
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}
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}
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}
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