87 lines
3.1 KiB
Swift
87 lines
3.1 KiB
Swift
//
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// PopupDialogInteractiveTransition.swift
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//
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// Copyright (c) 2016 Orderella Ltd. (http://orderella.co.uk)
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// Author - Martin Wildfeuer (http://www.mwfire.de)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import Foundation
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// Handles interactive transition triggered via pan gesture recognizer on dialog
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final internal class InteractiveTransition: UIPercentDrivenInteractiveTransition {
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// If the interactive transition was started
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var hasStarted = false
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// If the interactive transition
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var shouldFinish = false
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// The view controller containing the views
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// with attached gesture recognizers
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weak var viewController: UIViewController?
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@objc func handlePan(_ sender: UIPanGestureRecognizer) {
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guard let vc = viewController else { return }
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guard let progress = calculateProgress(sender: sender) else { return }
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switch sender.state {
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case .began:
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hasStarted = true
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vc.dismiss(animated: true, completion: nil)
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case .changed:
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shouldFinish = progress > 0.3
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update(progress)
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case .cancelled:
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hasStarted = false
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cancel()
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case .ended:
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hasStarted = false
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completionSpeed = 0.55
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shouldFinish ? finish() : cancel()
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default:
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break
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}
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}
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}
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internal extension InteractiveTransition {
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/*!
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Translates the pan gesture recognizer position to the progress percentage
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- parameter sender: A UIPanGestureRecognizer
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- returns: Progress
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*/
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func calculateProgress(sender: UIPanGestureRecognizer) -> CGFloat? {
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guard let vc = viewController else { return nil }
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// http://www.thorntech.com/2016/02/ios-tutorial-close-modal-dragging/
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let translation = sender.translation(in: vc.view)
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let verticalMovement = translation.y / vc.view.bounds.height
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let downwardMovement = fmaxf(Float(verticalMovement), 0.0)
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let downwardMovementPercent = fminf(downwardMovement, 1.0)
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let progress = CGFloat(downwardMovementPercent)
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return progress
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}
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}
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