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| 1 | +/* |
| 2 | + Copyright 2017-present The Material Motion Authors. All Rights Reserved. |
| 3 | + |
| 4 | + Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + you may not use this file except in compliance with the License. |
| 6 | + You may obtain a copy of the License at |
| 7 | + |
| 8 | + http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + |
| 10 | + Unless required by applicable law or agreed to in writing, software |
| 11 | + distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + See the License for the specific language governing permissions and |
| 14 | + limitations under the License. |
| 15 | + */ |
| 16 | + |
| 17 | +import UIKit |
| 18 | +import Transitioning |
| 19 | + |
| 20 | +class MenuExampleViewController: ExampleViewController { |
| 21 | + |
| 22 | + func didTap() { |
| 23 | + let modalViewController = ModalViewController() |
| 24 | + modalViewController.transitionController.transition = MenuTransition() |
| 25 | + present(modalViewController, animated: true) |
| 26 | + } |
| 27 | + |
| 28 | + override func viewDidLoad() { |
| 29 | + super.viewDidLoad() |
| 30 | + |
| 31 | + let label = UILabel(frame: view.bounds) |
| 32 | + label.autoresizingMask = [.flexibleWidth, .flexibleHeight] |
| 33 | + label.textColor = .white |
| 34 | + label.textAlignment = .center |
| 35 | + label.text = "Tap to start the transition" |
| 36 | + view.addSubview(label) |
| 37 | + |
| 38 | + let tap = UITapGestureRecognizer(target: self, action: #selector(didTap)) |
| 39 | + view.addGestureRecognizer(tap) |
| 40 | + } |
| 41 | + |
| 42 | + override func exampleInformation() -> ExampleInfo { |
| 43 | + return .init(title: type(of: self).catalogBreadcrumbs().last!, |
| 44 | + instructions: "Tap to present a modal transition.") |
| 45 | + } |
| 46 | +} |
| 47 | + |
| 48 | +private final class MenuTransition: NSObject, TransitionWithPresentation { |
| 49 | + func presentationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController?) -> UIPresentationController? { |
| 50 | + return nil |
| 51 | + } |
| 52 | + |
| 53 | + func defaultModalPresentationStyle() -> UIModalPresentationStyle { |
| 54 | + return .overCurrentContext |
| 55 | + } |
| 56 | + |
| 57 | + func start(with context: TransitionContext) { |
| 58 | + let foreView = context.foreViewController.view! |
| 59 | + if(context.direction == .forward) { |
| 60 | + foreView.frame.origin.x = -1 * foreView.frame.width |
| 61 | + UIView.animate( |
| 62 | + withDuration: context.duration, |
| 63 | + animations: { |
| 64 | + foreView.frame.origin.x = -1 * (foreView.frame.width / 2) |
| 65 | + }, |
| 66 | + completion: { _ in |
| 67 | + context.transitionDidEnd() |
| 68 | + } |
| 69 | + ) |
| 70 | + } else { |
| 71 | + UIView.animate( |
| 72 | + withDuration: context.duration, |
| 73 | + animations: { |
| 74 | + foreView.frame.origin.x = -1 * foreView.frame.width |
| 75 | + }, |
| 76 | + completion: { _ in |
| 77 | + context.transitionDidEnd() |
| 78 | + } |
| 79 | + ) |
| 80 | + } |
| 81 | + } |
| 82 | +} |
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