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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| Copyright 2017-present The Material Motion Authors. All Rights Reserved. | ||
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| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| import UIKit | ||
| import MotionTransitioning | ||
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| // This example demonstrates how to build a custom UINavigationController transition using the | ||
| // Motion Transitioning APIs in Swift. The essential steps have been documented below. | ||
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| class NavControllerFadeExampleViewController: ExampleViewController { | ||
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| func didTap() { | ||
| let modalViewController = ModalViewController() | ||
| modalViewController.title = "Example view controller" | ||
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| // The transition controller is an associated object on all UIViewController instances that | ||
| // allows you to customize the way the view controller is presented. The primary API on the | ||
| // controller that you'll make use of is the `transition` property. Setting this property will | ||
| // dictate how the view controller is presented. For this example we've built a custom | ||
| // FadeTransition, so we'll make use of that now: | ||
| modalViewController.transitionController.transition = FadeTransition() | ||
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| cachedNavDelegate = navigationController?.delegate | ||
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| // In order to customize navigation controller transitions you must implement the necessary | ||
| // delegate methods. By setting the shared transition navigation controller delegate instance | ||
| // we're able to customize push/pop transitions using our transitionController. | ||
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| navigationController?.delegate = TransitionNavigationControllerDelegate.sharedDelegate() | ||
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| navigationController?.pushViewController(modalViewController, animated: true) | ||
| } | ||
| private var cachedNavDelegate: UINavigationControllerDelegate? | ||
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| override func viewDidDisappear(_ animated: Bool) { | ||
| super.viewDidDisappear(animated) | ||
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| if parent == nil { // Popped off | ||
| // Restore the previous delegate, if any. | ||
| navigationController?.delegate = cachedNavDelegate | ||
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| cachedNavDelegate = nil | ||
| } | ||
| } | ||
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| override func viewDidLoad() { | ||
| super.viewDidLoad() | ||
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| let label = UILabel(frame: view.bounds) | ||
| label.autoresizingMask = [.flexibleWidth, .flexibleHeight] | ||
| label.textColor = .white | ||
| label.textAlignment = .center | ||
| label.text = "Tap to start the transition" | ||
| view.addSubview(label) | ||
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| let tap = UITapGestureRecognizer(target: self, action: #selector(didTap)) | ||
| view.addGestureRecognizer(tap) | ||
| } | ||
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| override func exampleInformation() -> ExampleInfo { | ||
| return .init(title: type(of: self).catalogBreadcrumbs().last!, | ||
| instructions: "Tap to present a modal transition.") | ||
| } | ||
| } | ||
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| // Transitions must be NSObject types that conform to the Transition protocol. | ||
| private final class FadeTransition: NSObject, Transition { | ||
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| // The sole method we're expected to implement, start is invoked each time the view controller is | ||
| // presented or dismissed. | ||
| func start(with context: TransitionContext) { | ||
| CATransaction.begin() | ||
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| CATransaction.setCompletionBlock { | ||
| // Let UIKit know that the transition has come to an end. | ||
| context.transitionDidEnd() | ||
| } | ||
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| let fade = CABasicAnimation(keyPath: "opacity") | ||
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| fade.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut) | ||
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| // Define our animation assuming that we're going forward (presenting)... | ||
| fade.fromValue = 0 | ||
| fade.toValue = 1 | ||
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| // ...and reverse it if we're going backwards (dismissing). | ||
| if context.direction == .backward { | ||
| let swap = fade.fromValue | ||
| fade.fromValue = fade.toValue | ||
| fade.toValue = swap | ||
| } | ||
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| // Add the animation... | ||
| context.foreViewController.view.layer.add(fade, forKey: fade.keyPath) | ||
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| // ...and ensure that our model layer reflects the final value. | ||
| context.foreViewController.view.layer.setValue(fade.toValue, forKeyPath: fade.keyPath!) | ||
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| CATransaction.commit() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| Copyright 2017-present The Material Motion Authors. All Rights Reserved. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| #import <UIKit/UIKit.h> | ||
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| /** | ||
| This class provides a singleton implementation of UINavigationControllerDelegate that makes it | ||
| possible to configure view controller transitions using each view controller's transition | ||
| controller. | ||
| This class is not meant to be instantiated directly. | ||
| The +delegate should be assigned as the delegate for any UINavigationController instance that | ||
| wishes to configure transitions using the mdm_transitionController (transitionController in Swift) | ||
| property on a view controller. | ||
| If a navigation controller already has its own delegate, then that delegate can simply forward | ||
| the two necessary methods to the +sharedInstance of this class. | ||
| */ | ||
| NS_SWIFT_NAME(TransitionNavigationControllerDelegate) | ||
| @interface MDMTransitionNavigationControllerDelegate : NSObject | ||
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| /** | ||
| Use when directly invoking methods. | ||
| Only supported methods are exposed. | ||
| */ | ||
| + (instancetype)sharedInstance; | ||
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| /** | ||
| Can be set as a navigation controller's delegate. | ||
| */ | ||
| + (id<UINavigationControllerDelegate>)sharedDelegate; | ||
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| #pragma mark <UINavigationControllerDelegate> Support | ||
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| - (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController | ||
| animationControllerForOperation:(UINavigationControllerOperation)operation | ||
| fromViewController:(UIViewController *)fromVC | ||
| toViewController:(UIViewController *)toVC; | ||
| - (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController | ||
| interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController; | ||
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| @end |
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