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164 lines
5.4 KiB
164 lines
5.4 KiB
// The MIT License (MIT)
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//
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// Copyright (c) 2016 Luke Zhao <me@lkzhao.com>
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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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import UIKit
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extension HeroTransition {
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open func start() {
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guard state == .notified else { return }
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state = .starting
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if let toView = toView, let fromView = fromView {
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if let toViewController = toViewController, let transitionContext = transitionContext {
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toView.frame = transitionContext.finalFrame(for: toViewController)
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} else {
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toView.frame = fromView.frame
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}
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toView.setNeedsLayout()
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toView.layoutIfNeeded()
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}
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if let fvc = fromViewController, let tvc = toViewController {
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closureProcessForHeroDelegate(vc: fvc) {
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$0.heroWillStartTransition?()
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$0.heroWillStartAnimatingTo?(viewController: tvc)
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}
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closureProcessForHeroDelegate(vc: tvc) {
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$0.heroWillStartTransition?()
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$0.heroWillStartAnimatingFrom?(viewController: fvc)
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}
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}
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// take a snapshot to hide all the flashing that might happen
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fullScreenSnapshot = transitionContainer?.window?.snapshotView(afterScreenUpdates: false) ?? fromView?.snapshotView(afterScreenUpdates: false)
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if let fullScreenSnapshot = fullScreenSnapshot {
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(transitionContainer?.window ?? transitionContainer)?.addSubview(fullScreenSnapshot)
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}
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if let oldSnapshot = fromViewController?.hero.storedSnapshot {
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oldSnapshot.removeFromSuperview()
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fromViewController?.hero.storedSnapshot = nil
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}
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if let oldSnapshot = toViewController?.hero.storedSnapshot {
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oldSnapshot.removeFromSuperview()
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toViewController?.hero.storedSnapshot = nil
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}
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plugins = HeroTransition.enabledPlugins.map({ return $0.init() })
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processors = [
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IgnoreSubviewModifiersPreprocessor(),
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ConditionalPreprocessor(),
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DefaultAnimationPreprocessor(),
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MatchPreprocessor(),
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SourcePreprocessor(),
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CascadePreprocessor()
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]
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animators = [
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HeroDefaultAnimator<HeroCoreAnimationViewContext>()
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]
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if #available(iOS 10, tvOS 10, *) {
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animators.append(HeroDefaultAnimator<HeroViewPropertyViewContext>())
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}
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// There is no covariant in Swift, so we need to add plugins one by one.
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for plugin in plugins {
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processors.append(plugin)
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animators.append(plugin)
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}
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transitionContainer?.isUserInteractionEnabled = isUserInteractionEnabled
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// a view to hold all the animating views
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container = UIView(frame: transitionContainer?.bounds ?? .zero)
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if !toOverFullScreen && !fromOverFullScreen {
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container.backgroundColor = containerColor
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}
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transitionContainer?.addSubview(container)
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context = HeroContext(container: container)
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for processor in processors {
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processor.hero = self
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}
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for animator in animators {
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animator.hero = self
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}
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if let toView = toView, let fromView = fromView {
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context.loadViewAlpha(rootView: toView)
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context.loadViewAlpha(rootView: fromView)
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container.addSubview(toView)
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container.addSubview(fromView)
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toView.updateConstraints()
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toView.setNeedsLayout()
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toView.layoutIfNeeded()
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context.set(fromViews: fromView.flattenedViewHierarchy, toViews: toView.flattenedViewHierarchy)
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}
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if (viewOrderingStrategy == .auto && !isPresenting && !inTabBarController) ||
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viewOrderingStrategy == .sourceViewOnTop {
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context.insertToViewFirst = true
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}
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for processor in processors {
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processor.process(fromViews: context.fromViews, toViews: context.toViews)
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}
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animatingFromViews = context.fromViews.filter { (view: UIView) -> Bool in
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for animator in animators {
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if animator.canAnimate(view: view, appearing: false) {
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return true
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}
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}
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return false
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}
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animatingToViews = context.toViews.filter { (view: UIView) -> Bool in
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for animator in animators {
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if animator.canAnimate(view: view, appearing: true) {
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return true
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}
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}
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return false
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}
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if let toView = toView {
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context.hide(view: toView)
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}
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#if os(tvOS)
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animate()
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#else
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if inNavigationController {
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// When animating within navigationController, we have to dispatch later into the main queue.
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// otherwise snapshots will be pure white. Possibly a bug with UIKit
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DispatchQueue.main.async {
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self.animate()
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}
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} else {
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animate()
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}
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#endif
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}
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}
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