Files
ReelShort/ios/Runner/AppDelegate.swift

630 lines
22 KiB
Swift

import Flutter
import UIKit
import AVFoundation
import AVKit
private let thumbnailHTTPHeaderFieldsKey = "AVURLAssetHTTPHeaderFieldsKey"
private final class ThumbnailResponseGate {
private let lock = NSLock()
private var completed = false
func send(_ result: @escaping FlutterResult, data: Data?) {
lock.lock()
if completed {
lock.unlock()
return
}
completed = true
lock.unlock()
DispatchQueue.main.async {
result(data)
}
}
}
/// Keeps the system LaunchScreen as the only splash. Flutter would otherwise
/// instantiate that storyboard again and the icon appears a second time.
final class RunnerFlutterViewController: FlutterViewController {
override func loadDefaultSplashScreenView() -> Bool {
false
}
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .black
}
}
/// iOS 影子播放器:独立 AVPlayer + AVPlayerLayer 专供画中画窗口。
/// Flutter 的 video_player 走纹理渲染,没有 AVPlayerLayer,无法直接创建
/// AVPictureInPictureController;小窗的画面与声音由影子接管,退出时把
/// 影子进度回传给 Dart,由 Flutter 播放器 seek 对齐后继续。
final class PipShadowCoordinator: NSObject, AVPictureInPictureControllerDelegate {
static let shared = PipShadowCoordinator()
private var player: AVPlayer?
private var playerLayer: AVPlayerLayer?
private var controller: AVPictureInPictureController?
private var endObserver: NSObjectProtocol?
private var possibleObservation: NSKeyValueObservation?
/// 画中画还原过渡层:原生窗口级红晕渐变,在系统还原动画开始时立即盖上,
/// 避免回前台瞬间 Flutter 表面未恢复显示黑帧;视频出帧后由 Dart 通知淡出。
private var restoreOverlay: UIView?
/// 系统要求 playerLayer 位于真实的 view 层级中才会判定画中画可用,
/// 因此用 1x1 透明宿主 view 承载,而不是直接挂在 window.layer 上。
private var hostView: UIView?
/// 影子图层就绪稍晚于创建,置位后由 KVO 自动拉起画中画。
private var pendingStart = false
private var startRetryWorkItems: [DispatchWorkItem] = []
weak var channel: FlutterMethodChannel?
/// active 变化回调;停止时把影子最终进度(毫秒)一并提供。
var onPipChanged: ((Bool, Int64) -> Void)?
/// 影子在画中画里播完当前集。
var onPlaybackEnded: (() -> Void)?
static var isSupported: Bool {
AVPictureInPictureController.isPictureInPictureSupported()
}
private var keyWindow: UIWindow? {
UIApplication.shared.connectedScenes
.compactMap { $0 as? UIWindowScene }
.flatMap { $0.windows }
.first { $0.isKeyWindow }
}
/// 首次创建影子:1x1 图层挂在 keyWindow 的宿主 view 里(肉眼不可见),静音待命。
/// [autoEnter] 为 true 时退后台由系统自动拉起画中画(需影子在播,见 armAutoEnter)。
func prepare(urlString: String, positionMs: Int64, autoEnter: Bool) {
teardown()
log("prepare begin supported=\(PipShadowCoordinator.isSupported) autoEnter=\(autoEnter)")
guard Self.isSupported else { return }
guard let url = URL(string: urlString) else {
log("prepare failed bad url \(urlString)")
return
}
guard let window = keyWindow else {
log("prepare failed no key window")
return
}
let item = AVPlayerItem(url: url)
let p = AVPlayer(playerItem: item)
p.isMuted = true
p.actionAtItemEnd = .pause
let layer = AVPlayerLayer()
layer.player = p
let host = UIView(frame: CGRect(x: 0, y: 0, width: 1, height: 1))
host.isUserInteractionEnabled = false
host.backgroundColor = .clear
window.addSubview(host)
layer.frame = host.bounds
host.layer.addSublayer(layer)
hostView = host
guard let c = AVPictureInPictureController(playerLayer: layer) else {
p.pause()
log("prepare failed no pip controller")
return
}
c.canStartPictureInPictureAutomaticallyFromInline = autoEnter
c.delegate = self
player = p
playerLayer = layer
controller = c
// 静音起播让 item 完成首帧解码,isPictureInPicturePossible 才会变 true。
p.play()
possibleObservation = c.observe(
\.isPictureInPicturePossible,
options: [.new, .initial]
) { [weak self] controller, change in
let value = change.newValue ?? controller.isPictureInPicturePossible
self?.log("possible changed to \(value)")
guard let self, self.pendingStart, controller.isPictureInPicturePossible else { return }
self.pendingStart = false
// 刚翻 true 的同一 runloop 里调用会被系统静默拒绝,推到下一拍再进。
DispatchQueue.main.async {
guard self.controller === controller, controller.isPictureInPicturePossible else {
self.log("start via kvo aborted (shadow replaced)")
return
}
self.log("start via kvo")
controller.startPictureInPicture()
}
}
log("shadow ready, seeking to \(positionMs)ms")
if positionMs > 0 {
p.seek(
to: CMTime(value: positionMs, timescale: 1000),
toleranceBefore: .zero,
toleranceAfter: .zero
)
}
registerEndObserver(for: item)
activateAudioSession()
}
/// 退出 App 前(inactive)把影子对齐到当前进度并静音起播:
/// auto PiP 只在「player 正在播放 + 图层离屏」时由系统触发。
func armAutoEnter(positionMs: Int64) {
guard let player, let controller else {
log("arm failed, shadow missing")
return
}
guard controller.canStartPictureInPictureAutomaticallyFromInline else {
log("arm failed, autoEnter disabled on shadow")
return
}
log("arm auto enter at \(positionMs)ms")
if positionMs > 0 {
player.seek(
to: CMTime(value: positionMs, timescale: 1000),
toleranceBefore: CMTime(value: 800, timescale: 1000),
toleranceAfter: CMTime(value: 800, timescale: 1000)
)
}
player.play()
}
/// 回前台后取消待命:影子暂停回静音,等待下一次退后台。
func disarmAutoEnter() {
guard let player else { return }
log("disarm auto enter")
player.pause()
player.isMuted = true
}
/// 进入画中画:图层就绪则立即进入,否则 KVO/延时重试在就绪后自动进入。
/// 仅当影子从未创建成功(prepare 失败)时返回 false。
func start() -> Bool {
guard let controller else {
log("start failed, shadow not created")
return false
}
log("start requested possible=\(controller.isPictureInPicturePossible)")
pendingStart = true
if controller.isPictureInPicturePossible {
pendingStart = false
controller.startPictureInPicture()
}
scheduleStartRetries()
return true
}
/// KVO 偶发不触发或流加载较慢时兜底:就绪后再试两次。
private func scheduleStartRetries() {
startRetryWorkItems.forEach { $0.cancel() }
startRetryWorkItems.removeAll()
for delay in [1.0, 2.5] {
let item = DispatchWorkItem { [weak self] in
guard
let self,
self.pendingStart,
let controller = self.controller,
controller.isPictureInPicturePossible
else { return }
self.log("start via retry after \(delay)s")
self.pendingStart = false
controller.startPictureInPicture()
}
startRetryWorkItems.append(item)
DispatchQueue.main.asyncAfter(deadline: .now() + delay, execute: item)
}
}
/// 画中画内换集:只换 AVPlayerItem,不动 player/layer,窗口不中断。
func replaceItem(urlString: String, positionMs: Int64) {
guard let player, let url = URL(string: urlString) else { return }
let item = AVPlayerItem(url: url)
player.replaceCurrentItem(with: item)
registerEndObserver(for: item)
if positionMs > 0 {
player.seek(
to: CMTime(value: positionMs, timescale: 1000),
toleranceBefore: .zero,
toleranceAfter: .zero
)
}
}
/// 进入画中画后解除静音并起播(此时 Flutter 播放器已被暂停)。
func unmuteAndPlay() {
player?.isMuted = false
player?.play()
}
func positionMs() -> Int64 {
Int64(max(0, player?.currentTime().seconds ?? 0) * 1000)
}
func stopPip() {
controller?.stopPictureInPicture()
}
func teardown() {
startRetryWorkItems.forEach { $0.cancel() }
startRetryWorkItems.removeAll()
possibleObservation?.invalidate()
possibleObservation = nil
pendingStart = false
if let endObserver {
NotificationCenter.default.removeObserver(endObserver)
}
endObserver = nil
player?.pause()
player?.replaceCurrentItem(with: nil)
playerLayer?.removeFromSuperlayer()
playerLayer = nil
hostView?.removeFromSuperview()
hostView = nil
controller?.delegate = nil
controller = nil
player = nil
}
/// 诊断日志:NSLog 之外同步转发到 Dart,便于在 flutter run 控制台观察。
private func log(_ message: String) {
NSLog("pip: %@", message)
channel?.invokeMethod("pipDebug", arguments: message)
}
private func registerEndObserver(for item: AVPlayerItem) {
if let endObserver {
NotificationCenter.default.removeObserver(endObserver)
}
endObserver = NotificationCenter.default.addObserver(
forName: .AVPlayerItemDidPlayToEndTime,
object: item,
queue: .main
) { [weak self] _ in
self?.log("item did play to end")
self?.onPlaybackEnded?()
}
}
/// 画中画的声音走影子播放器,需要 playback 类别的音频会话保活。
private func activateAudioSession() {
do {
try AVAudioSession.sharedInstance().setCategory(.playback, mode: .moviePlayback)
try AVAudioSession.sharedInstance().setActive(true)
} catch {
// 会话激活失败只影响后台出声,不阻断画中画。
}
}
func pictureInPictureControllerWillStartPictureInPicture(
_ pictureInPictureController: AVPictureInPictureController
) {
log("will start")
pendingStart = false
onPipChanged?(true, 0)
}
func pictureInPictureControllerWillStopPictureInPicture(
_ pictureInPictureController: AVPictureInPictureController
) {
log("will stop, showing restore overlay")
showRestoreOverlay()
}
func pictureInPictureControllerDidStopPictureInPicture(
_ pictureInPictureController: AVPictureInPictureController
) {
log("did stop")
showRestoreOverlay()
onPipChanged?(false, positionMs())
}
/// 盖原生过渡层(幂等):主题红晕渐变,不依赖 Flutter 渲染。
func showRestoreOverlay() {
guard let window = keyWindow else { return }
restoreOverlay?.removeFromSuperview()
let overlay = UIView(frame: window.bounds)
overlay.autoresizingMask = [.flexibleWidth, .flexibleHeight]
let gradient = CAGradientLayer()
gradient.frame = overlay.bounds
gradient.colors = [
UIColor(red: 0.298, green: 0.086, blue: 0.102, alpha: 1).cgColor,
UIColor(red: 0.118, green: 0.043, blue: 0.047, alpha: 1).cgColor,
UIColor(red: 0.063, green: 0.063, blue: 0.071, alpha: 1).cgColor,
]
gradient.locations = [0, 0.22, 0.62]
gradient.startPoint = CGPoint(x: 0.5, y: 0)
gradient.endPoint = CGPoint(x: 0.5, y: 1)
overlay.layer.addSublayer(gradient)
window.addSubview(overlay)
restoreOverlay = overlay
}
/// 淡出并移除过渡层(视频首帧已确认后由 Dart 调用)。
func hideRestoreOverlay() {
guard let overlay = restoreOverlay else { return }
restoreOverlay = nil
UIView.animate(
withDuration: 0.25,
animations: { overlay.alpha = 0 }
) { _ in overlay.removeFromSuperview() }
}
}
@main
@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
private let wirelessDataPrompt = WirelessDataPrompt()
private let thumbnailQueue = DispatchQueue(
label: "com.stormg.lumadrama.thumbnail",
qos: .userInitiated
)
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
) -> Bool {
UIApplication.shared.isIdleTimerDisabled = true
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
override func applicationDidBecomeActive(_ application: UIApplication) {
super.applicationDidBecomeActive(application)
requestWirelessDataPrompt()
}
func requestWirelessDataPrompt() {
wirelessDataPrompt.requestSystemPrompt()
}
func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
registerWirelessDataChannel(engineBridge)
registerDeviceIdChannel(engineBridge)
registerPipChannel(engineBridge)
let channel = FlutterMethodChannel(
name: "com.stormg.lumadrama/share",
binaryMessenger: engineBridge.applicationRegistrar.messenger()
)
channel.setMethodCallHandler { [weak self] call, result in
guard call.method == "shareText",
let arguments = call.arguments as? [String: Any],
let text = arguments["text"] as? String,
!text.isEmpty else {
result(FlutterError(code: "share_unavailable", message: "Share sheet is unavailable", details: nil))
return
}
DispatchQueue.main.async {
guard let controller = self?.sharePresenter() else {
result(FlutterError(code: "share_unavailable", message: "Share sheet is unavailable", details: nil))
return
}
let activity = UIActivityViewController(activityItems: [text], applicationActivities: nil)
if let popover = activity.popoverPresentationController {
popover.sourceView = controller.view
popover.sourceRect = CGRect(
x: controller.view.bounds.midX,
y: controller.view.bounds.midY,
width: 0,
height: 0
)
popover.permittedArrowDirections = []
}
activity.completionWithItemsHandler = { _, _, _, _ in result(nil) }
controller.present(activity, animated: true)
}
}
let thumbnailChannel = FlutterMethodChannel(
name: "com.stormg.lumadrama/thumbnail",
binaryMessenger: engineBridge.applicationRegistrar.messenger()
)
thumbnailChannel.setMethodCallHandler { [weak self] call, result in
guard call.method == "frame" else {
result(FlutterMethodNotImplemented)
return
}
guard let self,
let arguments = call.arguments as? [String: Any],
let timeNumber = arguments["timeMs"] as? NSNumber else {
result(nil)
return
}
let localPath = arguments["localPath"] as? String ?? ""
let remoteUrl = arguments["url"] as? String ?? ""
let headers = arguments["headers"] as? [String: String] ?? [:]
let assetUrl: URL?
if !localPath.isEmpty {
assetUrl = localPath.hasPrefix("file:")
? URL(string: localPath)
: URL(fileURLWithPath: localPath)
} else if !remoteUrl.isEmpty {
assetUrl = URL(string: remoteUrl)
} else {
assetUrl = nil
}
guard let assetUrl else {
result(nil)
return
}
let options: [String: Any]? = headers.isEmpty
? nil
: [thumbnailHTTPHeaderFieldsKey: headers]
let asset = AVURLAsset(url: assetUrl, options: options)
let generator = AVAssetImageGenerator(asset: asset)
generator.appliesPreferredTrackTransform = true
generator.maximumSize = CGSize(width: 240, height: 426)
generator.requestedTimeToleranceBefore = CMTime(seconds: 0.5, preferredTimescale: 600)
generator.requestedTimeToleranceAfter = CMTime(seconds: 0.5, preferredTimescale: 600)
let time = CMTime(value: timeNumber.int64Value, timescale: 1000)
let gate = ThumbnailResponseGate()
self.thumbnailQueue.async {
do {
let image = try generator.copyCGImage(at: time, actualTime: nil)
let data = UIImage(cgImage: image).jpegData(compressionQuality: 0.7)
gate.send(result, data: data)
} catch {
gate.send(result, data: nil)
}
}
DispatchQueue.global(qos: .userInitiated).asyncAfter(
deadline: .now() + 1.5
) {
gate.send(result, data: nil)
}
}
}
/// 当前前台 Scene 的根控制器之上,最适合展示系统分享面板的控制器。
private func sharePresenter() -> UIViewController? {
let keyWindow = UIApplication.shared.connectedScenes
.compactMap { $0 as? UIWindowScene }
.first { $0.activationState == .foregroundActive }?
.windows.first { $0.isKeyWindow }
guard let rootController = keyWindow?.rootViewController else { return nil }
let presenter = topPresentedController(from: rootController)
guard presenter.viewIfLoaded?.window != nil else { return nil }
return presenter
}
/// 解析已展示页面、导航栈和标签页中的当前可见控制器。
private func topPresentedController(from controller: UIViewController) -> UIViewController {
if let presented = controller.presentedViewController {
return topPresentedController(from: presented)
}
if let navigation = controller as? UINavigationController,
let visible = navigation.visibleViewController {
return topPresentedController(from: visible)
}
if let tabs = controller as? UITabBarController,
let selected = tabs.selectedViewController {
return topPresentedController(from: selected)
}
return controller
}
/// iOS 画中画:影子播放器通道,与 Android 共用同一 channel 名。
private func registerPipChannel(_ engineBridge: FlutterImplicitEngineBridge) {
let channel = FlutterMethodChannel(
name: "com.stormg.lumadrama/pip",
binaryMessenger: engineBridge.applicationRegistrar.messenger()
)
let pip = PipShadowCoordinator.shared
pip.channel = channel
channel.setMethodCallHandler { call, result in
switch call.method {
case "isAvailable":
result(PipShadowCoordinator.isSupported)
case "enter":
guard let args = call.arguments as? [String: Any],
let url = args["url"] as? String else {
result(false)
return
}
let positionMs = (args["positionMs"] as? NSNumber)?.int64Value ?? 0
pip.prepare(urlString: url, positionMs: positionMs, autoEnter: false)
// 等一拍让 AVPlayerLayer 完成挂载再请求进入画中画。
DispatchQueue.main.async {
result(pip.start())
}
case "prepareShadow":
guard let args = call.arguments as? [String: Any],
let url = args["url"] as? String else {
result(nil)
return
}
pip.prepare(
urlString: url,
positionMs: (args["positionMs"] as? NSNumber)?.int64Value ?? 0,
autoEnter: (args["autoEnter"] as? NSNumber)?.boolValue ?? false
)
result(nil)
case "armAutoEnter":
pip.armAutoEnter(
positionMs: (call.arguments as? [String: Any])?["positionMs"] as? Int64 ?? 0
)
result(nil)
case "showRestoreOverlay":
pip.showRestoreOverlay()
result(nil)
case "hideRestoreOverlay":
pip.hideRestoreOverlay()
result(nil)
case "disarmAutoEnter":
pip.disarmAutoEnter()
result(nil)
case "unmute":
pip.unmuteAndPlay()
result(nil)
case "replaceItem":
guard let args = call.arguments as? [String: Any],
let url = args["url"] as? String else {
result(nil)
return
}
pip.replaceItem(
urlString: url,
positionMs: (args["positionMs"] as? NSNumber)?.int64Value ?? 0
)
result(nil)
case "stop":
pip.stopPip()
result(nil)
case "teardown":
pip.teardown()
result(nil)
default:
result(FlutterMethodNotImplemented)
}
}
pip.onPipChanged = { active, positionMs in
channel.invokeMethod(
"onPipChanged",
arguments: ["active": active, "positionMs": positionMs]
)
}
pip.onPlaybackEnded = {
channel.invokeMethod("onPipPlaybackEnded", arguments: nil)
}
}
/// 设备标识:IDFV 免权限,卸载本 App 不变,避免客户端自生成的 id 每次重装都变。
/// 同通道顺带提供设备区域(ISO-2),注册时作为服务端 IP 解析失败后的兜底。
private func registerDeviceIdChannel(_ engineBridge: FlutterImplicitEngineBridge) {
let channel = FlutterMethodChannel(
name: "com.stormg.lumadrama/device",
binaryMessenger: engineBridge.applicationRegistrar.messenger()
)
channel.setMethodCallHandler { call, result in
switch call.method {
case "idfv":
result(UIDevice.current.identifierForVendor?.uuidString)
case "region":
if #available(iOS 16.0, *) {
result(Locale.current.region?.identifier)
} else {
result(Locale.current.regionCode)
}
default:
result(FlutterMethodNotImplemented)
}
}
}
private func registerWirelessDataChannel(_ engineBridge: FlutterImplicitEngineBridge) {
let channel = FlutterMethodChannel(
name: WirelessDataPrompt.channelName,
binaryMessenger: engineBridge.applicationRegistrar.messenger()
)
channel.setMethodCallHandler { [weak self] call, result in
guard call.method == WirelessDataPrompt.awaitDecisionMethod else {
result(FlutterMethodNotImplemented)
return
}
guard let self else {
result(nil)
return
}
self.wirelessDataPrompt.awaitDecision(result)
}
}
}