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@ -50,6 +50,17 @@ final class SubtitlePipController: NSObject { |
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private(set) var isActive = false |
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/// 小窗上的暂停按钮。 |
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/// |
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/// 语义定成「**冻结当前这条字幕**」而不是「暂停翻译」：用户在别的 App 里 |
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/// 看视频，想把一句话定住多看两眼，这是小窗那个按钮唯一说得通的含义； |
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/// 而且它完全可逆，不会影响正在跑的识别与翻译。 |
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/// 暂停期间新来的文案只暂存，恢复时一次性补上最新的一条。 |
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private var isPaused = false |
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private var pendingLang: String? |
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private var pendingCn: String? |
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private var pendingEn: String? |
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private override init() { |
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super.init() |
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card.setFillsBounds(true) |
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@ -76,7 +87,14 @@ final class SubtitlePipController: NSObject { |
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) |
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let controller = AVPictureInPictureController(contentSource: source) |
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controller.delegate = self |
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// 字幕不是可拖动进度的媒体，去掉播放/快进那套控件 |
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// ⚠️ 这一行就是「不要快进快退按钮」：requiresLinearPlayback 会让系统 |
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// 隐藏小窗上的前进/后退 15 秒，只留播放/暂停。 |
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// |
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// ⚠️ 按钮大小**不可控**。那是系统绘制的小窗 chrome，没有公开接口能改 |
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// 尺寸；它随小窗一起缩放，所以想让按钮小一点，只能把小窗做小 |
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//（捏合手势，或调 widthScale 换个更窄的比例）。 |
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// pip 那个 pub 包用私有 API `_setControlsStyle` 去动控件， |
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// 上架有被拒风险，这里不采用。 |
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controller.requiresLinearPlayback = true |
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// 用户切走 App 时自动进小窗——这正是本功能的使用场景 |
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controller.canStartPictureInPictureAutomaticallyFromInline = true |
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@ -108,6 +126,13 @@ final class SubtitlePipController: NSObject { |
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func update(lang: String?, cn: String?, en: String?) { |
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DispatchQueue.main.async { [weak self] in |
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guard let self = self else { return } |
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if self.isPaused { |
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// 冻结中：只记下最新的一条，恢复时再上屏 |
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if lang != nil { self.pendingLang = lang } |
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if cn != nil { self.pendingCn = cn } |
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if en != nil { self.pendingEn = en } |
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return |
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} |
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self.card.update(withLang: lang, cn: cn, en: en) |
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self.renderAndEnqueue(force: true) |
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} |
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@ -266,7 +291,27 @@ extension SubtitlePipController: AVPictureInPictureControllerDelegate { |
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@available(iOS 15.0, *) |
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extension SubtitlePipController: AVPictureInPictureSampleBufferPlaybackDelegate { |
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func pictureInPictureController(_ pictureInPictureController: AVPictureInPictureController, |
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setPlaying playing: Bool) {} |
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setPlaying playing: Bool) { |
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DispatchQueue.main.async { [weak self] in |
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guard let self = self else { return } |
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self.isPaused = !playing |
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if playing { |
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// 恢复时把冻结期间攒下的最新一条补上 |
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if self.pendingLang != nil || self.pendingCn != nil || self.pendingEn != nil { |
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self.card.update(withLang: self.pendingLang, |
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cn: self.pendingCn, |
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en: self.pendingEn) |
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self.pendingLang = nil |
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self.pendingCn = nil |
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self.pendingEn = nil |
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} |
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self.renderAndEnqueue(force: true) |
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} |
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// ⚠️ 必须通知系统重新问一遍播放状态，否则小窗上那颗按钮的图标 |
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// 不会跟着变——点了「暂停」它还画着暂停图标，看着像没生效。 |
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pictureInPictureController.invalidatePlaybackState() |
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} |
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} |
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/// 返回无限区间 = 告诉系统这是直播流，小窗上就不会出现进度条和快进按钮。 |
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func pictureInPictureControllerTimeRangeForPlayback( |
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@ -276,7 +321,7 @@ extension SubtitlePipController: AVPictureInPictureSampleBufferPlaybackDelegate |
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func pictureInPictureControllerIsPlaybackPaused( |
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_ pictureInPictureController: AVPictureInPictureController) -> Bool { |
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false |
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isPaused |
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} |
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func pictureInPictureController(_ pictureInPictureController: AVPictureInPictureController, |
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Rodger-Wang
1 month ago