如何在iOS中使用应用隐藏式字幕设置代替系统隐藏式字幕设置 [英] How use app closedcaption settings instead of system closed caption settings in ios

问题描述

在我的应用程序中，我具有隐藏字幕设置，并且我正在使用AVPLayer播放视频/实时内容，而没有显示默认控件.在我的应用程序中，我可以基于该开关状态来启用或禁用诸如开关之类的隐藏式字幕，我将BOOL值存储在userdefaults中.根据用户默认设置，我尝试使用以下api为avplayer启用或禁用cc.

In my application i have closed caption settings and i am using AVPLayer to play video/live content without showing default controls. In my app i can able or disable closed captions like switch based on that switch status i am storing BOOL value in userdefaults. Based on userdefaults i am trying to enable or disable cc for avplayer using below api.

[self.player setClosedCaptionDisplayEnabled:enable];

现在的问题是，即使我在应用程序中关闭了cc，但iPhone系统设置cc启用了该功能，我在avplayer中却获得了cc.如果我关闭系统cc，则我的应用设置会在avplayer中生效.

Now problem is Even if i off cc in app but iphone system settings cc enabled that time i am getting cc in avplayer. If i off system cc then my app settings are effecting in avplayer.

请问您有什么办法可以绕过avplayer的系统设置.如果不能，请提供苹果文件链接作为证明我们无法做到这一点的证明.

Can you please suggest is there any way to bypass system settings for avplayer. If cannot can you please provide apple document link to show as a proof to clinet that we cannot do this like that.

推荐答案

您应设置

self.player.appliesMediaSelectionCriteriaAutomatically = FALSE;

与此相反，它已被弃用.

Instead of this, which is deprecated.

[self.player setClosedCaptionDisplayEnabled:enable];

默认情况下，AVPlayer根据系统偏好设置应用选择条件.要覆盖任何媒体选择组的默认条件，请使用-[AVPlayer setMediaSelectionCriteria:forMediaCharacteristic:].

By default, AVPlayer applies selection criteria based on system preferences. To override the default criteria for any media selection group, use -[AVPlayer setMediaSelectionCriteria:forMediaCharacteristic:].

编辑

将使用此方法:

@method setMediaSelectionCriteria:forMediaCharacteristic:

@method setMediaSelectionCriteria:forMediaCharacteristic:

@abstract对具有指定媒体特征的媒体应用自动选择标准.

@abstract Applies automatic selection criteria for media that has the specified media characteristic.

@param标准AVPlayerMediaSelectionCriteria的实例.

@param criteria An instance of AVPlayerMediaSelectionCriteria.

@param media的特性要应用选择标准的媒体特征.支持的值包括AVMediaCharacteristicAudible，AVMediaCharacteristicLegible和AVMediaCharacteristicVisual.

@param mediaCharacteristic The media characteristic for which the selection criteria are to be applied. Supported values include AVMediaCharacteristicAudible, AVMediaCharacteristicLegible, and AVMediaCharacteristicVisual.

@讨论标准将在以下情况下应用于AVPlayerItem:

a)准备播放

b)通过-[AVPlayerItem selectMediaOption:inMediaSelectionGroup:]在另一个组中进行特定的媒体选择.一组中的自动选择可能会受到另一组中特定选择的影响.

b) Specific media selections are made by -[AVPlayerItem selectMediaOption:inMediaSelectionGroup:] in a different group. The automatic choice in one group may be influenced by a specific selection in another group.

c)底层系统偏好设置发生变化，例如系统语言，可访问性字幕.

在任何组中由-[AVPlayerItem selectMediaOption:inMediaSelectionGroup:]进行的特定选择将覆盖该组中的自动选择，直到收到-[AVPlayerItem selectMediaOptionAutomaticallyInMediaSelectionGroup:].

Specific selections made by -[AVPlayerItem selectMediaOption:inMediaSelectionGroup:] within any group will override automatic selection in that group until -[AVPlayerItem selectMediaOptionAutomaticallyInMediaSelectionGroup:] is received.

• (无效)setMediaSelectionCriteria :(可空AVPlayerMediaSelectionCriteria *)条件forMediaCharacteristic:(AVMediaCharacteristic)mediaCharacteristicNS_AVAILABLE(10_9，7_0);

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