We are creating a watch party app that allows you to video chat with your friends and play a YouTube video at the same time. The video is played using Google's youtube-ios-player-helperlibrary which uses a WKWebView with their iframe API, as that's the only way to play it without violating the Terms of Service. We need the ability to change the volume of the YouTube video separately from the video chat, so you can hear your friends over the video for example.
Unfortunately it's not possible to directly change the volume because iOS does not support changing the volume via JavaScript, unlike macOS. Setting volume doesn't do anything and getting it always returns 1. Users can change the volume with the hardware buttons but this applies to all audio including the video chat, not just the YouTube video.
Someone found a workaround to get the underlying AVPlayer and change its volume natively. This worked with UIWebView but does not work now that it uses WKWebView.
What can be done to change the volume of the YouTube video?
Unfortunately it's not possible to directly change the volume because iOS does not support changing the volume via JavaScript, unlike macOS. Setting volume doesn't do anything and getting it always returns 1. Users can change the volume with the hardware buttons but this applies to all audio including the video chat, not just the YouTube video.
Someone found a workaround to get the underlying AVPlayer and change its volume natively. This worked with UIWebView but does not work now that it uses WKWebView.
What can be done to change the volume of the YouTube video?
