为媒体禁用 iOS Safari 锁定屏幕擦除器

Question

iOS 上的 Safari 在其锁定屏幕上为简单的 HTMLAudioElements 放置了一个洗涤器。例如：

const a = new Audio();
a.src = 'https://example.com/audio.m4a'
a.play();

JSFiddle：https://jsfiddle.net/0seckLfd/

锁定屏幕允许我在当前播放的音频文件中选择一个位置。

如何禁用用户在锁定屏幕上擦除文件的功能？元数据显示 很好，并且能够暂停/播放也是可以接受的，但如果需要，我也可以禁用它。

Answer 1

在锁定屏幕上完全禁用播放器

如果你想完全删除锁屏播放器，你可以这样做

const a = new Audio();
document.querySelector('button').addEventListener('click', (e) => {
  a.src = 'http://sprott.physics.wisc.edu/wop/sounds/Bicycle%20Race-Full.m4a' 
  a.play();
});

document.addEventListener('visibilitychange', () => {
  if (document.hidden) a.src = undefined
})

https://jsfiddle.net/5s8c9eL0/3/

在更改标签或锁定屏幕时停止播放器 （要清理的代码根据您的需要进行改进）

Answer 2

据我了解，除非您可以将音频标记为实时流，否则您无法阻止/隐藏清理命令。话虽如此，您可以使用 js 拒绝清理服务器端。参考答案here。尽管该答案涉及视频，但它也适用于音频。

Answer 3

使用 Web Audio API 也可以避免锁屏/控制中心擦洗器。

这是一个预加载声音并播放的示例，带有注释和错误处理：

try {
    // <audio> element is simpler for sound effects,
    // but in iOS/iPad it shows up in the Control Center, as if it's music you'd want to play/pause/etc.
    // Also, on subsequent plays, it only plays part of the sound.
    // And Web Audio API is better for playing sound effects anyway because it can play a sound overlapping with itself, without maintaining a pool of <audio> elements.
    window.audioContext = window.audioContext || new AudioContext(); // Interoperate with other things using Web Audio API, assuming they use the same global & pattern.
    const audio_buffer_promise =
        fetch("audio/sound.wav")
            .then(response => response.arrayBuffer())
            .then(array_buffer => audioContext.decodeAudioData(array_buffer))
    var play_sound = async function () {
        audioContext.resume(); // in case it was not allowed to start until a user interaction
        // Note that this should be before waiting for the audio buffer,
        // so that it works the first time (it would no longer be "within a user gesture")
        // This only works if play_sound is called during a user gesture (at least once), otherwise audioContext.resume(); needs to be called externally.

        const audio_buffer = await audio_buffer_promise; // Promises can be awaited any number of times. This waits for the fetch the first time, and is instant the next time.
        // Note that if the fetch failed, it will not retry. One could instead rely on HTTP caching and just fetch() each time, but that would be a little less efficient as it would need to decode the audio file each time, so the best option might be custom caching with request error handling.
        const source = audioContext.createBufferSource();
        source.buffer = audio_buffer;
        source.connect(audioContext.destination);
        source.start();
    };
} catch (error) {
    console.log("AudioContext not supported", error);
    play_sound = function() {
        // no-op
        // console.log("SFX disabled because AudioContext setup failed.");
    };
}

Answer 4

我做了一个搜索，想找到一种方法来帮助你，但是我没有找到一个有效的方法来禁用这些命令，但是我找到了一种自定义它们的方法，它可能对你有帮助，关注apple tutorial link

我认为现在剩下要做的就是等待，看看 ios 13 是否会带来一些可以满足您需求的选项。