来自 URL iOS Swift 的本地通知自定义声音答案

【问题标题】：Local notification custom sound from URL iOS Swift来自 URL iOS Swift 的本地通知自定义声音
【发布时间】：2018-04-11 15:55:41
【问题描述】：

我已经成功录制并播放了本地通知声音的声音，并且在调用该函数时也会播放。

但问题是当我将声音的链接提供给通知声音属性时，它不起作用。

notification.sound = UNNotificationSound.init(named: "martian-gun copy.m4a")

以上代码完美运行。但是当我给它 URL（以字符串的形式）时，它不会播放确切的声音。代码不工作如下：

        let fm = FileManager.default
        let docsurl = try! fm.url(for:.documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
        let myurl = docsurl.appendingPathComponent("sound.m4a")

        notification.sound = UNNotificationSound.init(named: myurl)

myurl 与 playButton 上的语音播放路径相同。最后的问题是如何从声音 URL 设置通知自定义声音？

【问题讨论】：

标签： ios swift usernotifications

【解决方案1】：

根据UNNotificationSound的文档，您需要将您的音频文件的副本放在您应用容器目录的Library/Sounds文件夹中。

let docsurl = try FileManager.default.url(for:.documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
let myurl = docsurl.appendingPathComponent("sound.m4a")


let filename = myurl.lastPathComponent

let targetURL = try FileManager.default.soundsLibraryURL(for: filename)

// copy audio file to /Library/Sounds
if !FileManager.default.fileExists(atPath: targetURL.path) {
    try FileManager.default.copyItem(at: sourceURL, to: targetURL)
}

let content = UNMutableNotificationContent()
content.sound = UNNotificationSound(named: UNNotificationSoundName(filename))


extension FileManager {

    func soundsLibraryURL(for filename: String) throws -> URL {
        let libraryURL = try url(for: .libraryDirectory, in: .userDomainMask, appropriateFor: nil, create: true)
        let soundFolderURL = libraryURL.appendingPathComponent("Sounds", isDirectory: true)
        if !fileExists(atPath: soundFolderURL.path) {
            try createDirectory(at: soundFolderURL, withIntermediateDirectories: true)
        }
        return soundFolderURL.appendingPathComponent(filename, isDirectory: false)
    }
}

【讨论】：