我正在 WatchOS 上构建一个非常简单的锻炼应用程序：它的功能之一是在训练期间提供音频反馈。当显示屏打开时，我可以播放文件，但当显示屏变暗时，手表不会播放我的文件。
有人可以查看我的 swift 代码并帮助我找出我缺少的内容吗？
这是我的扩展Delegate.swift：
var audioPlayer = AVAudioPlayer()
class ExtensionDelegate: NSObject, WKExtensionDelegate {
func applicationDidFinishLaunching() {
let audioSession = AVAudioSession.sharedInstance()
do {
try audioSession.setCategory(AVAudioSessionCategoryAmbient, with: .duckOthers)
} catch {
print("audiosession cannot be set")
}
do { try audioSession.setActive(true) }
catch {
print ("audiosession cannot be activated")
}
let test = URL(fileURLWithPath: Bundle.main.path(forResource: "1", ofType: "m4a")!)
try! audioPlayer = AVAudioPlayer(contentsOf: test)
audioPlayer.prepareToPlay()
audioPlayer.play()
}
func applicationDidBecomeActive() {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
do {
try AVAudioSession.sharedInstance().setActive(true)
} catch {
print ("shared Instance could not be activated")
}
}
func handle(_ backgroundTasks: Set<WKRefreshBackgroundTask>) {
// Sent when the system needs to launch the application in the background to process tasks. Tasks arrive in a set, so loop through and process each one.
for task : WKRefreshBackgroundTask in backgroundTasks {
// Check the Class of each task to decide how to process it
print ("received background tasks")
if task is WKApplicationRefreshBackgroundTask {
// Be sure to complete the background task once you’re done.
let backgroundTask : WKApplicationRefreshBackgroundTask = task as! WKApplicationRefreshBackgroundTask
backgroundTask.setTaskCompleted()
} else if task is WKSnapshotRefreshBackgroundTask {
// Snapshot tasks have a unique completion call, make sure to set your expiration date
let backgroundTask : WKSnapshotRefreshBackgroundTask = task as! WKSnapshotRefreshBackgroundTask
backgroundTask.setTaskCompleted(restoredDefaultState: true, estimatedSnapshotExpiration: .distantFuture, userInfo: nil)
} else if task is WKWatchConnectivityRefreshBackgroundTask {
// Be sure to complete the background task once you’re done.
let backgroundTask : WKWatchConnectivityRefreshBackgroundTask = task as! WKWatchConnectivityRefreshBackgroundTask
backgroundTask.setTaskCompleted()
} else if task is WKURLSessionRefreshBackgroundTask {
// Be sure to complete the background task once you’re done.
let backgroundTask : WKURLSessionRefreshBackgroundTask = task as! WKURLSessionRefreshBackgroundTask
backgroundTask.setTaskCompleted()
} else {
// make sure to complete unhandled task types
task.setTaskCompleted()
}
}
}
}
在 InterfaceController.swift 中我调用该函数：
func startTimer() {
// every 30 seconds
print ("timer function started")
timer = Timer.scheduledTimer(withTimeInterval: 30.0, repeats: true) { [weak self] _ in
print("play")
audioPlayer.play()
}
}
我发现我做错了什么：
为了在屏幕关闭时播放声音，将类别设置为 AVAudioSessionCategoryPlayback 而不是环境非常重要。
这就是我为使其正常工作所做的一切：我更改了扩展 Delegate.swift 第 10 行中的一个单词：
try audioSession.setCategory(AVAudioSessionCategoryPlayback, with: .duckOthers)
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