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我在运行 Xcode Beta 13、Series 6 Watch 和 Watch OS 8 beta 的控制台中收到此错误。它似乎与新的 AlwaysOnSession API 有关？我的应用程序是一个锻炼应用程序，它启动HKWorkout并收集心率数据等。这个问题似乎也阻止了我的应用程序在手表上接收 HR 样本，尽管它不在模拟器中。知道可能是什么原因，还是只是 Watch OS 8 beta 错误。

  2021-07-25 15:02:48.765262-0400 newFitnessApp WatchKit Extension[507:473776] [scenes] 0x15d7f590 unexpectedly nil frameSpecifier. presentationDate:15:02:48.559 alwaysOnSession:<BLSAlwaysOnSession: 0x15dc64a0; model: <BLSFrameSpecifierModel: 0x172f26e0; count: 1; first: <BLSAlwaysOnFrameSpecifier: 0x17545250; presentation interval: "15:02:48.711 07/25 (in 0 sec) : 0.016s duration"> = {
    15:02:48.711,1.00% (null)*;
}; last: <BLSAlwaysOnFrameSpecifier: 0x17545250; presentation interval: "15:02:48.711 07/25 (in 0 sec) : 0.016s duration"> = {
    15:02:48.711,1.00% (null)*;
}>; environment: <0x15eca750:myndarc.newFitnessApp.watchkitapp>>
2021-07-25 15:02:58.681115-0400 newFitnessApp WatchKit Extension[507:473776] [scenes] 0x15d7f590 unexpectedly nil frameSpecifier. presentationDate:15:02:58.643 alwaysOnSession:<BLSAlwaysOnSession: 0x15efc790; model: <BLSFrameSpecifierModel: 0x15e07be0; count: 0; first: 0x0; last: 0x0>; environment: <0x15eca750:myndarc.newFitnessApp.watchkitapp>>
2021-07-25 15:02:58.701913-0400 newFitnessApp WatchKit Extension[507:473776] [scenes] 0x15d7f590 unexpectedly nil frameSpecifier. presentationDate:15:02:58.643 alwaysOnSession:<BLSAlwaysOnSession: 0x15efc790; model: <BLSFrameSpecifierModel: 0x15e07be0; count: 0; first: 0x0; last: 0x0>; environment: <0x15eca750:myndarc.newFitnessApp.watchkitapp>>
2021-07-25 15:03:03.558903-0400 newFitnessApp WatchKit Extension[507:473776] [scenes] 0x15d7f590 unexpectedly nil frameSpecifier. presentationDate:15:03:03.438 alwaysOnSession:<BLSAlwaysOnSession: 0x15efc790; model: <BLSFrameSpecifierModel: 0x17566ca0; count: 1; first: <BLSAlwaysOnFrameSpecifier: 0x1754f180; presentation interval: "15:03:03.514 07/25 (in 0 sec) : 0.016s duration"> = {
    15:03:03.514,1.00% (null)*;
}; last: <BLSAlwaysOnFrameSpecifier: 0x1754f180; presentation interval: "15:03:03.514 07/25 (in 0 sec) : 0.016s duration"> = {
    15:03:03.514,1.00% (null)*;
}>; environment: <0x15eca750:myndarc.newFitnessApp.watchkitapp>>
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