根据 APNS 的文档，APNS 会在设备最后一次连接 APNS 成功后的 30 天后将设备标记为不活跃（inactive）。因此，如果设备在 30 天内与 APNS 成功连接，APNS 就会认为该设备仍然是活跃的（active）。如果设备在 30 天内没有与 APNS 成功连接，则 APNS 会尝试再次连接该设备，如果连接仍然失败，则 APNS 会将该设备标记为不活跃。

以下是一个示例代码，用于检查设备是否被 APNS 标记为不活跃：

let deviceToken = "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef"
guard let apnsExpireDate = apnsExpirationDate(for: deviceToken) else {
    // Device is inactive, handle accordingly
    return
}

let now = Date()
if now > apnsExpireDate {
    // Device is inactive, handle accordingly
} else {
    // Device is still active
}

private func apnsExpirationDate(for deviceToken: String) -> Date? {
    let apnsExpireTimeInterval: TimeInterval = 30 * 24 * 60 * 60 // 30 days in seconds
    let apnsExpireTimeStamp = UInt32(Date().timeIntervalSince1970 - apnsExpireTimeInterval)
    let apnsExpireByteValue = withUnsafeBytes(of: apnsExpireTimeStamp) { Data($0) }.suffix(4)
    let deviceTokenData = Data(hexEncoded: deviceToken)
    var apnsDeviceToken = Data(repeating: 0, count: 32)
    apnsDeviceToken.append(deviceTokenData)
    apnsDeviceToken.append(apnsExpireByteValue)
    return Date(timeIntervalSince1970: TimeInterval(bigEndian: apnsExpireTimeStamp))
}

extension Data {
    init?(hexEncoded string: S) {
        guard let regex = try? NSRegularExpression(pattern: "^[0-9a-f]{2}$", options: .caseInsensitive) else {
            return nil
        }
        guard regex.matches(in: String(string), options: [], range: NSRange(location: 0, length: string.utf16.count)).count == string.utf16.count / 2 else {
            return nil
        }
        self.init(capacity: string.utf16.count / 2)
        var iterator = string.utf16.makeIterator()
        while let high = iterator.next(), let low = iterator.next() {