待研究 ，信号量

///判断网络是否有权限 private func isNetworkPermissions() -> Bool { var isNetworkPermissions:Bool = false let cellularData = CTCellularData() ///线程信号量 let semaphore = DispatchSemaphore(value: 0)

    cellularData.cellularDataRestrictionDidUpdateNotifier = { state in
        if state == .notRestricted {
            isNetworkPermissions = true
            
        } else  {
            isNetworkPermissions = false
        }
        
        semaphore.signal()
    }
    
    semaphore.wait()
    return isNetworkPermissions
}

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