swiftデバイスストレージ、読み取り

//nsdata class func savejson(dic:NSData){let filePath=NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.libraryDirectory,FileManager.SearchPathDomainMask.userDomainMask,true);let libr=filePath[0]+"loging"var bol=Bool=bol=dic.write(toFile:libr,atomically:true:true:true:true:true//異なるタイプのストレージには異なるメソッドif bol{print("ストレージ成功")}else{print("ストレージ失敗")があります. } }
//class func readloginData(){

    do{
        let filePath = NSSearchPathForDirectoriesInDomains(FileManager.SearchPathDirectory.libraryDirectory, FileManager.SearchPathDomainMask.userDomainMask, true);
        let libr = filePath[0]+"loging"
        let fileManager = FileManager.default
        let exist = fileManager.fileExists(atPath: libr)
        if exist{
            let  content = fileManager.contents(atPath: libr)
            
            let dat:Data = (content)!
            let dict = String(data: dat, encoding: String.Encoding.utf8)
            let jsonData = dict?.data(using: String.Encoding.utf8, allowLossyConversion: false) ?? Data()
            guard let json = try? JSONSerialization.jsonObject(with: jsonData, options: .mutableContainers)else{
                return
            }
            
            print(json)
        }
    }
}