小编sta*_*kor的帖子

我想记录她进入文本字段的历史。我打算用 UserDefaults 注册它。但是，当我尝试使用 UserDefaults 保存它时，“无法将类型为 'nsdate'?' 的值分配给类型 'String'” 错误。我认为它不接受文本字段数据，因为它是字符串。我怎样才能在记忆中保存历史？

formatteddate 和 formatteddate2 给出了这个错误。日期输出如下：20/04/2019 20:23

let token = try? keychain.getString("chipnumbernew")
        chip1InfoString = token

        var time = NSDate()
        var formatter = DateFormatter()
        formatter.dateFormat = "dd/MM/yyyy HH:mm"
        var formatteddate = formatter.string(from: time as Date)
        var formatteddate2 = formatter.string(from: time as Date)

        timertextNew.text = formatteddate
        timertext2New.text = formatteddate2


        let RetrivedDate = UserDefaults.standard.object(forKey: "timertext") as? NSDate

       formatteddate = RetrivedDate

        let RetrivedDate2 = UserDefaults.standard.object(forKey: "timertext2") as? NSDate
        formatteddate2 = RetrivedDate2

I upload the photos I selected from the device to ftp. But despite the photo I have chosen from the device, I get the "no such file directory" error. Although I give the application permissions, it does not save it to IMAGE_DIRECTORY that I have chosen in the application. So I get this error. What is the reason why it did not save the file, even though I gave the permissions?

Error line: f.createNewFile();

error code:

W/System.err: java.io.IOException: No such …