迅速:NFCError Code ＝ 202“会话意外地无效". [英] Swift: NFCError Code=202 "Session is invalidated unexpectedly"

问题描述

我正在尝试使用NFC.我遵循了这些步骤:

I'm trying to use NFC. I followed those steps:

• 在AppID配置中启用了NFC

• Enabled NFC in the AppID configuration

创建了配置文件并安装了它

Created a provisioning profile and installed it

为目标添加了NFC功能

Added NFC capability to the target

在plist文件中添加了隐私说明

Added the privacy description in the plist file

此后，我导入了CoreNFC并实现了这些代码:

After this I imported CoreNFC and implemented those code:

@available(iOS 11.0, *)    
    extension EventPreviewViewController: NFCNDEFReaderSessionDelegate {
            func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
                let alert = UIAlertController.withOkButton(andTitle: NSLocalizedString("TitleWarning"), andText: NSLocalizedString("ErrorNFCInvalidate"), okHandler: nil)
                self.present(alert, animated: true, completion: nil)
            }

            func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
                // TODO
            }
        }


class EventPreviewViewController: UITableViewController {
@available(iOS 11.0, *)
var nfcSession: NFCNDEFReaderSession {
        return NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: true)
    }

    @IBAction func startAccess(_ sender: UIButton) {
    if #available(iOS 11.0, *) {
                    nfcSession.begin()
                } else {
                    let alert = UIAlertController.withOkButton(andTitle: NSLocalizedString("TitleWarning"), andText: NSLocalizedString("ErrorNFCUnsupported"), okHandler: nil)
                    self.present(alert, animated: true, completion: nil)
                }
    }
}

为什么我不断收到错误域= NFC错误代码= 202会话意外失效" UserInfo = {NSLocalizedDescription =会话意外失效}"?

Why I keep getting "Error Domain=NFCError Code=202 "Session is invalidated unexpectedly" UserInfo={NSLocalizedDescription=Session is invalidated unexpectedly}"?

推荐答案

针对ios13/swift 5.1的更新

update for ios13 / swift 5.1

a)苹果公司的原始样本有时会失败，并导致相同的错误.

a) original sample from Apple does sometimes fails the same error.

( https://developer.apple.com/documentation/corenfc/building_an_nfc_tag- reader_app )

b)如果失败(似乎是愚蠢的.无论如何..都可以工作.)重新启动设备.它发生了;(

b) if fails (seems a be stupid.. anyway.. works..) reboot device. It happens ;(

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