尝试使用 iPhone 7 Plus 读取 NFC 标签时出现此错误
2017-12-13 14:03:01.522137-0300 nfc[279:9534] [general] 连接到名为 com.apple.nfcd.service.corenfc 的服务:在解码收到的消息时捕获异常,丢弃传入的消息。
异常:解码参数 0 时出现异常(调用#2):
例外:decodeObjectForKey:类“NFTechnologyEvent”未加载或不存在
我有适当的权利 ( Near Field Communication Tag Reading
) 并已Privacy - NFC Scan Usage Description
设置。
要重现它,只需启动一个新的单视图项目并将默认值替换为ViewController
:
import UIKit
import CoreNFC
class ViewController: UIViewController, NFCNDEFReaderSessionDelegate {
// Reference the NFC session
private var nfcSession: NFCNDEFReaderSession!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.startScanning()
}
func startScanning() {
// Create the NFC Reader Session when the app starts
self.nfcSession = NFCNDEFReaderSession(delegate: self, queue: nil, invalidateAfterFirstRead: false)
// A custom description that helps users understand how they can use NFC reader mode in your app.
self.nfcSession?.alertMessage = "Macri Gato"
self.nfcSession?.begin()
}
// Called when the reader-session expired, you invalidated the dialog or accessed an invalidated session
public func readerSession(_ session: NFCNDEFReaderSession, didInvalidateWithError error: Error) {
print("NFC-Session invalidated: \(error.localizedDescription)")
print("==========================")
self.startScanning()
}
// Called when a new set of NDEF messages is found
public func readerSession(_ session: NFCNDEFReaderSession, didDetectNDEFs messages: [NFCNDEFMessage]) {
print("New NFC Messages (\(messages.count)) detected:")
print(messages)
}
}