29 lines
1.7 KiB
Markdown
29 lines
1.7 KiB
Markdown
# FAQ
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## [iOS] cannot write NDEF into NFC tags
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iOS won't allow writing NDEF into un-formatted tags, so you should first format your tags. For type 2 tags (most NTAG2xx), you can use an app like NFC Tools or NXP Tag Writer to do perform formatting.
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> It's possible to implement the NDEF formatting ourself through this library, here's an [example](https://github.com/revtel/react-native-nfc-rewriter/tree/naive-ndef-format). However, it's actually an naive approach, since we don't handle the case if the tag is already formatted and we provide no extra lock / memory information before NDEF TLV, so use this code snippet with cautions.
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## [iOS] cannot read NDEF from NFC tags
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The same as above, please check if the tag is properly formatted, and contain at least 1 NdefMessage
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* This NdefMessage can contain only one NdefRecord as [TNF_EMPTY](https://developer.android.com/reference/android/nfc/NdefRecord#TNF_EMPTY)
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## [iOS] cannot read / write Mifare Classic
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Indeed, currently MifareClassic isn't supported by Core NFC in our tests. It is also not listed in Core NFC's [NFCMiFareFamily](https://developer.apple.com/documentation/corenfc/nfcmifarefamily?language=objc)
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## [Android] My NFC tag cannot launch my app
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Note on getLaunchTagEvent: keep in mind that you can only create intent-filters for the very first NDEF record on an NFC tag! If your intent-filter doesn't match the FIRST record your app will launch but it won't get the tag data. Check out for details:
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https://stackoverflow.com/questions/25504418/get-nfc-tag-with-ndef-android-application-record-aar/25510642
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Also you should add
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```xml
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android:launchMode="singleTask"
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```
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to your manifest to prevent launching your app as another task when it is already running.
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