ReadNFC function in Power Apps
Reads a Near Field Communication (NFC) tag.
Use the ReadNFC function to read an NFC tag that is close to your device. When invoked, the screen displays instructions for scanning an NFC tag, and only returns after the tag has been scanned or a timeout expires.
ReadNFC returns a record of information about the tag that has been read. The record contains:
|RTD||Text||The tag's Record Type Definition (RTD). Only RTD_TEXT and RTD_URI are supported at this time.|
|TNF||Number||The tag's Type Name Format (TNF). Only TNF_WELL_KNOWN is supported at this time.|
|Text||Text||The text payload of the NFC tag if RTD is RTD_TEXT, blank otherwise.|
|URI||Hyperlink||The URI payload of the NFC tag if RTD is RTD_URI, blank otherwise.|
If the tag is not supported, for example, the TNF is not TNF_WELL_KNOWN, or the scan timed out, then the record itself will be blank (and all the columns will be blank too).
Always check the payload value for blank using the IsBlank function before using it. You do not need to check the RTD and TNF values yourself as they must be the correct values for Text and URI to have a non blank value.
Additional RTD and TNF values may be supported in the future. If more values are supported, additional payload columns will also be added. The raw RTD and TNF values are provided for informational purposes and do not need to be consulted if the payload column is checked for blank. More information about these values and their use is available through the NFC Forum and many other books and articles on NFC.
ReadNFC is only supported when running the app in a native mobile player such as the iOS and Andriod players. Even with a supported player, a device may not support NFC, in which case a message will be shown to the user and the function will return a blank record.
ReadNFC can only be used in behavior formulas.
Reads an NFC tag and displays the result. If the result is Text or URI, displays that value to the user. The With function is used to make the columns of the return record easily accessible.
With( ReadNFC(), If( Not IsBlank( Text ), Notify( "Read Text: " & Text ), Not IsBlank( URI ), Notify( "Read URI: " & URI ), Notify( "Didn't read Text or URI" ) ) )
Reads an NFC tag and displays type information about the result.
With( ReadNFC(), Notify( "Tag TNF: " & TNF & ", RTD: " & RTD ) )
Collects read NFC tags for later use.
Collect( ScannedTags, ReadNFC() )
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