get wifi signalstrength

I want to get wifi signalstrength.

iOS has no general-purpose Wi-Fi signal strength API. See TN3111 iOS Wi-Fi API Overview for more background on this.

But I can't get Nehotspothelper.

The above-mentioned technote says:

There are both technical and business restrictions that prevent it from being used for other tasks

You’ve encountered the business reason, but there are technical reasons as well.

Why do you need the Wi-Fi signal strength? What do you plan to do with this value?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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