I've seen the question asked but not answered to anyone's satisfaction. My app makes many network calls. I'd like to check signal strength and if it falls below a threshold, alert the user that the app won't function at that level.
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Possible duplicate of [Measuring cellular signal strength](https://stackoverflow.com/questions/4954389/measuring-cellular-signal-strength) – dirtydanee Jul 16 '17 at 10:06
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As per the duplicate....."I am pretty confident that some of the used calls are undocumented in the CoreTelephony framework documentation from Apple and therefore private - any app in the AppStore must have slipped passed inspection." – Martin Muldoon Jul 16 '17 at 10:09
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The answer suggests screen scraping the status bar... but also makes clear: If the status bar is hidden, the key "statusBar" will return nil. In my case the status bar will be hidden. – Martin Muldoon Jul 16 '17 at 10:20