问题
I want to get the current Wifi signal strength from an iOS device. A Google search reveals only solutions for Android devices. From the literature I gather that Apple does not allow to access hardware and so nobody can retrieve the device's signal strength in dbm through their app.
Is this correct?
回答1:
As you say, there is no way to do this as Apple doesn't allow apps access to the necessary hardware. (There seems to have been a way to do it in iOS 5 but only using private APIs.)
What you can do - and what, according to this article, some apps are doing - is measure network throughput instead. While that is in no way identical with Wi-Fi signal strength, it may be a reasonable workaround for your application, depending on what it is supposed to do.
Here are some Stack Overflow questions dealing with measuring network throughput:
- Determine the speed on internet programmatically
- Calculating Connection/Download Speed
来源：https://stackoverflow.com/questions/21715690/measuring-signal-strength-from-wifi-to-iphone-ipad