问题
I am looking for ways to get the raw signal of the wifi, the dBm on iPhone X phones, but can only find how to get the numberOfActiveBars from: Answer
Trying @Mosbash answer, getting a crash.
Thread 1: EXC_BAD_ACCESS (code=1, address=0x18) Code:
class ViewController: UIViewController {
var hotspot: NEHotspotNetwork!
func viewDidLoad() {
....
hotspot = NEHotspotNetwork()
}
func record() {
hotspot.setConfidence(.high) /// <- Crash
print(hotspot.signalStrength) /// <- Crash if above line is commented out
}
}
回答1:
You can use signalStrength from NEHotspotNetwork as described here https://developer.apple.com/documentation/networkextension/nehotspotnetwork/1618923-signalstrength
When the Hotspot Helper app is asked to evaluate the a network or filter the Wi-Fi scan list, it annotates the NEHotspotNetwork object via the setConfidence: method.
Here is the formula to convert Wifi Signal Strength Percentage to RSSI dBm:
quality = 2 * (dBm + 100) where dBm: [-100 to -50]
dBm = (quality / 2) - 100 where quality: [0 to 100]
See this answer for more details: How to convert Wifi signal strength from Quality (percent) to RSSI (dBm)?
来源：https://stackoverflow.com/questions/54172387/how-to-measure-wifi-dbm-strength-on-iphone-x-ios-swift