Hi ✋ I'm trying to build an app with SwiftUI, and I'm completely new to coding. I want to use iPhone's proximity sensor as a feature in my app.
This is not what I actually want, but to make it simple:
Say there is a number shown on the screen. Whenever I cover the iPhone's proximity sensor with my hand, the number is increased by one. theNumber += 1
import SwiftUI
struct ContentView: View {
@State private var theNumber: Int = 0
var body: some View {
Text("\(theNumber)")
}
}
You can retrieve the proximityState value from the current UIDevice and detect when it changes. You need to enable proximity monitoring first and I suggest doing that in your main App struct.
// in main App struct
init() {
UIDevice.current.isProximityMonitoringEnabled = true
}
struct ContentView: View {
@State private var theNumber = 0
var body: some View {
Text("\(theNumber)")
.onReceive(NotificationCenter.default.publisher(for: UIDevice.proximityStateDidChangeNotification)) { _ in
if UIDevice.current.proximityState {
// sensor is close to user
// true is "near", false is "far"
theNumber += 1
}
}
}
}
Things to Note
- The sensor detects objects up to 10 cm away.
- When the sensor detects an object that is close, the screen turns off.
- There is no single point where the proximity state switches between "near" and "far", but instead a buffer range.
- When the state is "far", the object must be up to 5 cm from the sensor in order to change the state to "near".
- When the state is "near", the object must be at least 10 cm from the sensor in order to change the state to "far".
