Since the built-in values are unreliable, I made my own static class to define them correctly. I'm still using 2018.4.22f1, so it's understandable that some devices aren't defined, but they can easily be added for newer versions of Unity for anyone that wants to know they're getting the correct values.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.iOS;
/*
Since Unity's built-in Screen.dpi returns inaccurate values for some iOS devices, I made my own enumeration for all devices known to Unity at this point.
*/
public static class iOSDPI
{
public static int dpi
{
get
{
switch (Device.generation)
{
case DeviceGeneration.iPad1Gen:
case DeviceGeneration.iPad2Gen:
return 132;
case DeviceGeneration.iPhone:
case DeviceGeneration.iPhone3G:
case DeviceGeneration.iPhone3GS:
return 163;
case DeviceGeneration.iPad3Gen:
case DeviceGeneration.iPad4Gen:
case DeviceGeneration.iPad5Gen:
case DeviceGeneration.iPad6Gen:
case DeviceGeneration.iPad7Gen:
case DeviceGeneration.iPadAir1:
case DeviceGeneration.iPadAir2:
case DeviceGeneration.iPadPro10Inch1Gen:
case DeviceGeneration.iPadPro10Inch2Gen:
case DeviceGeneration.iPadPro11Inch:
case DeviceGeneration.iPadPro1Gen:
case DeviceGeneration.iPadPro2Gen:
case DeviceGeneration.iPadPro3Gen:
case DeviceGeneration.iPadUnknown:
return 264;
case DeviceGeneration.iPhone4:
case DeviceGeneration.iPhone4S:
case DeviceGeneration.iPhone5:
case DeviceGeneration.iPhone5C:
case DeviceGeneration.iPhone5S:
case DeviceGeneration.iPhone6:
case DeviceGeneration.iPhone6Plus:
case DeviceGeneration.iPhone6S:
case DeviceGeneration.iPhone7:
case DeviceGeneration.iPhone8:
case DeviceGeneration.iPhoneSE1Gen:
case DeviceGeneration.iPhoneXR:
case DeviceGeneration.iPadMini1Gen:
case DeviceGeneration.iPadMini2Gen:
case DeviceGeneration.iPadMini3Gen:
case DeviceGeneration.iPadMini4Gen:
//case DeviceGeneration.iPadMini5Gen: // This enum not defined in Unity 2018.4.22f1
return 326;
case DeviceGeneration.iPhone6SPlus:
case DeviceGeneration.iPhone7Plus:
case DeviceGeneration.iPhone8Plus:
return 401;
case DeviceGeneration.iPhoneX:
case DeviceGeneration.iPhoneXS:
case DeviceGeneration.iPhoneXSMax:
case DeviceGeneration.iPhone11:
case DeviceGeneration.iPhone11Pro:
case DeviceGeneration.iPhone11ProMax:
return 458;
// These enums not defined in Unity 2018.4.22f1
// case DeviceGeneration.iPhone12
// return 460;
// case DeviceGeneration.iPhone12Mini
// return 476;
default:
return 460;
}
}
}
}
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