【Unity×iOS】バッテリー残量と充電状態を取得する方法｜UIDevice＋プラグイン連携で実装【コピペOK】

#import <UIKit/UIKit.h>

extern "C" {

// バッテリー残量を取得 (0.0～1.0)
float GetBatteryLevel()
{
    [UIDevice currentDevice].batteryMonitoringEnabled = YES;
    return [UIDevice currentDevice].batteryLevel;
}

// バッテリー充電状態を取得
// 0: Unknown, 1: Unplugged, 2: Charging, 3: Full
int GetBatteryState()
{
    [UIDevice currentDevice].batteryMonitoringEnabled = YES;
    return (int)[UIDevice currentDevice].batteryState;
}
}

using System.Runtime.InteropServices;
using UnityEngine;

public static class BatteryStatusPlugin
{
#if UNITY_IOS && !UNITY_EDITOR
    [DllImport("__Internal")] private static extern float GetBatteryLevel();
    [DllImport("__Internal")] private static extern int GetBatteryState();
#else
    private static float GetBatteryLevel() => 1.0f; // Editor仮値
    private static int GetBatteryState() => 2;      // Editor仮値 (Charging)
#endif

    public static float BatteryLevel => GetBatteryLevel();

    public static string BatteryState
    {
        get
        {
            switch (GetBatteryState())
            {
                case 0: return "Unknown";
                case 1: return "Unplugged";
                case 2: return "Charging";
                case 3: return "Full";
                default: return "Unknown";
            }
        }
    }
}

using UnityEngine;
using UnityEngine.UI;

public class BatteryUI : MonoBehaviour
{
    public Text batteryText;

    void Update()
    {
        float level = BatteryStatusPlugin.BatteryLevel;
        string state = BatteryStatusPlugin.BatteryState;
        batteryText.text = $"Battery: {Mathf.RoundToInt(level * 100)}% ({state})";
    }
}