调用Shiny IBeaconRangingManager的RequestAccess在iOS 13.5上崩溃

崩溃原因 #

从崩溃日志核心信息 -[CLLocationManager authorizationStatus]: unrecognized selector sent to instance 可明确原因：

• iOS 13.5 及更早版本中，authorizationStatus 是 CLLocationManager 的类方法，而非实例方法。
• Shiny 库的 LocationExtensions.GetCurrentStatus 方法在处理 iOS 13.5 时，错误调用了 CLLocationManager 实例的 AuthorizationStatus 属性（对应 Objective-C 实例方法），而非类方法 CLLocationManager.AuthorizationStatus()，导致系统抛出无法识别选择器的异常。

解决方案 #

1. 升级 Shiny NuGet 包 #

优先检查 Shiny 库最新版本，官方大概率已修复 iOS 版本兼容性问题。更新至最新稳定版后，重新测试 iOS 13.5 设备，确认崩溃是否消失。

2. 自定义 iOS 平台特定权限兼容逻辑 #

若暂时无法升级 Shiny，可在 iOS 项目中添加平台特定代码，手动处理权限检查，规避 Shiny 的兼容问题：

// iOS 平台代码文件（如 Platforms/iOS/BeaconAccessHandler.cs）
using CoreLocation;
using Shiny.Locations;
using UIKit;

public static class BeaconAccessHelper
{
    public static AccessState GetCurrentLocationAccessStatus(bool background)
    {
        var osVersion = UIDevice.CurrentDevice.SystemVersion;
        if (Version.Parse(osVersion) <= new Version(13, 5))
        {
            // iOS 13.5 及以下调用类方法获取权限状态
            var status = CLLocationManager.AuthorizationStatus;
            return MapStatusToAccessState(status, background);
        }
        else
        {
            // iOS 14+ 使用实例方法
            using var manager = new CLLocationManager();
            var status = manager.AuthorizationStatus;
            return MapStatusToAccessState(status, background);
        }
    }

    private static AccessState MapStatusToAccessState(CLAuthorizationStatus status, bool background)
    {
        return status switch
        {
            CLAuthorizationStatus.AuthorizedAlways => AccessState.Available,
            CLAuthorizationStatus.AuthorizedWhenInUse => background ? AccessState.Denied : AccessState.Available,
            CLAuthorizationStatus.Denied => AccessState.Denied,
            CLAuthorizationStatus.Restricted => AccessState.Restricted,
            _ => AccessState.Unknown
        };
    }
}

修改原 CheckAccess 方法，针对 iOS 平台调用自定义逻辑：

public async Task<string?> CheckAccess()
{
    var translationService = _serviceProvider.GetService<ITranslationService>();
    if (translationService == null)
        return null;

#if IOS
    var accessState = BeaconAccessHelper.GetCurrentLocationAccessStatus(false);
    if (accessState != AccessState.Available)
    {
        using var manager = new CLLocationManager();
        if (UIDevice.CurrentDevice.CheckSystemVersion(14, 0))
            await manager.RequestWhenInUseAuthorizationAsync();
        else
            manager.RequestWhenInUseAuthorization();
            
        accessState = BeaconAccessHelper.GetCurrentLocationAccessStatus(false);
        if (accessState != AccessState.Available)
            return translationService.GetText("global_syn_permission_bluetooth");
    }
#else
    var beaconRangingManager = _serviceProvider.GetService<IBeaconRangingManager>();
    if (beaconRangingManager != null)
    {
        var accessState = await beaconRangingManager.RequestAccess();
        if (accessState != AccessState.Available)
            return translationService.GetText("global_syn_permission_bluetooth");
    }
#endif

    return null;
}

3. 捕获异常并降级处理 #

若上述方案无法快速实施，可在 CheckAccess 方法中捕获特定异常，直接返回权限提示：

public async Task<string?> CheckAccess()
{
    var beaconRangingManager = _serviceProvider.GetService<IBeaconRangingManager>();
    var translationService = _serviceProvider.GetService<ITranslationService>();

    if (beaconRangingManager != null && translationService != null)
    {
        try
        {
            var accessState = await beaconRangingManager.RequestAccess();
            if (accessState != AccessState.Available)
                return translationService.GetText("global_syn_permission_bluetooth");
        }
        catch (Exception ex) 
            when (ex.Message.Contains("unrecognized selector sent to instance") && ex.Message.Contains("authorizationStatus"))
        {
            return translationService.GetText("global_syn_permission_bluetooth");
        }
    }

    return null;
}

内容的提问来源于stack exchange，提问作者BeRo