如何在Xamarin.Forms中检测iOS自动日期时间设置？Android已实现

Hey there! Glad you got the Android side sorted out—let's get that iOS implementation working for you too. 😎

iOS Implementation Details #

Unlike Android, iOS doesn't expose a direct Settings class for this, but we can access the auto date/time setting via NSUserDefaults using a well-known system key. Here's how to do it in Xamarin.iOS:

First, add the necessary namespace:

using Foundation;

Then, to check if auto date/time is enabled:

bool isAutoTimeEnabled = NSUserDefaults.StandardUserDefaults.BoolForKey("AppleAutoTime");

Bonus: Listen for Setting Changes #

If you need to react when the user toggles this setting later, you can register a notification observer:

// Register the observer (do this once, e.g., in your ViewController's ViewDidLoad)
NSNotificationCenter.DefaultCenter.AddObserver(
    NSNotification.Name.NSSystemClockDidChange, 
    (notification) => {
        // Refresh the value and handle the change
        bool updatedAutoTime = NSUserDefaults.StandardUserDefaults.BoolForKey("AppleAutoTime");
        // Your logic here
    });

Cross-Platform Wrapper (Xamarin.Forms Best Practice) #

To keep things clean in your Xamarin.Forms app, wrap this logic in a DependencyService:

1. Define the interface in your shared project:

public interface IDateTimeSettings
{
    bool IsAutoDateTimeEnabled();
}

2. Android Implementation:

[assembly: Dependency(typeof(DateTimeSettingsAndroid))]
namespace YourAppNamespace.Droid
{
    public class DateTimeSettingsAndroid : IDateTimeSettings
    {
        public bool IsAutoDateTimeEnabled()
        {
            try
            {
                int autoTimeValue = Android.Provider.Settings.Global.GetInt(
                    Android.App.Application.Context.ContentResolver, 
                    Android.Provider.Settings.Global.AutoTime, 
                    0);
                return autoTimeValue == 1;
            }
            catch
            {
                // Fallback if access fails
                return false;
            }
        }
    }
}

3. iOS Implementation:

[assembly: Dependency(typeof(DateTimeSettingsiOS))]
namespace YourAppNamespace.iOS
{
    public class DateTimeSettingsiOS : IDateTimeSettings
    {
        public bool IsAutoDateTimeEnabled()
        {
            try
            {
                return NSUserDefaults.StandardUserDefaults.BoolForKey("AppleAutoTime");
            }
            catch
            {
                // Fallback if access fails
                return false;
            }
        }
    }
}

4. Use it in your shared code:

bool autoDateTimeEnabled = DependencyService.Get<IDateTimeSettings>().IsAutoDateTimeEnabled();

Notes #

• The AppleAutoTime key is a widely used system-level key for this setting, and it's been reliable across iOS versions. While it's not officially documented by Apple, it's commonly used in production apps without issues.
• No additional permissions are required to read this value on iOS.

内容的提问来源于stack exchange，提问作者hashimks