从 MonoTouch 访问 iCloud NSUbiquitousKeyValueStoreDidChangeExternallyNotification 详细信息

Posted 2023-03-08

【中文标题】从 MonoTouch 访问 iCloud NSUbiquitousKeyValueStoreDidChangeExternallyNotification 详细信息

【英文标题】：Accessing iCloud NSUbiquitousKeyValueStoreDidChangeExternallyNotification details from MonoTouch

【发布时间】：2012-02-07 04:07:46

【问题描述】：

在 MonoTouch 下，我想访问 NSUbiquitousKeyValueStoreDidChangeExternallyNotification（ios5/iCloud 键值入站更新）通知数据：

NSUbiquitousKeyValueStoreChangeReasonKey -> NSNumber NSUbiquitousKeyValueStoreChangedKeysKey -> NSString 的 NSArray

有一个示例@http://docs.xamarin.com/@api/deki/files/321/=iCloud.zip，但是上面访问的代码被注释掉并且有问题（它如何尝试将原因转换为整数是错误的）。我就在附近：

NSNotificationCenter.DefaultCenter.AddObserver(new NSString("NSUbiquitousKeyValueStoreDidChangeExternallyNotification"), 
delegate(NSNotification n)  

    NSDictionary userInfo = n.UserInfo;
    NSNumber reason = (NSNumber)userInfo.ObjectForKey(
        new NSString("NSUbiquitousKeyValueStoreChangeReasonKey"));
    int ireason = reason.IntValue;
    NSArray changedKeys = (NSArray)userInfo.ObjectForKey(
        new NSString("NSUbiquitousKeyValueStoreChangedKeysKey"));
);

我想出了如何将原因作为整数。但是如何将 NSStrings 的 NSArray 转换为 一个简单的字符串[]??抱歉，我以前从未使用过核心的 Objective-C 类型包装器。

【参考方案1】：

希望这会有所帮助 ~ 使用从 NSArray.ValueAt() 方法返回的 IntPtr 来新建一个 NSString 并访问您所追求的值。

NSNotificationCenter.DefaultCenter.AddObserver (
    NSUbiquitousKeyValueStore.DidChangeExternallyNotification
    , delegate (NSNotification n)

    Console.WriteLine("Cloud notification received");
    NSDictionary userInfo = n.UserInfo;

    NSNumber reason = (NSNumber)userInfo.ObjectForKey(NSUbiquitousKeyValueStore.ChangeReasonKey);
    int ireason = reason.IntValue;
    Console.WriteLine("reason.IntValue: " + ireason);

    NSArray changedKeys = (NSArray)userInfo.ObjectForKey (NSUbiquitousKeyValueStore.ChangedKeysKey);
    var changedKeysList = new System.Collections.Generic.List<string> ();
    for (uint i = 0; i < changedKeys.Count; i++)
    
        var key = new NSString (changedKeys.ValueAt(i));
        Console.WriteLine("changedKey IntPtr: " + changedKeys.ValueAt(i));
        Console.WriteLine("changedKey (value): " + key);

        changedKeysList.Add (key);
    
    // now do something with the list...
);

【讨论】：

感谢@CraigD。如果它可以帮助其他人，这里是您发送的枚举值： public enum NSUbiquitousKeyValueStoreChangeReason ServerChange = 0, InitialSyncChange = 1, QuotaViolationChange = 2