如何仅使用NSUbiquitousKeyValueStore以编程方式检测用户设备上是否启用了iCloud？ [英] How to programmatically detect if the iCloud is enabled on user's device when only use NSUbiquitousKeyValueStore?

问题描述

我正在使用 NSUbiquitousKeyValueStore 将某些偏好数据同步到iCloud。我发现如果用户在设置应用程序中禁用iCloud的文档和数据项， NSUbiquitousKeyValueStore 无法将其数据同步到iCloud。所以，我想首先检查此设置是否已打开。我找到了这段代码片段：

I am using NSUbiquitousKeyValueStore to sync some preference data to iCloud. I found that if the user disable "Document & Data" item of iCloud in "Setting App", NSUbiquitousKeyValueStore can not synchronize its data to iCloud. So, I want to first check if this setting is switched on. I found this Code snippet：

    NSURL *ubiq = [[NSFileManager defaultManager] 
                   URLForUbiquityContainerIdentifier:nil];
    NSLog(@"url=%@",ubiq);
    if (!ubiq) {
        UIAlertView *av = [[UIAlertView alloc] initWithTitle:nil message:@"Please enable iCloud in Setting app" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [av show];
        return;

    }

我想知道的是这是否是唯一的方法检测，即使我只使用 NSUbiquitousKeyValueStore （不是iCloud文档存储）。还有更好的选择吗？

What I want to know is whether this is the only way to detect, even if I just use NSUbiquitousKeyValueStore (not iCloud document storage). Is there a better alternative?

推荐答案

基本上， NSUbiquitousKeyValueStore 始终可用即使用户没有iCloud帐户（在这种情况下， NSUbiquitousKeyValueStore 只是一个简单的本地存储）。因此，一般情况下，您无需询问自己或用户是否配置了iCloud帐户。

Basically, NSUbiquitousKeyValueStore is always available, even if the user does not have an iCloud account (in this case, NSUbiquitousKeyValueStore is just a simple local storage). So in general, you don't need to ask yourself or the user if there is a configured iCloud account.

如果您确实想知道，请在iOS 5中，唯一的解决方案是你提到的那个。

If you really want to know for sure, in iOS 5, the only solution is the one you're mentioning.

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