URLForUbiquityContainerIdentifier returns nil even if configured correctly

问题

I am having the problem, that URLForUbiquityContainerIdentifier is returning nil in some cases even if the user has set up everything correctly in the settings. My code:

dispatch_async(someQueue, ^{

    if (![[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil]) {
        ErrLog(@"iCloud container not available.");
        return;
    }

    dispatch_async(dispatch_get_main_queue(), ^{
       [...]
    });

});

Does anybody came across the same problem? I am setting nil as the container identifier which should work according to the Apple docs, but I am not so convinced anymore about that. Also this code works fine for the majority of users, but somehow not for everybody.

回答1:

Check that you have enabled iCloud containers in your entitlement. The containers are not added by default when you enable entitlements. Click the "+" sign in Target/Summary/Entitlements to add your appId.

回答2:

iPad mini with iOS7. I just have experienced that URLForUbiquityContainerIdentifier suddenly started to return nil. I tried restarting the device, but it didn't help.

Inside the Settings app, under the 'iCloud' menu. I noticed that 'Documents & Data' was set to Off.

Solution was to change 'Documents & Data' to 'On'.

回答3:

If anyone is having the same problem using the iOS8 Betas, there seems to be a bug with the way the Entitlements are generated in Xcode 6. I was banging my head against this for days until coming across this post in the Apple Developer Forums: https://devforums.apple.com/thread/229509?

Essentially, Xcode generates a key named com.apple.developer.icloud-container-identifiers when it should be com.apple.developer.ubiquity-container-identifiers (ubiquity, not icloud). It may also have the value set as iCloud.$(CFBundleIdentifier) when it should be $(TeamIdentifierPrefix).$(CFBundleIdentifier).

Of course this may get fixed in the next Beta but for anyone as confused as me I hope this helps.

回答4:

I'd look at your entitlement.plist on one app I needed to change $(TEAMID) to profile id the numbers and letter before the dns in the profile - here is some code that will work with UIManagedDocument

/// test iCloud Access
- (void)initializeiCloudAccess {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        if ([[NSFileManager defaultManager]
             URLForUbiquityContainerIdentifier:nil] != nil)
            NSLog(@"iCloud is available\n");
        else
            NSLog(@"This Application requires iCloud, but it is not available.\n");
    });
}

- (NSURL *)iCloudURL
{

    return [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
}

- (NSURL *)iCloudDocumentsURL
{

    return [[self iCloudURL] URLByAppendingPathComponent:@"Documents"];
}

- (NSURL *)iCloudCoreDataLogFilesURL
{

    return [[self iCloudURL] URLByAppendingPathComponent:@"CoreDataLogs"];
}

回答5:

URLForUbiquityContainerIdentifier alway return nil

NSURL *ubiquityURL = [fileManager URLForUbiquityContainerIdentifier:nil]; if (ubiquityURL == nil)

app build by xcode4.5
app is enable icloud
ios is loginned icloud account

ubiquityURL is normal in debug, but ubiquityURL is always nil after distribution to appstore.

回答6:

Today I experienced this problem again.

This time it was because I had an invalid provisioning profile.

On the developer site, I had to generate a new provisioning profile. Afterward reload the provisioning profiles within Xcode5. Now URLForUbiquityContainerIdentifier again returns valid urls.

回答7:

If you still having issue o make sure you are running on a device as simulator wont always return a valid value . I tried you code on my app and Im not getting nil

回答8:

Enable "iCloud Drive" in the iPhone's Settings

来源：https://stackoverflow.com/questions/8505307/urlforubiquitycontaineridentifier-returns-nil-even-if-configured-correctly

标签

iphone

objective-c

ios

icloud