Failed to read values in CFPrefsPlistSource iOS 10
IosXcodeIos10Ios App-GroupIos Problem Overview
I've updated my Xcode 8 to beta 2 today and I'm trying to share data between App and Today Extension. I'm facing with this log warning:
> 2016-07-08 18:00:24.732472 ProjetctX[941:42801] [User Defaults] Failed > to read values in CFPrefsPlistSource<0x1700f1280> (Domain: > group.x.p.t.o, User: kCFPreferencesAnyUser, ByHost: Yes, Container: > (null)): Using kCFPreferencesAnyUser with a container is only allowed > for System Containers, detaching from cfprefsd
Anyone can help me?
Ios Solutions
Solution 1 - Ios
This is actually a spurious warning that was introduced in iOS 10 and macOS 10.12:
> NSUserDefaults tip: in the current OSs there's a logged error "…with a container is only allowed for System Containers…". > > This is spurious. > > Trying to catch a particular failure mode, caught a normal operation case at the same time. > > My successor on UserDefaults also has not figured out a way to make this less alarming without making the symptomatic case impossible to debug :/ > > https://twitter.com/Catfish_Man/status/784460565972332544 [thread]
The advice of prepending your team ID will silence the warning, but will also create a new empty user defaults. This will result in any previously stored data being unreadable.
For the time being, the solution is just to ignore it.
Also, Apple staff member CFM on the forums:
> The logged message is spurious unless you're doing very specific things that I don't think are possible without using private functions (it was added to catch misuse of those functions, but unfortunately also caught a normal usage case).
Solution 2 - Ios
Here’s how to use UserDefaults with App Groups to pass data between your main app and your extension:
-
In your main app, select your project in the Project Navigator.
-
Select your main app target and choose the Capabilities tab.
-
Toggle the App Groups switch to ON. This will communicate with the Developer Portal in order to generate a set of entitlements.
-
Create a new container. According to Apple, your container ID must start with "group", so a name such as "group.io.intrepid.myapp" is perfect.
-
Select your extension target and repeat the process of enabling App Groups. Do not create a new App Group, simply select the group that was just created in the main app target.
-
When reading or writing UserDefaults in either your app or your extension, do not access
UserDefaults.standard
. Instead useUserDefaults(suiteName: "group.io.intrepid.myapp")
. Note: The suite name is the name of your App Group container created in Step 4.
Make sure, group enable and using same group id for both extension and app capability section!
Credit goes to http://blog.intrepid.io/ios-app-extensions
Solution 3 - Ios
Change you group name in Xcode entitlements from:
group.com.mycompany.myapp
To
group.MYTEAMID.com.mycompany.myapp
ps: you can find your MYTEAMID in developer.apple.com membership
Solution 4 - Ios
Also had same issue with my macOS app.
Solved it by: Reboot the device!
Solution 5 - Ios
The SuiteName (postfix) must not be the main Bundle ID.
Solution 6 - Ios
The solution for me was to not use the same identifier for the application Bundle Identifier and the part after "group.".
Say, the app bundle id is "com.app.id", then group id as "group.com.app.id" is causing issues. After I change it to "group.com.app.id.something" it stops.
Solution 7 - Ios
I’m facing this same issue when I’m trying to use initWithSuiteName. Seems that this is a bug from Apple. The only solution / workaround I found is to reset all the settings of the device. Go to Settings -> General -> Reset -> Reset All Settings.
This doesn’t erase any content on the iPhone, just erases all the settings. After resetting the setting, everything worked fine. Let me know if it helps you too.
Solution 8 - Ios
Build with Xcode 8.1 Beta and you will see the same warning, but you will also get the value.
Solution 9 - Ios
By default, if you are using the Settings.Bundle/Root.plist for displaying and editing your app preferences via Apple Settings App, it uses the UserDefaults.standard dictionary.
So if you are using App-Groups and you want to share this defaults / settings within your apps and extension, you need to change the container of your settings.
Step 1: Open your Settings.Bundle -> Root.plist
Step2: Add the key ApplicationGroupContainerIdentifier and as value set your App-Group-Id, defined in your Signing & Capabilities: Looks like group.xx.yy
After you have implemented this step, the default container for your App-Settings will now switch from UserDefaults.standard (your apps Path) to the Shared Path.
Solution 10 - Ios
Set by example
NSUserDefaults *userDefaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.xxx.xxx"];
[userDefaults setValue:@"value" forKey:@"key"]
[userDefaults synchronize]; // return maybe false, but it doesn't matter
Get by
NSUserDefaults *userDefaults = [[NSUserDefaults alloc] init];
[userDefaults addSuiteNamed:@"group.com.xxx.xxx"];
NSString *value = [useDefaults valueForKey:@"key"];
Although the same error will still be printed when setting, the value is indeed set and can be read correctly. But I don't know why this is happening, it's just the result of various attempts.
Solution 11 - Ios
if you suffer this problem when you try to save data to extension APP by using userDefault
, maybe you had written this code:
[[NSUserDefaults standardUserDefaults] initWithSuiteName:@"group.xxx.com"];
This code reset default userDefault
.
Actually,the correct code is:
[[NSUserDefaults alloc] initWithSuiteName:@"group.xxx.com"];
Solution 12 - Ios
Change from
[[NSUserDefaults alloc] initWithSuiteName:@"group.com.xxx.xxx"];
to
[[NSUserDefaults alloc] initWithSuiteName:@"nnnnnnnnnn.group.com.xxx.xxx"];
Where nnnnnnnnn
is your team number, the one which you use to sign your code.
Tested under Xcode 8 GM and iOS 10 GM, and worked!