iOS 13 - Attempting to store >= 4194304 bytes of data in CFPreferences/NSUserDefaults on this platform is invalid

Question

Created Aug ’19

Replies 18

Boosts 0

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Participants 16

I'm trying to store a 2 separated Strings (73067 bytes) and (280628 bytes) to User Defaults, in older iOS versions just work fine, but in iOS 13, i can't save this data.

This is how i save the data:

UserDefaults.standard.set(myData1, forKey: KEY_MY_DATA_1)

UserDefaults.standard.synchronize()

UserDefaults.standard.set(myData2, forKey: KEY_MY_DATA_2)

UserDefaults.standard.synchronize()

Throws this error on iOS 13:

2019-08-19 15:34:24.616570+0200 myAppName[4108:240228] [User Defaults] CFPrefsPlistSource<0x6000037cc980> (Domain: com.domain.myAppName, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): Attempting to store >= 4194304 bytes of data in CFPreferences/NSUserDefaults on this platform is invalid. This is a bug in myAppName or a library it uses.

Boost

Answer 1

Brian Co OP

Aug ’19

Hello @VincenDev. I actually have the samed bug on watchOS 6 with this message, when trying to store approximately 5mb of data :

Attempting to store >= 1048576 bytes of data in CFPreferences/NSUserDefaults on this platform is invalid. This is a bug in WatchApp Extension or a library it uses

On the other hand, I have no problem storing the same data in UserDefaults on iOS 13.

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Answer 2

VincenDev OP

Aug ’19

So ... what do we have to do? Is it a confirmed bug? Will it be fixed in next betas?

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Answer 3

VincenDev OP

Aug ’19

Problem persist in iOS 13 Beta 6

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Answer 4

totalidea OP

Aug ’19

Same issue on iOS 13.1 Beta. Any resolution? Any reason for this issue? Is the amount of data that can be stored in NSUserDefaulsts limited in iOS 13? The documentation does not list any API changes related to this.

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Answer 5

Jespercr OP

Oct ’19

I'm having the same problem. Unable to share image files to main app due to this constrain. Anyone knows if this will be fixed or if it is intentional?

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Answer 6

ChristopheC OP

Oct ’19

Hello every one,

I have exactly the same issue on iOS 13.1.3. Did you find any solution ?

Best regards,

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Answer 7

perecrisalix OP

Oct ’19

This problem persist in iPadOS 13.2

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Answer 8

appdev OP

Nov ’19

Could the issue possibly be the use of

synchronize

? According to the docs we are not supposed to use it anymore. It isn't officially deprecated, but it is not supposed to be used.

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Answer 9

ChristopheC OP

Nov ’19

I don't think so. I don't use "synchronize" and I got this error.

For me, it's when I try to store data >= 4mo in my UserDefaults group (ShareExtension <=> Host app).

1

Answer 10

simonfromhelix OP

Dec ’19

Does anyone have any news on this? I'm still seeing the problem occur on WatchOS 6.1.

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Answer 11

absinth OP

Feb ’20

we are also seeing this on macOS (Catalina) now, but tests have revealed that despite this message the actual saving and reading of the preferences still works fine. we've tested up to one million keys with a combined size of 30 MB. many error messages but the actual operations worked just fine.

Apple, whats the plan here?

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Answer 12

nikkovios OP

May ’20

[User Defaults] CFPrefsPlistSource<0x600000609200> (Domain: ***, User: kCFPreferencesCurrentUser, ByHost: No, Container: (null), Contents Need Refresh: Yes): Attempting to store >= 1048576 bytes of data in CFPreferences/NSUserDefaults on this platform is invalid. This is a bug in Target or a library it uses

TvOS Simulator 4K, 13+

Found the UserDefaults limit in TvOS is 500Kb https://developer.apple.com/library/archive/documentation/General/Conceptual/AppleTV_PG/index.html. Also tried the UserDefaults.sizeLimitExceededNotification to clear all with

if let appDomain = Bundle.main.bundleIdentifier {

UserDefaults.standard.removePersistentDomain(forName: appDomain)

}

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Answer 13

abhi.singh OP

May ’20

Any updates on this? I am still seeing this.

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Answer 14

caesss OP

Mar ’21

Bumping this iOS14.4 Xcode 12.4 still seeing this. Not able to save large data set.

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Answer 15

jaysonn OP

Aug ’21

Hi all, just wanted to add that I don't think this is a bug as UserDefaults was not built to house large data sets I believe. But only for small data sets accessed frequently.

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