[Interest] Qt iOS / App Groups / NSUserDefaults initWithSuiteName / Not persisting (Nuno Santos)

[Nuno Santos]

Yes, I can! The problem is when I close the app and start it again. The result is null.

Data is not being persisted and I do t understand why... :(

--
Nuno Santos

No dia 15/11/2018, às 19:07, jlk <jlk2144 at gmail.com> escreveu:

> Hi Nuno,
> 
>    Can you save and restore a simple NSObject, say an NSString?. If so, your problem is probably with converting the QVariant to NSObject. I have not used Qt with iOS yet so I don't have any deeper help than that, sorry!
>    However, Maybe there are helper functions you need to write first? Could you use a JSON converter to represent your QVariant as an (NS)string for storage?
> Colin
> 
>> On 11/15/18 1:31 PM, Nuno Santos wrote:
>> Colin,
>> 
>> Thanks for your reply.
>> 
>> While you are right considering the code I have posted here, the truth is that in my actual code I have the setObject. But since I have more stuff going on I didn’t want to flood the list with code:
>> 
>> void Settings::setSharedKey(QString key, QVariant value)
>> {
>>     if (defaults==nil)
>>         defaults = [[NSUserDefaults alloc] initWithSuiteName:@“group.com.acme.app"];
>> 
>>     [defaults setObject:[ISettingsManagerCocoaHelper variantToNSObject:value] forKey:key.toNSString()];
>>     [defaults synchronize];
>> }
>> 
>> I’m still struggling with this. I can’t have the           settings saved. I’m tired to googling and trying stuff. 
>> 
>> Any ideas? Do you have anything similar?
>> 
>> Thanks!
>> 
>> Regards,
>> 
>> Nuno
>> 
>>> On 15 Nov 2018, at 17:17, Colin Worth <jlk2144 at gmail.com> wrote:
>>> 
>>> Hi Nuno,
>>>    You are missing a line, something like:
>>> 
>>>    [defaults setValue:object forKey:key]
>>> 
>>> in setSharedKey.
>>> 
>>>> 
>>>> From: Nuno Santos <nunosantos at imaginando.pt>
>>>> Subject: [Interest] Qt iOS / App Groups / NSUserDefaults initWithSuiteName / Not persisting
>>>> Date: November 14, 2018 at 7:24:06 AM AST
>>>> To: "interest at qt-project.org Interest" <interest at qt-project.org>
>>>> 
>>>> 
>>>> Hi,
>>>> 
>>>> I’m trying to persist data in a App Group on Qt iOS app to share data between a standalone app and app extension.
>>>> 
>>>> I have been reading on how to do it and apparently is dead simple -> https://developer.apple.com/library/archive/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW6
>>>> 
>>>> The problem is that it is not persisting data…. 
>>>> 
>>>> I’m starting to question the model I’m following in terms of code. I have my Settings manager in C++. What I have done was to create a SettingsCocoa.mm file that does what is below.
>>>> 
>>>> In a app session, the value is persisted but as soon as I start the app again, the value is null. 
>>>> 
>>>> As anyone experienced similar issues before? Any ideas would be highly appreciated.
>>>> 
>>>> Thanks in advance.
>>>> 
>>>> Best regards,
>>>> 
>>>> Nuno
>>>> 
>>>> 
>>>> #include "Settings.h"
>>>> 
>>>> #import <Foundation/Foundation.h>
>>>> #include <QDebug>
>>>> 
>>>> static NSUserDefaults *defaults = nil;
>>>> 
>>>> QVariant Settings::sharedKey(QString key, const QVariant &defaultValue) const
>>>> {
>>>>     if (defaults==nil)
>>>>         defaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.acme.app"];
>>>> 
>>>>     NSObject *value = [defaults valueForKey:key.toNSString()];
>>>>     NSLog(@"get object: %@", value);
>>>> }
>>>> 
>>>> void Settings::setSharedKey(QString key, QVariant value)
>>>> {
>>>>     if (defaults==nil)
>>>>         defaults = [[NSUserDefaults alloc] initWithSuiteName:@"group.com.acme.app"];
>>>> 
>>>>     NSObject *object = [ISettingsManagerCocoaHelper variantToNSObject:value];
>>>>     NSLog(@"set object: %@", object);
>>>> 
>>>>     sharedKey(key, value);
>>>> 
>>>>     [defaults synchronize];
>>>> }
>>>> 
>> 
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