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

[jlk]

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 
>> <mailto: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 
>>> <mailto: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 <mailto:interest at qt-project.org> 
>>> Interest" <interest at qt-project.org <mailto: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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