[Interest] Qt iOS / App Groups / NSUserDefaults initWithSuiteName / Not persisting

[Nuno Santos]

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];
}
_______________________________________________
Interest mailing list
Interest@qt-project.org
http://lists.qt-project.org/mailman/listinfo/interest