Why is my Realm object not saving stored values?

Question

I was browsing around looking for a solution to implement a small offline data storage in one of my apps which would be easy and quick to use. Anyways, I came across with Realm

Answer 1

My guess would be viewWillDisappear is never being called. I would recommend committing your write transaction after each change to your data rather than leaving the transaction open as long as the view is visible - instead of adding the object at the end, you could change your other methods to commit the data:

- (void)viewDidLoad {

    self.realm = [RLMRealm defaultRealm]; // property type RLMRealm

    [realm beginWriteTransaction];
    self.myDataBase = [[iReceiptDataBase alloc] init]; // property type iReceiptDataBase
    [realm addObject:myDataBase];
    [realm commitWriteTransaction];

    receiptNumber = [myDataBase.receiptNo intValue];

    NSLog(@"In my realm database(first call) -> %@", myDataBase.receiptNo);
    NSLog(@"In my local app(first call) -> %d", receiptNumber);
}

-(void)drawPDF:(NSString*)fName {

    receiptNumber += 1; // property type int

    [realm beginWriteTransaction];
    myDataBase.receiptNo = [NSString stringWithFormat:@"%d", receiptNumber];
    [realm commitWriteTransaction];

    NSLog(@"In my realm database(second call) -> %@", myDataBase.receiptNo);
}

I would also consider storing receiptNo as an int on your data model.