[Springiness] Loading earlier messages results in garbled messages when using springiness

[kartikthapar]

Consider the following implementation in the example code —

- (void)collectionView:(JSQMessagesCollectionView *)collectionView
                header:(JSQMessagesLoadEarlierHeaderView *)headerView
didTapLoadEarlierMessagesButton:(UIButton *)sender
{
    // get earlier messages for example
    JSQMessage *message = [[JSQMessage alloc] initWithText:@"Hello" sender:kJSQDemoAvatarNameCook date:[NSDate date]];
    [self.messages insertObject:message atIndex:0];

    [self.collectionView.collectionViewLayout invalidateLayoutWithContext:[JSQMessagesCollectionViewFlowLayoutInvalidationContext context]];
    [self.collectionView reloadData];

    NSLog(@"Load earlier messages!");
}

The same issue doesn't come up when I disable springiness.

[kartikthapar]

I have a really f'd up fix for this and I have no clue why this is happening (first instinct I guess —)

- (void)collectionView:(JSQMessagesCollectionView *)collectionView
                header:(JSQMessagesLoadEarlierHeaderView *)headerView
didTapLoadEarlierMessagesButton:(UIButton *)sender
{
    self.collectionView.collectionViewLayout.springinessEnabled = NO;
    // < add message to messages, etc>
    self.collectionView.collectionViewLayout.springinessEnabled = YES;
    NSLog(@"Load earlier messages!");
}

Works when springiness is enabled in viewDidAppear:.

Again, no clue why this works.

[jessesquires]

Thanks @kartikthapar - as noted in the docs and in the demo, springiness is still an experimental feature.

This workaround makes perfect sense.

1. Turn off UIDynamics (also invalidates the layout)
2. Load new data
3. Turn on UIDynamics (also invalidates the layout)

[kartikthapar]

I guess I should read the fucking documentation. Thanks!

[jessesquires]

Hahaha 😆 👍

[jessesquires]

Hey @kartikthapar - some recent changes may have fixed this. Can you pull the latest from develop and see?

[kartikthapar]

I'll have an update on this shorty.

[kartikthapar]

I just added a simple text message —

JSQMessage *newMessage = [[JSQTextMessage alloc] initWithSenderId:kJSQDemoAvatarDisplayNameSquires
                                                senderDisplayName:kJSQDemoAvatarDisplayNameSquires
                                                             date:[NSDate date]
                                                             text:@"It Works (?)"];

[self.demoData.messages insertObject:newMessage atIndex:0];

[self.collectionView.collectionViewLayout invalidateLayoutWithContext:[JSQMessagesCollectionViewFlowLayoutInvalidationContext context]];
[self.collectionView reloadData];

and this seems to work absolutely fine. Thanks!

[jessesquires]

Awesome! thanks @kartikthapar !

[iphoneandroidtesting]

Hello @kartikthapar After tap on 'load earlier message',how can i show messages before "LoadEarlierMessages" button ,like as a facebook comments view.