JSQMessagesViewController

JSQMessagesCollectionViewのTop位置調整

self.topContentAdditionalInset = {Top位置};

JSQMessagesCollectionViewCellの初期スクロール位置調整

self.automaticallyScrollsToMostRecentMessage = NO;
[self.collectionView reloadData];
[self.collectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:{行番号} inSection:0] 
                            atScrollPosition:UICollectionViewScrollPositionCenteredVertically
                                    animated:NO];

吹き出しのテキストカラーが一部黒字になってしまう場合の対処法

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                  cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    JSQMessagesCollectionViewCell *cell = (JSQMessagesCollectionViewCell *)[super collectionView:collectionView
                                                                          cellForItemAtIndexPath:indexPath];
    cell.textView.textColor = [UIColor whiteColor];
    return cell;
}

吹き出し画像の非同期取得

JSQPhotoMediaItem *item = [JSQPhotoMediaItem new];
message = [[JSQMessage alloc] initWithSenderId:{SenderID}
                             senderDisplayName:{SenderName}
                                          date:{Date}
                                         media:item];

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    NSURL *url = [NSURL URLWithString:@"{画像URL}"];
    NSData *data = [NSData dataWithContentsOfURL:url];
    item.image = [[UIImage alloc] initWithData:data cache:NO];

    dispatch_async(dispatch_get_main_queue(), ^{
        [self.collectionView reloadData];
    });
});

[_messages addMessage:message];

吹き出しの上部に送受信時刻を表示

// CellTopLabelの表示位置
- (CGFloat)collectionView:(JSQMessagesCollectionView *)collectionView
                   layout:(JSQMessagesCollectionViewFlowLayout *)collectionViewLayout
                   heightForCellTopLabelAtIndexPath:(NSIndexPath *)indexPath
{
    // default:20.0f
    return kJSQMessagesCollectionViewCellLabelHeightDefault;
}

// CellTopLabelの表示
- (NSAttributedString *)collectionView:(JSQMessagesCollectionView *)collectionView
                   attributedTextForCellTopLabelAtIndexPath:(NSIndexPath *)indexPath
{
    return [[JSQMessagesTimestampFormatter sharedFormatter] attributedTimestampForDate:{送受信時刻}];
}