I am doing an chatting app by using Quick blox. I am not an expecting in code. when i run the app. The app gets crashed. I got an error. Chatting Message[1806:27316] -[_SwiftValue ctFontRef]: unrecognized selector sent to instance 0x600000253020 2017-05-16 10:23:38.982 Chatting Message[1806:27316] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_SwiftValue ctFontRef]: unrecognized selector sent to instance 0x600000253020'
override func collectionView(_ collectionView: QMChatCollectionView, dynamicSizeAt indexPath: IndexPath, maxWidth: CGFloat) -> CGSize { let item: QBChatMessage? = chatDataSource.message(for: indexPath) let viewClass: AnyClass = self.viewClass(forItem: item!) var size: CGSize? if viewClass == QMChatAttachmentIncomingCell.self || viewClass == QMChatAttachmentOutgoingCell.self { size = CGSize(width: CGFloat(min(200, maxWidth)), height: CGFloat(200)) } else {
// let attributedString: NSAttributedString? = self.attributedString(forItem: item!)
// size = TTTAttributedLabel.sizeThatFitsAttributedString(attributedString, withConstraints: CGSize(width: maxWidth, height: CGFloat(MAXFLOAT)), limitedToNumberOfLines: 0) } size = CGSize(width: CGFloat(min(200, maxWidth)), height: CGFloat(200)) return size! } override func collectionView(_ collectionView: QMChatCollectionView, minWidthAt indexPath: IndexPath) -> CGFloat { let item: QBChatMessage? = chatDataSource.message(for: indexPath) var size: CGSize? size = CGSize(width: CGFloat(1000), height: CGFloat(10000)) if item != nil { let attributedString: NSAttributedString? = item?.senderID == senderID ? bottomLabelAttributedString(forItem: item!) : topLabelAttributedString(forItem: item!) size = TTTAttributedLabel.sizeThatFitsAttributedString(attributedString, withConstraints: CGSize(width: CGFloat(1000), height: CGFloat(10000)), limitedToNumberOfLines: 1) } return size!.width } override func collectionView(_ collectionView: QMChatCollectionView, layoutModelAt indexPath: IndexPath) -> QMChatCellLayoutModel { var layoutModel: QMChatCellLayoutModel = super.collectionView(collectionView, layoutModelAt: indexPath) let item: QBChatMessage? = chatDataSource.message(for: indexPath) layoutModel.avatarSize = CGSize(width: CGFloat(0.0), height: CGFloat(0.0)) if item != nil { let topLabelString: NSAttributedString? = topLabelAttributedString(forItem: item!) let size1 = TTTAttributedLabel.sizeThatFitsAttributedString(topLabelString, withConstraints: CGSize(width: collectionView.frame.width, height: CGFloat.greatestFiniteMagnitude), limitedToNumberOfLines: 1) layoutModel.topLabelHeight = size.height } return layoutModel }