Question

我正在使用SlackTextViewController构建一个聊天视图，我花了一天时间来改进视觉效果，使其更加现代化。但是，heightForRowAtIndexPath无法正确计算消息中文本的高度。来自朋友的用户接收的消息具有专用于他们的屏幕宽度的70％，其中一部分被降级为32x32的化身。我认为问题源于titleBounds和BodyBounds。

我有两组独立的变量用于用户发送和用户接收的消息。因此检查“测试自我”。

let message = self.messages[indexPath.row]
        var defaultFontSize = MessageCell.defaultFontSize
        var minimumHeight = MessageCell.kMessageTableViewCellMinimumHeight
        var avatarHeight = MessageCell.kMessageTableViewCellAvatarHeight
        if message.username == "Test Self" {
            defaultFontSize = SelfMessageCell.defaultFontSize
            minimumHeight = SelfMessageCell.kMessageTableViewCellMinimumHeight
            avatarHeight = 0
        }

        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineBreakMode = .ByWordWrapping
        paragraphStyle.alignment = .Left

        let pointSize = defaultFontSize

        let attributes = [
            NSFontAttributeName : UIFont.systemFontOfSize(pointSize),
            NSParagraphStyleAttributeName : paragraphStyle
        ]

        var width = (CGRectGetWidth(tableView.frame) * 0.7) - avatarHeight
        width -= 25.0

        let titleBounds = (message.username as NSString).boundingRectWithSize(CGSize(width: width, height: CGFloat.max), options: .UsesLineFragmentOrigin, attributes: attributes, context: nil)
        let bodyBounds = (message.messageContents as NSString).boundingRectWithSize(CGSize(width: width, height: CGFloat.max), options: .UsesLineFragmentOrigin, attributes: attributes, context: nil)

        if message.messageContents.characters.count == 0 {
            return 0
        }

        var height = CGRectGetHeight(titleBounds)
        height += CGRectGetHeight(bodyBounds)

        if height < minimumHeight {
            height = minimumHeight
        }
        return height

这是UITableViewCell的代码

override func layoutSubviews() {
    super.layoutSubviews()

    let width = self.bounds.width * 0.3
    chatBubble.frame = CGRectMake(34, 23, self.bounds.width - 36 - width, self.bounds.height - 28)
    usernameLabel.frame = CGRectMake(4, 5, chatBubble.frame.size.width - 8, 16)
    messageLabel.frame = CGRectMake(20,4,chatBubble.frame.size.width - 28,chatBubble.frame.size.height - 4)
    avatarView.frame = CGRectMake(2, self.bounds.height - 30, 32, 32)
}

这是init（）

chatBubble = UIImageView(frame: CGRectZero)
    chatBubble.contentMode = .ScaleToFill
    chatBubble.image = UIImage(named: "ChatBubble")
    contentView.addSubview(chatBubble)

    usernameLabel = UILabel(frame: CGRectZero)
    usernameLabel.font = UIFont(name: "HelveticaNeue-Light", size: 16)
    usernameLabel.textAlignment = .Left
    usernameLabel.textColor = UIColor.grayColor()
    contentView.addSubview(usernameLabel)

    messageLabel = UILabel(frame: CGRectZero)
    messageLabel.font = UIFont(name: "HelveticaNeue", size: 16)
    messageLabel.numberOfLines = 0
    messageLabel.lineBreakMode = .ByWordWrapping
    messageLabel.textAlignment = .Left
    messageLabel.textColor = UIColor.blackColor()
    chatBubble.addSubview(messageLabel)

为什么我的UITableView单元格根据它们有多少文本而没有正确调整大小？

0 个答案: