如何设置标签背景图像比例以适合Swift？

Question

我有一个用于显示某些消息的标签。我创建了一个图像，希望将其设置为标签背景。以下是我的操作方式：

challengeCell.message.text = "    You have taken  \(historyArray[indexPath.row]) in this week"

challengeCell.message.backgroundColor = UIColor(patternImage: UIImage(named: "challengeMessage")!)

    //this is a suggested attempt 
    challengeCell.message.systemLayoutSizeFitting(UILayoutFittingCompressedSize)

我想拉伸背景图像并填充整个标签，而不要重复。知道我该怎么做吗？

Answer 1

如果您希望该图像拉伸以填充标签宽度。试试这个代码。

challengeCell.message.systemLayoutSizeFitting(UILayoutFittingCompressedSize)

Answer 2

您不能为此使用图案颜色。使用UIImageView显示背景图像。在自定义单元格类中添加一个属性，以保留对图像视图的引用：

class ChallengeCell: UITableViewCell {
    let messageBackgroundView = UIImageView()

    override func layoutSubviews() {
        if messageBackgroundView.superview != message.superview {
            message.superview.insertSubview(messageBackgroundView, belowSubview: message)
            messageBackgroundView.translatesAutoresizingMaskIntoConstraints = false
            NSLayoutConstraint.activate([
                messageBackgroundView.leadingAnchor.constraint(equalTo: message.leadingAnchor),
                messageBackgroundView.trailingAnchor.constraint(equalTo: message.trailingAnchor),
                messageBackgroundView.topAnchor.constraint(equalTo: message.topAnchor),
                messageBackgroundView.bottomAnchor.constraint(equalTo: message.bottomAnchor),
            ])
            messageBackgroundView.contentMode = .scaleToFill
        }

        super.layoutSubviews()
    }

    ...
}

要设置消息背景时，请设置图像视图的图像：

challengeCell.messageBackgroundView.image = UIImage(named: "challengeMessage")