如何设置标签背景图片比例以适应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，我想将其设置为我的标签背景。以下是我的做法：

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)

我想让背景图片拉伸并填满整个标签，而不是重复。知道我该怎么做吗？

Answer 1

如果您希望该图像应该被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。将属性添加到您的自定义单元格 class 以保存对图像视图的引用：

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()
    }

    ...
}

当你想设置消息背景时，设置图像视图的图像：

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

如何设置标签背景图片比例以适应Swift？

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