如何使用Swift 3在Read More / Less中设置自动调整的标签高度？ [英] How to set label height for auto adjust in Read More/Less with Swift 3?

问题描述

我想在最后创建带有Read More / Read Less的段落。这是我的代码;

I would like to create the paragraph with Read More/Read Less at the end.
Here are my codes;

func getLabelHeight(text: String, width: CGFloat, font: UIFont) -> CGFloat {

    let lbl = UILabel(frame: .zero)
    lbl.frame.size.width = width
    lbl.font = font
    lbl.numberOfLines = 0
    lbl.text = text
    lbl.sizeToFit()
    lbl.adjustsFontSizeToFitWidth = true
    return lbl.frame.size.height

}

 @IBAction func btnReadMore(_ sender: Any) {
    if isLabelAtMaxHeight {

        btnReadmore.setTitle(NSLocalizedString("Read more", comment: ""), for: .normal)
        btnReadmore.titleLabel!.font = UIFont (name: "Tharlon", size: 13)
        isLabelAtMaxHeight = false
        lblReviewHeight.constant = 29
        lblReview.font = UIFont (name: "Tharlon", size: 13)


    }
    else {

        btnReadmore.setTitle(NSLocalizedString("Read less", comment: ""), for: .normal)
        btnReadmore.titleLabel!.font = UIFont (name: "Tharlon", size: 13)
        isLabelAtMaxHeight = true
        lblReviewHeight.constant = getLabelHeight(text: lblReview.text!, width: view.bounds.width, font: lblReview.font)
        lblReview.font = UIFont (name: "Tharlon", size: 13)
        lblReview.lineBreakMode = NSLineBreakMode.byTruncatingHead

    }

}

我还在Attributes Inspector中设置了自动换行标签。

问题是当我在Read Less部分中添加NSLineBreakMode.byTruncatingHead时，所有文本都会完整显示。但是，文本中那些地方的一些词语消失了。

I also set the label "Word wrap" in Attributes Inspector.
The problem is that when I add "NSLineBreakMode.byTruncatingHead" in Read Less part, all the texts show completely. But, some words in those places inside text disappear.

因此，我删除了该代码并运行该应用程序。那时，文本没有完全显示，只显示了一半。我一直在努力解决这个问题。

我不想使用任何其他库。

有人可以帮帮我吗？

So, I remove that code and run the app. At that time, texts are not shown completely and only show half. I've been trying to solve this problem the whole day.
I don't want to use any other library.
Could anyone help me please?

推荐答案

删除约束 lblReviewHeight ，然后尝试使用 numberOfLines 控制文本布局，如果你想要显示所有描述集 numberOfLines = 0 ，否则将 numberOfLines 设置为您想要的行。

Remove constraint lblReviewHeight, then just try to use numberOfLines control your text layout, if your want show all description set numberOfLines = 0, otherwise set numberOfLines to the line you want.

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