Swift ios 如何判断标签文本是否被截断

Question

从情节提要中将行数标记为 3

以下是我用来确定标签文本是否被截断的代码

 let size = reviewLbl.text?.size(withAttributes: [.font: reviewLbl.font]) ?? .zero
    if (size.height > reviewLbl.frame.size.height) {

    }

也尝试关注 link 但它对我不起作用所以不要将此称为重复问题

How to check if UILabel is truncated?

Answer 1

试试这个扩展：

extension UILabel {

    var isTruncated: Bool {
        guard let labelText = text else { return false }

        let labelTextSize = (labelText as NSString).boundingRect(
            with: CGSize(width: frame.size.width, height: .greatestFiniteMagnitude),
            options: .usesLineFragmentOrigin,
            attributes: [.font: font],
            context: nil).size

        return labelTextSize.height > bounds.size.height
    }
}

并像这样使用它：

if myLabel.isTruncated {
   // Show more
}

Answer 2

  func countLabelLines() -> Int {
    // Call self.layoutIfNeeded() if your view is uses auto layout
    let myText = self.text! as NSString
    let attributes = [NSAttributedString.Key.font : self.font]

    let labelSize = myText.boundingRect(with: CGSize(width: self.bounds.width, height: CGFloat.greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: attributes as [NSAttributedString.Key : Any], context: nil)
    return Int(ceil(CGFloat(labelSize.height) / self.font.lineHeight))
}
  func isTruncatedOrNot() -> Bool {

    if (self.countLabelLines() > self.numberOfLines) {
        return true
    }
    return false
}

试试这个，self.bound.width 是你的标签宽度，所以如果你在堆栈视图中添加标签，请确保标签宽度或堆栈视图有适当的约束。
在您的情况下，它每次都返回 true，因为它可能有约束问题。

Swift ios 如何判断标签文本是否被截断

Swift ios how to find out Label text is truncated or not

fonts

truncate

uilabel

ios

swift