ios - 如何根据String长度获取CGFloat/CGSize？

Question

我有一个 UIView，它充当容器，并且该容器的宽度需要根据最长的字符串动态更改。所以我想根据字符串长度获取CGFloat/CGSize，还可以吗？

看起来最有用的方法现在已经被贬值了......

myStringSize : CGSize  = [longestString sizeWithFont:myFont 
                       constrainedToSize:maximumSize 
                       lineBreakMode:self.myLabel.lineBreakMode];

我不想将其基于标签，而是希望将其基于字符串

Answer 1

您必须给出已知的宽度或高度:

extension String {

    func getHeight(with width: CGFloat, font: UIFont) -> CGFloat {
        let maxSize = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)
        let actualSize = self.boundingRect(with: maxSize, options: [.usesLineFragmentOrigin], attributes: [NSFontAttributeName: font], context: nil)
        return actualSize.height
    }


    func getWidth(with height: CGFloat, font: UIFont) -> CGFloat {
        let maxSize = CGSize(width: CGFloat.greatestFiniteMagnitude, height: height)
        let actualSize = self.boundingRect(with: maxSize, options: [.usesLineFragmentOrigin], attributes: [NSFontAttributeName: font], context: nil)
        return actualSize.width
    }
}