计算属性字符串高度

这是我使用的扩展.您不必传递有关字体或行高的任何信息,因为属性字符串已知道其值.

extension NSAttributedString {

func height(containerWidth: CGFloat) -> CGFloat {
    let rect = self.boundingRect(with: CGSize.init(width: containerWidth, height: CGFloat.greatestFiniteMagnitude), options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil)
    return ceil(rect.size.height)
}

func width(containerHeight: CGFloat) -> CGFloat {
    let rect = self.boundingRect(with: CGSize.init(width: CGFloat.greatestFiniteMagnitude, height: containerHeight), options: [.usesLineFragmentOrigin, .usesFontLeading], context: nil)
    return ceil(rect.size.width)
}

}

像这样使用:

let height = detailPetViewModel!.description.height(containerWidth: Sizes.screenWidth - 40 + 10)