如何评估字符串宽度并转换为CGFloat（swift）

Question

我找到了这些代码，但似乎无效。

 func evaluateStringWidth (textToEvaluate: String) -> CGFloat{
    letfont = NSFont.userFontOfSize(NSFont.systemFontSize())
    let attributes = NSDictionary(object: font!, forKey:NSFontAttributeName)
    let sizeOfText = textToEvaluate.sizeWithAttributes((attributes as! [String : AnyObject]))
    return sizeOfText.width
}

Answer 1

我不明白你的意思。 所以，我通过猜测回答。

func evaluateStringWidth (textToEvaluate: String) -> CGFloat {
    let maxSize = self.view.frame.size //set your view or label size
    let attributesDictionary = [NSFontAttributeName: UIFont.systemFontOfSize(14.0)] //set your font object
    let textSize = NSString(string: textToEvaluate).boundingRectWithSize(maxSize, options: .UsesLineFragmentOrigin, attributes: attributesDictionary, context: nil)

    return textSize.width
}