ios - 'sizeWithFont(_ :constrainedToSize:lineBreakMode:)' is unavailable: Use -boundingRectWithSize:options:attributes:context:

Question

我必须根据其文本扩展 TextView 的大小，但它显示了问题，但我无法解决它，所以请帮助我解决这个问题。我发布了我尝试过的代码。

var size: CGSize = text.sizeWithFont(UIFont.boldSystemFontOfSize(13), constrainedToSize: textSize, lineBreakMode:NSLineBreakMode.ByWordWrapping)

Answer 1

我翻译了this ObjC question的答案进入 swift ；可能让您感到困惑的是您需要将 String 转换为 NSString。

swift 4

let text = "Hello"
let font = UIFont.systemFont(ofSize: UIFont.systemFontSize)
let maxSize = CGSize(width: 100, height: CGFloat.greatestFiniteMagnitude)

let size = (text as NSString).boundingRect(with: maxSize,
        options: [.usesLineFragmentOrigin, .usesFontLeading],
        attributes: [NSFontAttributeName:font],
        context: nil)
    .size

swift 3

let text = "Hello"
let font = UIFont.systemFontOfSize(UIFont.systemFontSize())
let maxSize = CGSize(width: 100, height: CGFloat.max)

let size = (text as NSString).boundingRectWithSize(maxSize,
        options: [.UsesLineFragmentOrigin, .UsesFontLeading],
        attributes: [NSFontAttributeName:font],
        context: nil)
    .size