'sizeWithFont(_:constrainedToSize:lineBreakMode:)' 不可用：使用 -boundingRectWithSize:options:attributes:context:

Question

我必须根据 TextView 的文本来扩展其大小，但它显示了问题，但我无法修复它，所以请帮我解决这个问题。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

我将this ObjC question 的答案翻译成 Swift；可能让你绊倒的是你需要将String 转换为NSString。

斯威夫特 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

斯威夫特 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