Question

我必须根据文本扩展TextView的大小，但它已显示问题，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

我将答案从this ObjC question翻译成斯威夫特;绊倒你的是你需要将String投射到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

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

1 个答案: