UIButton標題標簽的粗體部分

Question

在SO上遇到它們之后，我嘗試了幾種不同的方法和擴展，但均無濟於事。 有沒有確定的方法來僅加粗UIButton.titleLabel的一部分？

這些是我嘗試過的一些擴展：

func attributedText(fullStr: String, boldStr: String) -> NSAttributedString {

                let attributedString = NSMutableAttributedString(string: fullStr as String, attributes: [NSFontAttributeName:UIFont.systemFontOfSize(12.0)])

                let boldFontAttribute = [NSFontAttributeName: UIFont.boldSystemFontOfSize(12.0)]

                // Part of string to be bold
                attributedString.addAttributes(boldFontAttribute, range: NSMakeRange(0, boldStr.characters.count))


               return attributedString
}


func boldRange(range: Range<String.Index>) {
                if let text = self.attributedTitleForState(UIControlState.Normal) {
                    let attr = NSMutableAttributedString(attributedString: text)
                    let start = text.string.startIndex.distanceTo(range.startIndex)
                    let length = range.startIndex.distanceTo(range.endIndex)
                    attr.addAttributes([NSFontAttributeName: UIFont.boldSystemFontOfSize(16)], range: NSMakeRange(start, length))
                    self.setAttributedTitle(attr, forState: UIControlState.Normal)
                }
}


func boldSubstring(substr: String) {
                let range = substr.rangeOfString(substr)
                if let r = range {
                    boldRange(r)
                }
}

有人有什么嗎

Answer 1

除了一點點可以做的姿勢和一些肘部潤滑脂，它什么也沒得到。

let text = "This is the"
let attr = NSMutableAttributedString(string: "\(text) button's text!")
attr.addAttribute(NSFontAttributeName, value: UIFont.boldSystemFontOfSize(14), range: NSMakeRange(0, text.characters.count))
cell.nameLabel.setAttributedTitle(attr, forState: UIControlState.Normal)

// "**This is the** button's text!"

Answer 2

Swift 4版本的chicobermuda的答案 ：

let text = "This is the"
let attr = NSMutableAttributedString(string: "\(text) button's text!")
attr.addAttribute(NSAttributedStringKey.font, value: UIFont.boldSystemFont(ofSize: 14), range: NSMakeRange(0, text.count))
cell.nameLabel.setAttributedTitle(attr, forState: .normal)

// "**This is the** button's text!"

它工作正常