Swift3 Swift 3：如何将属性应用于字符串的各个部分

因此，我在Swift 2中使用的方法不再有效，因为Swift 3在字符串索引和范围方面发生了变化。以前我有

func configureLabel(defaultColor: UIColor, highlightColor: UIColor, boldKeyText: Bool) {
    if let index = self.text?.characters.indexOf(Character("|")) {
        self.text = self.text!.stringByReplacingOccurrencesOfString("|", withString: "")
        let labelLength:Int = Int(String(index))! // Now returns nil

        var keyAttr: [String:AnyObject] = [NSForegroundColorAttributeName: highlightColor]
        var valAttr: [String:AnyObject] = [NSForegroundColorAttributeName: defaultColor]
        if boldKeyText {
            keyAttr[NSFontAttributeName] = UIFont.systemFontOfSize(self.font.pointSize)
            valAttr[NSFontAttributeName] = UIFont.systemFontOfSize(self.font.pointSize, weight: UIFontWeightHeavy)
        }

        let attributeString = NSMutableAttributedString(string: self.text!)
        attributeString.addAttributes(keyAttr, range: NSRange(location: 0, length: (self.text?.characters.count)!))
        attributeString.addAttributes(valAttr, range: NSRange(location: 0, length: labelLength))

        self.attributedText = attributeString

    }
}

---

基本上，我可以使用像“First Name:| Gary Oak”这样的字符串，让|字符前后的所有部分使用不同的颜色，或者将部分字符加粗，但我上面评论的行不再返回值，这会破坏后面的所有内容。关于如何做到这一点，您有什么想法吗？

在Swift 3中，您可以使用以下内容：

func configureLabel(defaultColor: UIColor, highlightColor: UIColor, boldKeyText: Bool) {      

    if let index = self.text?.characters.index(of: Character("|")) {
        self.text = self.text!.replacingOccurrences(of: "|", with: "")
        let position = text.distance(from: text.startIndex, to: index)

        let labelLength:Int = Int(String(describing: position))!

        var keyAttr: [String:AnyObject] = [NSForegroundColorAttributeName: defaultColor]
        var valAttr: [String:AnyObject] = [NSForegroundColorAttributeName: highlightColor]
        if boldKeyText {
            keyAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: self.font.pointSize)
            valAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: self.font.pointSize, weight: UIFontWeightHeavy)
        }

        let attributeString = NSMutableAttributedString(string: self.text!)
        attributeString.addAttributes(keyAttr, range: NSRange(location: 0, length: (self.text?.characters.count)!))
        attributeString.addAttributes(valAttr, range: NSRange(location: 0, length: labelLength))

        self.attributedText = attributeString

    }

}

---

使用

let position=text.distance（from:text.startIndex，to:index）

得到的不是字符串位置的整数表示，而是字符串索引值。使用

text.distance（从：text.startIndex，到：index）

您可以在Swift 3中找到字符串索引的int位置

func configureLabel(defaultColor: UIColor, highlightColor: UIColor, boldKeyText: Bool) {      

    if let index = self.text?.characters.index(of: Character("|")) {
        self.text = self.text!.replacingOccurrences(of: "|", with: "")
        let position = text.distance(from: text.startIndex, to: index)

        let labelLength:Int = Int(String(describing: position))!

        var keyAttr: [String:AnyObject] = [NSForegroundColorAttributeName: defaultColor]
        var valAttr: [String:AnyObject] = [NSForegroundColorAttributeName: highlightColor]
        if boldKeyText {
            keyAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: self.font.pointSize)
            valAttr[NSFontAttributeName] = UIFont.systemFont(ofSize: self.font.pointSize, weight: UIFontWeightHeavy)
        }

        let attributeString = NSMutableAttributedString(string: self.text!)
        attributeString.addAttributes(keyAttr, range: NSRange(location: 0, length: (self.text?.characters.count)!))
        attributeString.addAttributes(valAttr, range: NSRange(location: 0, length: labelLength))

        self.attributedText = attributeString

    }

}

使用

let position=text.distance（from:text.startIndex，to:index）

得到的不是字符串位置的整数表示，而是字符串索引值。使用

text.distance（从：text.startIndex到：index）

可以找到字符串索引的int位置