Question

我可以;突出显示一个子串。这就是我所做的（是一个＆＃34;重复＆＃34;问题）：

以下是我需要将其投射到 NSRange

的地方

for user in tweet.userMentions
{          
    let userName = user.keyword
    if let startIndex = tweetTextLabel.text?.rangeOfString("@")?.startIndex
    {
        let range = startIndex...userName.endIndex
        var atrString = NSMutableAttributedString(string:tweetTextLabel.text!)
        atrString.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: range as? NSRange)
        tweetTextLabel.attributedText = atrString
    }
}

我该怎么办？也许那里有另一个快速的功能我使用的是swift 1.1，iOS 8.1 SDK

更新仍然没有高调文本

 for user in tweet.userMentions{

                let text = tweetTextLabel.text!
                let nsText = text as NSString
                let textRange = NSMakeRange(0, nsText.length)
                let attributedString = NSMutableAttributedString(string: nsText)

                nsText.enumerateSubstringsInRange(textRange, options: NSStringEnumerationOptions.ByWords, { (substring, substringRange, enclosingRange, stop) -> () in

                    if (substring == user.keyword) {
                        attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.blueColor(), range: substringRange)
                        println(substring)
                    }
                })
                tweetTextLabel.attributedText = attributedString
                println(attributedString)

另一次更新 所以在我更新代码的地方仍然没有为子字符串着色我正在做一个突出显示颜色主题标签，网址和用户屏幕名称的推特应用

Answer 1

我不太明白你要做什么，但这里有一个模特供你工作：

let s = "Eat @my shorts" as NSString
var att = NSMutableAttributedString(string: s as String)
let r = s.rangeOfString("@\\w.*?\\b", options: .RegularExpressionSearch, range: NSMakeRange(0,s.length))
if r.length > 0 {
    att.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: r)
}

这给出了一个属性字符串“Eat @my shorts”，其中“@my”这个词是红色的。

enter image description here

希望提供线索......

Answer 2

迅速找到此扩展名：

extension UILabel {

    func highlight(searchedText: String?, color: UIColor = .red) {
        guard let txtLabel = self.text?.lowercased(), let searchedText = searchedText?.lowercased() else {
            return
        }

        let attributeTxt = NSMutableAttributedString(string: txtLabel)
        let range: NSRange = attributeTxt.mutableString.range(of: searchedText, options: .caseInsensitive)

        attributeTxt.addAttribute(NSAttributedString.Key.foregroundColor, value: color, range: range)

        self.attributedText = attributeTxt
    }

}

Answer 3

Swift5 版本适用于字体和颜色

extension UILabel {
    func highlight(text: String?, font: UIFont? = nil, color: UIColor? = nil) {
        guard let fullText = self.text, let target = text else {
            return
        }

        let attribText = NSMutableAttributedString(string: fullText)
        let range: NSRange = attribText.mutableString.range(of: target, options: .caseInsensitive)
        
        var attributes: [NSAttributedString.Key: Any] = [:]
        if let font = font {
            attributes[.font] = font
        }
        if let color = color {
            attributes[.foregroundColor] = color
        }
        attribText.addAttributes(attributes, range: range)
        self.attributedText = attribText
    }
}

Answer 4

更新@ matt的好答案，Swift 4：

 let s = "Eat @my shorts" as NSString
 let att = NSMutableAttributedString(string: s as String)
 let r = s.range(of: "@\\w.*?\\b", options: .regularExpression, range: NSMakeRange(0,s.length))
    if r.length > 0 { att.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red, range: r)
        }

突出显示UILabel中的子字符串

4 个答案: