Question

我的应用中有一些搜索选项，会在keytool中突出显示给定的字词。鉴于单词可能在标签中出现多次，我需要突出显示所有这些单词。怎么可能，我尝试了一些代码但它只会突出显示该单词的一次，这是我的示例代码：

UISearchBar

需要同时支持var SearchAttributeText = "The" let range = (TextValue as NSString).range(of: SearchAttributeText) let attribute = NSMutableAttributedString.init(string: TextValue) attribute.addAttribute(NSForegroundColorAttributeName, value: UIColor.red , range: range) self.label.attributedText = attribute和Upper个案例。单词lower可能会多次出现，需要突出显示所有内容。

Answer 1

您可以使用以下代码搜索字符串

    //Text need to be searched
    let SearchAttributeText = "the"

    //Store label text in variable as NSString
    let contentString = lblContent.text! as NSString

    //Create range of label text
    var rangeString = NSMakeRange(0, contentString.length)

    //Convert label text into attributed string
    let attribute = NSMutableAttributedString.init(string: contentString as String)

    while (rangeString.length != NSNotFound && rangeString.location != NSNotFound) {

        //Get the range of search text
        let colorRange = (lblContent.text?.lowercased() as! NSString).range(of: SearchAttributeText, options: NSString.CompareOptions(rawValue: 0), range: rangeString)

        if (colorRange.location == NSNotFound) {
            //If location is not present in the string the loop will break
            break
        } else {
            //This line of code colour the searched text
            attribute.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.red , range: colorRange)
            lblContent.attributedText = attribute

            //This line of code increment the rangeString variable
            rangeString = NSMakeRange(colorRange.location + colorRange.length, contentString.length - (colorRange.location + colorRange.length))
        }
    }

以下代码行通过递增location

的length和NSRange参数来更新范围

rangeString = NSMakeRange(colorRange.location + colorRange.length, contentString.length - (colorRange.location + colorRange.length))

iOS Swift以编程方式更改标签内的特定文本颜色

1 个答案: