UITextView 使用 swift 突出显示所有匹配项 [英] UITextView highlight all matches using swift

问题描述

我想通过搜索突出显示所有匹配的单词.我写了代码，但我不能使用循环.当我搜索一个单词时，我的应用程序会查找单词并仅突出显示第一个单词.这是我的代码

I want to highlight all matches word with searching. I wrote code but I couldn't use a loop. When i search a word, my app find words and highlight only first word. here is my code

var count = 0
let attributedText = NSMutableAttributedString(attributedString: txtMetin2.attributedText)
let text2 = txtArama.text as NSString
let text = txtMetin2.text as NSString
var range:NSRange
var checker:NSString = ""

for(var i=0 ; i<text.length - text2.length-1 ; i++)
{        
    range = NSMakeRange(i, text2.length)
    checker = text.substringWithRange(range)
    if(text2 == checker)
    {
        count++    
        let highlightedRange = text.rangeOfString("\(text2)")
        attributedText.addAttribute(NSBackgroundColorAttributeName, value: UIColor.blueColor(), range: highlightedRange)
        let textAttachment = NSTextAttachment()
        let textAttachmentString = NSAttributedString(attachment: textAttachment)
        attributedText.appendAttributedString(textAttachmentString)
        txtMetin2.attributedText = attributedText                               
    }
}
println("\(count)")

我是 swift 的新手.抱歉糟糕的编码.我的代码找到匹配计数但我如何突出显示所有匹配谢谢

i am very new at swift. sorry for bad coding. my codes find matches count but how can i highlight all matches thank you

推荐答案

Obligatory 基于 NSRegularExpression 的解决方案.

Obligatory NSRegularExpression based solution.

let searchString = "this"
let baseString = "This is some string that contains the word \"this\" more than once. This substring has multiple cases. ThisthisThIs."

let attributed = NSMutableAttributedString(string: baseString)

var error: NSError?
let regex = NSRegularExpression(pattern: searchString, options: .CaseInsensitive, error: &error)

if let regexError = error {
    println("Oh no! \(regexError)")
} else {
    for match in regex?.matchesInString(baseString, options: NSMatchingOptions.allZeros, range: NSRange(location: 0, length: baseString.utf16Count)) as [NSTextCheckingResult] {
        attributed.addAttribute(NSBackgroundColorAttributeName, value: UIColor.yellowColor(), range: match.range)
    }

    textView.attributedText = attributed
}

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