UITextView更改特定文本的文本颜色 [英] UITextView change text color of specific text

问题描述

我想更改与数组索引匹配的UITextView中特定文本的文本颜色.我能够对此 answer 进行一些修改，但不幸的是，每个匹配短语的文本颜色仅更改了一次.

I want to change the text color of a specific text within a UITextView which matches an index of an array. I was able to slightly modify this answer but unfortunatly the text color of each matching phrase is only changed once.

var chordsArray = ["Cmaj", "Bbmaj7"]
func getColoredText(textView: UITextView) -> NSMutableAttributedString {
    let text = textView.text
    let string:NSMutableAttributedString = NSMutableAttributedString(string: text)
    let words:[String] = text.componentsSeparatedByString(" ")
    for word in words {
        if (chordsArray.contains(word)) {
            let range:NSRange = (string.string as NSString).rangeOfString(word)
            string.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: range)
        }
    }
    chords.attributedText = string
    return string
}

结果

推荐答案

对不起，我刚刚注意到您的消息.这是一个工作示例(在操场上测试):

Sorry, I just noticed your message. Here is a working example (tested in a playground):

import UIKit


func apply (string: NSMutableAttributedString, word: String) -> NSMutableAttributedString {
    let range = (string.string as NSString).rangeOfString(word)
    return apply(string, word: word, range: range, last: range)
}

func apply (string: NSMutableAttributedString, word: String, range: NSRange, last: NSRange) -> NSMutableAttributedString {
    if range.location != NSNotFound {
        string.addAttribute(NSForegroundColorAttributeName, value: UIColor.redColor(), range: range)
        let start = last.location + last.length
        let end = string.string.characters.count - start
        let stringRange = NSRange(location: start, length: end)
        let newRange = (string.string as NSString).rangeOfString(word, options: [], range: stringRange)
        apply(string, word: word, range: newRange, last: range)
    }
    return string
}

var chordsArray = ["Cmaj", "Bbmaj7"]
var text = "Cmaj Bbmaj7 I Love Swift Cmaj Bbmaj7 Swift"
var newText = NSMutableAttributedString(string: text)

for word in chordsArray {
    newText = apply(newText, word: word)
}

newText

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