UITextView 更改特定文本的文本颜色

Question

我想更改与数组索引匹配的 UITextView 中特定文本的文本颜色。我能够稍微修改这个答案，但不幸的是，每个匹配短语的文本颜色只更改一次。

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

Answer 1

万一有人在 swift 4 中需要它。这是我从 Xcode 9 playground 得到的：）。

import UIKit
import PlaygroundSupport
class MyViewController : UIViewController
{
    override func loadView()
    {
        let view = UIView()
        view.backgroundColor = .white

        let textView = UITextView()
        textView.frame = CGRect(x: 150, y: 200, width: 200, height: 20)
        textView.text = "@Kam @Jam @Tam @Ham"
        textView.textColor = .black
        view.addSubview(textView)
        self.view = view

        let query = "@"

        if let str = textView.text {
            let text = NSMutableAttributedString(string: str)
            var searchRange = str.startIndex..<str.endIndex
            while let range = str.range(of: query, options: NSString.CompareOptions.caseInsensitive, range: searchRange) {
                text.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.gray, range: NSRange(range, in: str))
                searchRange = range.upperBound..<searchRange.upperBound
            }
            textView.attributedText = text
        }
    }
}
PlaygroundPage.current.liveView = MyViewController()

我认为对于 swift 3，您需要像这样手动将 Range(String.Index) 转换为 NSRange。

 let start = str.distance(from: str.startIndex, to: range.lowerBound)
 let len = str.distance(from: range.lowerBound, to: range.upperBound)
 let nsrange = NSMakeRange(start, len)
 text.addAttribute(NSAttributedStringKey.foregroundColor, value: UIColor.gray, range: nsrange)