ios - 更改了子字符串的颜色，但字体设置已重置

Question

How to change color of text stirngs inside UITextView in Swift3

我尝试像这样引用上面的网址来更改子字符串的颜色。

func textViewDidChange(_ textView: UITextView, pageIndex: Int) {
    let attrStr = NSMutableAttributedString(string: textView.text)
    let inputLength = attrStr.string.characters.count
    let searchString = self.emphasisingWordList[pageIndex]
    let searchLength = searchString.characters.count
    var range = NSRange(location: 0, length: attrStr.length)

    while (range.location != NSNotFound) {
        range = (attrStr.string as NSString).range(of: searchString, options: [], range: range)
        if (range.location != NSNotFound) {
            attrStr.addAttribute(NSForegroundColorAttributeName, value: UIColor.orange, range: NSRange(location: range.location, length: searchLength))
            range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
            textView.attributedText = attrStr
        }
    }
}

但是，我发现设置属性文本时，字体大小和颜色会重置为默认值(黑色)。

我在代码末尾添加了这些行，但当然整个字符串都会受到影响。

self.sloganTextView.font = UIFont.systemFont(ofSize: 35)
self.sloganTextView.textColor = UIColor.white

有什么好的解决办法还是必须把每个属性颜色都一一改掉？

正如很多人已经提到的，selectable 设置为 true。

Answer 1

您可以尝试以下代码:

var strName: String = "ABC"
var strTitle: String = "XYZ"
let commentString = NSMutableAttributedString(string: strTitle + " \(strName)")
commentString.addAttribute(NSForegroundColorAttributeName, value: UIColor.blue, range: NSRange(location: 0, length: (strTitle.characters.count )))
commentString.addAttribute(NSForegroundColorAttributeName, value: UIColor.orange, range: NSRange(location: (strTitle.characters.count ), length: (strName.characters.count ) + 1))
self.txtView.attributedText = commentString

希望这段代码对您有帮助。