在swift中为所有出现的字符串着色

Question

这段代码

var textSearch="hi"
var textToShow="hi hihi hi" 
var rangeToColor = (textToShow as NSString).rangeOfString(textSearch)
var attributedString = NSMutableAttributedString(string:textToShow)
attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.yellowColor() , range: rangeToColor)
TextView.attributedText=attributedString

给我NSRange为TextView中的字符串着色.问题是我只返回第一次出现.如果单词包含"hi hihi hi",则仅第一个"hi"被着色.如何获取所有出现的字符串？

Answer 1

斯威夫特3

let attrStr = NSMutableAttributedString(string: "hi hihi hey")
let inputLength = attrStr.string.characters.count
let searchString = "hi"
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.yellow(), range: NSRange(location: range.location, length: searchLength))
        range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
    }
}

斯威夫特2

let attrStr = NSMutableAttributedString(string: "hi hihi hey")
let inputLength = attrStr.string.characters.count
let searchString = "hi"
let searchLength = searchString.characters.count
var range = NSRange(location: 0, length: attrStr.length)

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

Answer 2

斯威夫特4：

let string = "foo fbar foofoo foofo"
let mutableAttributedString = NSMutableAttributedString(string: string)
let searchString = "foo"
var rangeToSearch = string.startIndex..<string.endIndex
while let matchingRange = string.range(of: searchString, options: [], range: rangeToSearch) {
  mutableAttributedString.addAttribute(.foregroundColor, value: UIColor.yellow, range: NSRange(matchingRange, in: string))
  rangeToSearch = matchingRange.upperBound..<string.endIndex
}