我正在尝试创建一个函数,该函数将使输入字符串的某些单词带有颜色,然后该函数将不会返回带有颜色的字符串。
我首先从红色开始,但不知道如何使它起作用。
到目前为止,我的代码:
let oldString = "TEST STRING TO COLOUR IT WORDS EXIST" //sample of a variable string that may or may not contain wors that need coloring
let newString = stringColorCoding(stringToColor: oldString, colorRed: "TO, POT, TEST", colorYellow: "EXIST, TOP", colorGreen: "AB, +TA, -XY, WORDS")
func stringColorCoding(stringToColor: String, colorRed: String, colorYellow: String, colorGreen: String)
{
let attrStr = NSMutableAttributedString(string: stringToColor)
let inputLength = attrStr.string.count
let searchStringRed = colorRed
let searchLengthRed = searchStringRed.characters.count
var rangeRed = NSRange(location: 0, length: attrStr.length)
while (range.location != NSNotFound)
{
range = (attrStr.string as NSString).range(of: searchStringRed, options: [], range: range)
if (range.location != NSNotFound)
{
attrStr.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemRed, range: NSRange(location: range.location, length: searchLengthRed))
range = NSRange(location: range.location + range.length, length: inputLength - (range.location + range.length))
}
}
return attrStr
}
答案 0 :(得分:0)
它的处理方式非常复杂。我会使用enumerateSubstrings
来获取字符串中的每个单词。然后,我不传递带有搜索词的逗号分隔字符串,而是传递一个搜索字符串数组。
extension String {
func highlighted(
redText: [String],
yellowText: [String],
greenText: [String]
) -> NSAttributedString {
let result = NSMutableAttributedString(string: self)
enumerateSubstrings(in: startIndex..<endIndex, options: .byWords) {
(substring, substringRange, _, _) in
guard let substring = substring else { return }
if redText.contains(substring) {
result.addAttribute(
.foregroundColor,
value: UIColor.systemRed,
range: NSRange(substringRange, in: self)
)
}
if yellowText.contains(substring) {
result.addAttribute(
.foregroundColor,
value: UIColor.systemYellow,
range: NSRange(substringRange, in: self)
)
}
if greenText.contains(substring) {
result.addAttribute(
.foregroundColor,
value: UIColor.systemGreen,
range: NSRange(substringRange, in: self)
)
}
}
return result
}
}
用法如下:
let highlighted = "TEST TO COLOUR IT WORDS EXIST".highlighted(
redText: ["TO", "POT", "TEST"],
yellowText: ["EXIST", "TOP"],
greenText: ["AB", "+TA", "-XY", "WORDS"]
)