extension String {
func toNSRange(_ range: Range<String.Index>) -> NSRange {
guard let from = range.lowerBound.samePosition(in: utf16), let to = range.upperBound.samePosition(in: utf16) else {
return NSMakeRange(0, 0)
}
return NSMakeRange(utf16.distance(from: utf16.startIndex, to: from), utf16.distance(from: from, to: to))
}
func toRange(_ range: NSRange) -> Range<String.Index>? {
guard let from16 = utf16.index(utf16.startIndex, offsetBy: range.location, limitedBy: utf16.endIndex) else {
return nil
}
guard let to16 = utf16.index(from16, offsetBy: range.length, limitedBy: utf16.endIndex) else { return nil }
guard let from = String.Index(from16, within: self) else {
return nil
}
guard let to = String.Index(to16, within: self) else {
return nil
}
return from ..< to
}
}
Swift之NSRange和Range相互转换
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转载自blog.csdn.net/Forever_wj/article/details/108270832
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