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【Swift+Extension】Swift.RangeとNSRangeの変換

Last updated at Posted at 2018-03-14

String extension

String+Range.swift
import Foundation

extension String {

    func nsRange(from range: Range<String.Index>) -> NSRange {
        return NSRange(range, in: self)
    }

    func ranges(of searchString: String, options mask: NSString.CompareOptions = [], locale: Locale? = nil) -> [Range<String.Index>] {
        var ranges: [Range<String.Index>] = []
        while let range = range(of: searchString, options: mask, range: (ranges.last?.upperBound ?? startIndex)..<endIndex, locale: locale) {
            ranges.append(range)
        }
        return ranges
    }

    func nsRanges(of searchString: String, options mask: NSString.CompareOptions = [], locale: Locale? = nil) -> [NSRange] {
        let ranges = self.ranges(of: searchString, options: mask, locale: locale)
        return ranges.map { nsRange(from: $0) }
    }

}

FYI

NSString - Foundation | Apple Developer Documentation
Searching, Comparing, and Sorting Strings | Apple Developer Documentation

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