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Swift：
Sting没有length方法，获取字符串长度使用count；
OC:
NSString使用.length获取长度；
场景：在存在emoji的的字符串下，Swift和OC混编时候如果用count取，导致匹配长度不够；
* NSString是由UTF-16单元构成
* length方法返回的是基于UTF-16的长度
* Swift的count返回的只是Unicode字符个数
结论： Swift的utf16.count是对应NSString的.length方法
private func allRangeOf(searchString: String, from: String) -> [NSRange] { let
scanner= Scanner(string: from) scanner.caseSensitive = true scanner.
charactersToBeSkipped= CharacterSet(charactersIn: "") scanner.scanLocation = 0
var rangeArray: [NSRange] = [] while !scanner.isAtEnd { if scanner.scanString(
searchString, into: nil) { let location = scanner.scanLocation - searchString.
lengthlet range = NSRange(location: location, length: searchString.length)
rangeArray.append(range) } else { scanner.scanLocation += 1 } } return
rangeArray}
