nsstring - .containsString in Swift 2? -

previously, when wanted see if swift string contained string, cast nsstring , call .containsstring. apple, in infinite wisdom, made version-aware, if try under s2 demand #available wrapper if target platform support (which guess bug).

so best solution appears this:

extension string {     func contains(substr: string) -> bool {         if #available(osx 10.10, *) {             return nsstring(string: self).containsstring(substr)         } else {             return self.rangeofstring(substr) != nil         }     } } 

and check it, instead of this:

if nsstring(string: line).containsstring(" ")... 

you use nicer looking:

if line.contains(" ")... 

this no longer complains version, , (imho) looks better too. want too:

extension string {     var length: int {         return self.characters.count     } } 

apple keeps changing way length, , hope future changes api #available-able, @ point .length can modified. , these sanity:

extension string {     subscript (r: range<int>) -> string {         {             let substart = advance(self.startindex, r.startindex, self.endindex)             let subend = advance(substart, r.endindex - r.startindex, self.endindex)             return self.substringwithrange(range(start: substart, end: subend))         }     }     func substring(from: int) -> string {         let end = self.characters.count         return self[from..<end]     }     func substring(from: int, length: int) -> string {         let end = + length         return self[from..<end]     } }  extension string {     func trim() -> string {         return self.stringbytrimmingcharactersinset(nscharacterset.whitespaceandnewlinecharacterset())     }     func trim(withset: nscharacterset) -> string {         return self.stringbytrimmingcharactersinset(withset)     } }