SWIFT: BRIDGE and objective-C function From http://stackoverflow.com/questions/24006549/calling-nsstring-method-on-a-string-in-swift

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Swift automatically bridges between the String type and the NSString class. This means that anywhere you use an NSString object, you can use a Swift String type instead and gain the benefits of both types  But it appears that only some of NSString's functions are accessible without explicitly bridging. To bridge to an NSString and use any of its functions, the following methods work:   //Example Swift String var     var newString:String = "this is a string"      //Bridging to NSString     //1     (newString as NSString).containsString("string")     //2     newString.bridgeToObjectiveC().containsString("string")     //3     NSString(string: newString).containsString("string") All three of these work. It's interesting to see that only some NSString methods are available to Strings and others need explicit bridging. This may be something that is built upon as Swift develops.  share|improve this answer edited Jun 4 '14 at 3:08  answered Jun 3 '14 at 4:56  Jpoliachik 411313 add a comment  up vote 2 down vote So what you actually have to do is this  var str:NSString = "Checkcontains" str.containsString("ckc")