도래울

var string = "hello Swift" if string.rangeOfString("Swift") != nil{ println("exists") } // alternative: not case sensitive if string.lowercaseString.rangeOfString("swift") != nil { println("exists") }

let aString: String = "This is my string" let newString = aString.stringByReplacingOccurrencesOfString(" ", withString: "+", options: NSStringCompareOptions.LiteralSearch, range: nil)And as noted by @cprcrack below, the options and range parameters are optional, so if you don't want to specify string comparison options or a range to do the replacement within, you only need the following.let aStr..