I have a function:
func IphoneName() -> String { let device = UIDevice.currentDevice().name return device } Which returns the name of the iPhone (simple). I need to remove the "'s Iphone" from the end. I have been reading about changing it to NSString and use ranges, but I am a bit lost!
What about this:
extension String { func removeCharsFromEnd(count:Int) -> String{ let stringLength = countElements(self) let substringIndex = (stringLength < count) ? 0 : stringLength - count return self.substringToIndex(advance(self.startIndex, substringIndex)) } func length() -> Int { return countElements(self) } } Test:
var deviceName:String = "Mike's Iphone" let newName = deviceName.removeCharsFromEnd("'s Iphone".length()) // Mike But if you want replace method use stringByReplacingOccurrencesOfString as @Kirsteins posted:
let newName2 = deviceName.stringByReplacingOccurrencesOfString( "'s Iphone", withString: "", options: .allZeros, // or just nil range: nil) You don't have to work with ranges in this case. You can use:
var device = UIDevice.currentDevice().name device = device.stringByReplacingOccurrencesOfString("s Iphone", withString: "", options: .allZeros, range: nil) In Swift3:
var device = UIDevice.currentDevice().name device = device.replacingOccurrencesOfString("s Iphone", withString: "") 
Swift 4 Code
//Add String extension
extension String { func removeCharsFromEnd(count:Int) -> String{ let stringLength = self.count let substringIndex = (stringLength < count) ? 0 : stringLength - count let index: String.Index = self.index(self.startIndex, offsetBy: substringIndex) return String(self[..<index]) } func length() -> Int { return self.count } } //Use string function like
let deviceName:String = "Mike's Iphone" let newName = deviceName.removeCharsFromEnd(count: "'s Iphone".length()) print(newName)// Mike 