Removing characters from a string in Swift

Question

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 " Iphone" from the end. I read about changing it to NSString and using ranges, but I got a little confused!

Answer 1

How 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) } } 

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Test:

 var deviceName:String = "Mike Iphone" let newName = deviceName.removeCharsFromEnd(" Iphone".length()) // Mike 

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But if you want the replace method to use stringByReplacingOccurrencesOfString as @Kirsteins :

 let newName2 = deviceName.stringByReplacingOccurrencesOfString( " Iphone", withString: "", options: .allZeros, // or just nil range: nil) 

Answer 2

In this case, you do not need to work with ranges. You can use:

 var device = UIDevice.currentDevice().name device = device.stringByReplacingOccurrencesOfString("s Iphone", withString: "", options: .allZeros, range: nil) 

Answer 3

In Swift3:

 var device = UIDevice.currentDevice().name device = device.replacingOccurrencesOfString("s Iphone", withString: "") 

Answer 4

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 the string function as

 let deviceName:String = "Mike Iphone" let newName = deviceName.removeCharsFromEnd(count: " Iphone".length()) print(newName)// Mike