Finding new line character in a String in "Swift 3"

Question

In my app I am receiving some incoming data from a web service. In that data some wrong values can also be received like new line characters. I want to find in response string that if it contains a new line character or not.

Before Swift 3 I was able to do it like this

string.rangeOfString("\n")) == nil)

But in Swift 3 this methods is no longer available. However substring method is available which does with the help of Range.

I want to detect if my string contains "\n" how this would be accomplished using this method in Swift 3.

Answer 1

Short answer for Swift 5+

You can use

string.contains { $0.isNewline }

or KeyPath based syntax

string.contains(where: \.isNewline)

to detect if string contains any newline character.

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Long answer

Swift 5 introduced couple of new properties on Character. Those simplify such tests and are more robust then simple check for \n.

Now you can use

myCharacter.isNewline

For complete list check Inspecting a Character section in Character docs

Example:

Character("\n").isNewline // true
Character("\r").isNewline // true
Character("a").isNewline  // false

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