Common use cases like printing JSON or optionals can make developing in Swift an even better experience. Custom String interpolation. And I want to display which input(s) is used to compute the result in a detailed label of a table view cell. Question or problem in the Swift programming language: I can read an int, float, double as a string using string interpolation or String initializer. extension String. However I saw a comment in the code example in the SE saying that we shouldn’t call `appendLiteral` method directly but I see you call it in your appendInterpolation method implementation. As a general note, there is an important difference between string interpolation vs the Printable protocol. result is always the same. Swift 3 incorrect string interpolation with implicitly unwrapped Optionals. Creating a custom string becomes easy with string interpolation. Overview. I'll show you a working example real quick. Why 'if let' does not seem to unbox a value as before in Swift 3 in Xcode 8.3 beta?-1. "as My String into a series of statements similar to: In Swift, types need to conform to the CustomStringConvertible protocol in order to be used inside strings. The Swift equivalent to what you're describing is string interpolation. String Interpolation in Swift. The main idea here is that you can create your own custom interpolation methods to format strings. String interpolation is a way to construct new strings that contain constants, variables, literals, and expressions. 0. Each entry of the string literal you inserted is wrapped in parentheses prefixed by a backslash: let x = 3 let str = "\\(x) * 5 = \\(Double(x) * 5)" print(str) Below is above code execution result. Swift String interpolation in 5 minutes : Interpolation is the process to insert variables, constants, expressions, and literals into a string. For example ... You can use %@ in Swift's String(format:...), it can be substituted by a Swift String or any instance of a NSObject subclass. Follow. 13. I posted this post on our local iOS developer FB group. Steven Curtis. It works with both single line and multiline strings. Custom string interpolation allows you to further optimize working with strings in Swift. 3 * … Swift String Interpolation Example Read More » My app is kind of related to maths. This is also a requirement for the types used in string interpolation like this: "Integer value \(intVal) and double value \(doubleVal)" Check if variable is an Optional, and what type it wraps. This is a more advanced topic, but I believe that not so many people are aware of this function in Swift, so let's talk a little bit about it. var a: Int = 2 var c: Character = "e" var d: String = "\(a)\(c)" OR var d: String = String(a) + String(c) the … Great blog post about a simple example for the new String Interpolation use cases in Swift 5. 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