How to automatically create an initializer for a Swift class?

Update As of Xcode 11.4

You can refactor (right-click mouse menu) to generate the memberwise initializer for class and struct.

Note that struct automatic initializers are internal. You may want to generate memberwise initializer when defining a module to make it public.

Right-click > Refactor > 'Generate Memberwise Initializer'

For older Xcode

There are handy plugins:

https://github.com/rjoudrey/swift-init-generator https://github.com/Bouke/SwiftInitializerGenerator

Given the following class (or for structs if temporarily change the keyword struct to class and after refactor set back to struct):

class MyClass {
    let myIntProperty: Int
    let myStringProperty: String
    let myOptionalStringProperty: String?
    let myForcedUnwrappedOptionalStringProperty: String!
}

Go to Xcode and:

1. Double click the class name
2. Right click
3. Refactor
4. Generate Member-wise Initializer

Above steps look like this:

Just a tiny second later, Xcode generates this initializer:

internal init(myIntProperty: Int, myStringProperty: String, myOptionalStringProperty: String?, myForcedUnwrappedOptionalStringProperty: String?) {
    self.myIntProperty = myIntProperty
    self.myStringProperty = myStringProperty
    self.myOptionalStringProperty = myOptionalStringProperty
    self.myForcedUnwrappedOptionalStringProperty = myForcedUnwrappedOptionalStringProperty
}

No, there is no such feature for classes. But, if you design this as a struct, you get an memberwise initializer for free — assuming you don't define others initializers yourself.

For instance:

struct Point {
    var x: Float
    var y: Float
}
...
var p = Point(x: 1, y: 2)

From The Swift Programming Language book:

Structure types automatically receive a memberwise initializer if they do not define any of their own custom initializers. Unlike a default initializer, the structure receives a memberwise initializer even if it has stored properties that do not have default values.

The memberwise initializer is a shorthand way to initialize the member properties of new structure instances. Initial values for the properties of the new instance can be passed to the memberwise initializer by name.