Swift Tutorial - Swift Nested Types

We can nest other types in our type definitions.

Example

The following code creates a Person with nested class.

class Person {
    var health = Health()

    class Health {
        var pulse:Int = 100
        var bmi:Int = 20

        func profile() -> String {
            return "Pulse:\(self.pulse), BMI:\(self.bmi)"
        }
    }
}
let p = Person()
p.health.profile()

Example 2

The following code shows how to nested Structures

struct Shapes {
    struct Line {
        var x:Int = 0
        var y:Int = 0
        var length:Int = 0
    }

    struct Rectangle {
        var x:Int = 0
        var y:Int = 0
        var width:Int = 0
        var height:Int = 0
        var area:Int = 0
    }

    struct Circle {
        let pi:Float = 3.1415
        var radius:Float = 0.0
    }
    
}

var c = Shapes.Circle()
c.radius = 45.0