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Last active August 9, 2017 11:43
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Swift ensures that all properties of a derived class are initialised before calling its base class. The compiler will generate a warning. Just move the statement below the assignment to remove the warning. Compared to Java, this is safe. See: http://stackoverflow.com/questions/3404301/whats-wrong-with-overridable-method-calls-in-constructors
import Cocoa
class Plane
{
init()
{
readyToTakeOff();
}
func readyToTakeOff(){
}
}
class HighSpeedPlane : Plane
{
var speed : Int
init(speed: Int) {
super.init() //compiler warning: "Property 'self.speed' not initialized at super.init call"
self.speed = speed
}
override func readyToTakeOff()
{
super.readyToTakeOff()
println("Travelling at the speed of \(self.speed)")
}
}
let plane = HighSpeedPlane(speed: 200);
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