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iOS Object-Oriented Swift Inheritance Overriding Methods

Steve Pham
Steve Pham
1,488 Points

Our RoundButton class should have its own implementation of the incrementBy method. Override the incrementBy method in t

i need help.Tks

Button.swift
class Button {
  var width: Double
  var height: Double

  init(width:Double, height:Double){
    self.width = width
    self.height = height
  }

  func incrementBy(points: Double){
    width += points
    height += points
  }
}

class RoundButton: Button {
  var cornerRadius: Double = 5.0
}

1 Answer

William Li
PLUS
William Li
Courses Plus Student 26,868 Points

This problem is asking you to overwrite the incrementBy method in from its super class, there're couple things you need to do

  1. you need the override keyword
  2. the new incrementBy method should have default the points parameter to 7.0.
class RoundButton: Button {
  var cornerRadius: Double = 5.0
  override func incrementBy(_ points: Double = 7.0){
    width += points
    height += points
  }
}

Review Amit Bijlani 's lecture if you need refresh on the topic.