🤑 Join the Treehouse affiliate program and earn 25% recurring commission!

New No-Code Track! 🚀start learning today!

🌟 Dreaming of a bright future? 🎓 Ask about the Treehouse Scholarship program! 🚀

✨ Earn college credits in Cybersecurity, JS, HTML, CSS and Python

  • Treehouse Logo
  • Plans
    Chevron
    • For Individuals
    • For Businesses
    • For Schools
    • For Libraries
    • For Military
  • Library
    Chevron
    • All Courses
    • Tracks
    • College Credit
  • Techdegree
    Chevron
    • Overview
    • Front End Development
    • Full Stack JavaScript
    • Data Analysis
    • UX Design
    • Python
  • Community
    Chevron
    • Code Adventures
    • Discord
    • Forum
    • Success Stories
    • Treehouse Links
    • 100 Days of Code
  • Resources
    Chevron
    • Career Toolbox
    • CodeForward
    • Free Treehouse Near Me
    • Jobs
    • Blog
    • Support
    • About
  • For Individuals For Businesses For Schools For Libraries For Military
  • All Courses Tracks College Credit
  • Overview Front End Web Development Full Stack JavaScript Python Development Data Analysis UX Design
  • Code Adventures Discord Forum Success Stories Treehouse Links 100 Days of Code
  • Career Toolbox CodeForward Free Treehouse Near Me Jobs Blog Support About
  • Sign In
  • Free Trial
Instagram Twitter Facebook YouTube LinkedIn
    • Newest
      • Newest
      • Active
      • Unanswered
      • Featured
    • All Topics
      • All Topics
      • • General Discussion
      • • AI
      • • Android
      • • APIs
      • • Coding for Kids
      • • College Credit
      • • Computer Science
      • • CSS
      • • Data Analysis
      • • Databases
      • • Design
      • • Development Tools
      • • Digital Literacy
      • • Game Development
      • • Go Language
      • • HTML
      • • Java
      • • JavaScript
      • • Learning Resources
      • • Machine Learning
      • • No-Code
      • • PHP
      • • Professional Growth
      • • Python
      • • Quality Assurance
      • • React
      • • Ruby
      • • Security
      • • Swift
  • Sungbae Park
    Sungbae Park
    9,389 Points

    this is a mess

    Posted December 7, 2015 6:59am by Sungbae Park
    Sungbae Park
    9,389 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    0 Answers

  • Mustafaa Tajuddin
    Mustafaa Tajuddin
    1,321 Points

    Where are _center and _radius?

    Posted June 11, 2015 4:31pm by Mustafaa Tajuddin
    Mustafaa Tajuddin
    1,321 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    0 Answers

  • Kelsey Jones
    Kelsey Jones
    911 Points

    I am getting an info.plist utility error.

    Posted May 21, 2015 12:51pm by Kelsey Jones
    Kelsey Jones
    911 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • Matthew Corby
    Matthew Corby
    2,685 Points

    Shape and Circle program compile results not what they should be

    Posted November 27, 2014 3:29am by Matthew Corby
    Matthew Corby
    2,685 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    2 Answers

  • Adrienne Chan
    Adrienne Chan
    1,045 Points

    I get an error of "expected ';' after method prototype in the Circle.h for the line -(float)area {

    Posted November 20, 2014 5:22pm by Adrienne Chan
    Adrienne Chan
    1,045 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • Chema Castellanos
    Chema Castellanos
    3,984 Points

    don't know if i skip a video

    Posted November 3, 2014 5:13am by Chema Castellanos
    Chema Castellanos
    3,984 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    2 Answers

  • Chema Castellanos
    Chema Castellanos
    3,984 Points

    I cannot get this answer right

    Posted November 3, 2014 4:42am by Chema Castellanos
    Chema Castellanos
    3,984 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    0 Answers

  • Mike Lange
    Mike Lange
    794 Points

    Understanding allocation & initialisation

    Posted October 15, 2014 12:13pm by Mike Lange
    Mike Lange
    794 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • Zach Studdiford
    Zach Studdiford
    6,212 Points

    Rounding Floats

    Posted October 4, 2014 9:58pm by Zach Studdiford
    Zach Studdiford
    6,212 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • Hillman Chen
    Hillman Chen
    1,995 Points

    no instances variables

    Posted September 30, 2014 3:09am by Hillman Chen
    Hillman Chen
    1,995 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    0 Answers

  • Caleb Kleveter
    MOD
    Caleb Kleveter
    Treehouse Moderator 37,862 Points

    What should I do about the sub-class?

    Posted August 26, 2014 6:11pm by Caleb Kleveter
    Caleb Kleveter
    Treehouse Moderator 37,862 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    2 Answers

  • Blaine Fallis
    Blaine Fallis
    2,449 Points

    I am working through Stage 4 Into to Objective-C - the video on inheritance. It's unclear at 5:58 what file he's in

    Posted August 2, 2014 7:10am by Blaine Fallis
    Blaine Fallis
    2,449 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    3 Answers

  • Peter Ramsay
    Peter Ramsay
    1,253 Points

    Introduction to objective-c

    Posted July 13, 2014 2:03am by Peter Ramsay
    Peter Ramsay
    1,253 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • Vedant Nevetia
    Vedant Nevetia
    1,332 Points

    What is the difference between importing a class header and using its methods, and using a @protocol?

    Posted June 2, 2014 7:26am by Vedant Nevetia
    Vedant Nevetia
    1,332 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    0 Answers

  • Alex Cevallos
    Alex Cevallos
    16,551 Points

    #import vs subclassing with :

    Posted May 9, 2014 8:31pm by Alex Cevallos
    Alex Cevallos
    16,551 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • George Locke
    George Locke
    1,062 Points

    messed up inheritance program

    Posted May 8, 2014 5:46pm by George Locke
    George Locke
    1,062 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    1 Answer

  • J.R. Sedivy
    J.R. Sedivy
    2,545 Points

    XCode Output

    Posted March 20, 2014 3:34am by J.R. Sedivy
    J.R. Sedivy
    2,545 Points
    • iOS
    • Objective-C Basics (Retired)
    • Introduction to Objective-C
    • Inheritance

    2 Answers

Posting to the forum is only allowed for members with active accounts.
Please sign in or sign up to post.

    Treehouse

  • About
  • Blog
  • Careers
  • Community
  • Stories
  • Shop
  • Contact
  • Gift Card

See Full Catalogue

Techdegree

  • Front End Web Development
  • Full Stack JavaScript
  • Python Development
  • Data Analysis
  • UX Design

Tracks

  • Learn to Code for Beginners
  • Beginning Python
  • Beginning SQL
  • Beginning Java
  • ...see more

Courses

  • JavaScript Basics
  • Intro to HTML & CSS
  • Python Basics
  • CSS Layout
  • ...see more

Explore

  • Plans
  • Affiliates
  • Perks
  • Free Treehouse Near Me
  • Treehouse for Libraries
  • Treehouse for Businesses
  • Twitter
  • YouTube
  • Facebook
  • LinkedIn
  • Instagram
Terms & Conditions | Privacy

© 2025 Treehouse Island, Inc.