Here's a simplified version of how you could implement a timer system in your game using Objective-C:

Creating Rounded UITableview or UICollectionview with Scrolling Images

Understanding View Controller Communication in iOS: A Powerful Technique for Passing Data Between View Controllers

Sorting Users Based on Location in iPhone App: A Step-by-Step Guide

How to Detect Denied Core Location Permissions on iOS: A Step-by-Step Guide

Detecting iPhone Proximity with Raspberry Pi: A Beginner's Guide

Understanding the Problem: Preventing Memory Leaks and App Crashes in Objective-C

Understanding iOS Orientation Support for Seamless User Experience

Understanding the Limits of UIActivityViewController: Resolving Service Picker Issues When Sharing Content from Your App.

Transitioning to View Programmatically in iOS for a Seamless User Experience