iOS Components and Frameworks: Understanding the Advanced Features of the iOS SDK

Spawning a Cactus

One of the most important functions in IFCGameViewController is spawning the actual cacti to the screen. In the viewDidLoad method spawnCactus was called twice; turn your attention to that method now. In a state-based game the first thing that should be done is to check to make sure you are in the correct state. The first test that is run is a gameOver check; if the game has ended, the cactus should stop spawning. The next check is a pause test; if the game is paused, you don’t want to spawn a new cactus either, but when the game is resumed you want to start spawning again. The test performed on the paused state will retry spawning every second until the game is resumed or quit.

Click here to view code image

if(gameOver){     ...