1、永遠不要假定某個類型的存儲大小,包括Int型
Beginner的參照:
http://www.getappninja.com/blog/how-to-create-a-simple-shooting-game-ios-6-peashooter-part-one
http://www.getappninja.com/blog/how-to-create-a-simple-shooting-game-ios-6-peashooter-part-two
IOS開源項目:從github獲得
http://www.csdn.net/article/2013-06-04/2815530-GitHub-iOS-open-source-projects-one