摘要：
记录一下：Add the following directive into the Compiler Flags field: -fno-objc-archttp://korutech.hubpages.com/hub/Adding-non-ARC-sources-to-ARC-projects 阅读全文
摘要：
BackgroundSingletons classes are an important concept to understand because they exhibit an extremtely useful design pattern.This idea is used throughout the iPhone SDK, for example, UIApplication has a method called sharedApplication which when called from anywhere will return the UIApplication ins 阅读全文