这本是讲述的内容是利用Xcode 4.x的IDE进行iOS的开发工作，里面不仅仅是讲述Obje-c的开发知识，还讲述了新版本开发工具Xcode的一些新特性。-This is about the content is using Xcode 4. X IDE for cisco iOS development work, it is not just about Obje-c development knowledge, also tells the new versions of some new Xcode tools development characteristics.