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Implementation of Poly alphabetic Cipher

tab bar controller 自定义颜色和演示demo，精选ios编程学习源码，很好的参考资料。(Tab bar controller custom colors and demonstration of demo, selection of learning IOS programming source code, a good reference.)

侧边伸缩导航栏效果，精选ios编程学习源码，很好的参考资料。(The side effect of stretching the navigation bar, select learning IOS programming source code, a good reference.)

A good guideline for objective c programmers.

Implementation of Transposition Cipher in C

basic code when you learn objective-c.

导航栏，精选ios编程学习源码，很好的参考资料。(The navigation bar, select learning IOS programming source code, a good reference.)

a image for async show

及时通信，及时通信，及时通信，及时通信，及时通信，(Timely communication, timely communication, timely communication, timely communication, timely communication,)

objective-c textfield 下拉菜单实现(objective-c textfield drop-down menu to achieve)