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Ipad/Iphone 上传和下载文件的源代码，抛砖引玉，希望对大家能有所启迪！(Ipad/Iphone upload and download the source code file, the hope can be an inspiration to everyone!)

稀疏表示，使得数据简单看，而且易懂，是流行的一种数据表示方法(Sparse representation，Make the data look simple, but to understand, is one of the popular data representation method)

产生两不迥频率的信号，并对两信号作复数FFT变换，找出频率为50Hz的信号对其进行能量计算(Two distant signal is not generated frequency, and two signals for complex FFT transform to identify the frequency of 50Hz signal to calculate its energy)

说明：  各种格式阅读器，还是非常好用的！！！！！！！！！！！！！！(Reader in various formats, still very nice! ! ! ! ! ! ! ! ! ! ! ! ! !)

NSString框架的学习，包括NSNumber等 NSString框架的学习，包括NSNumber等(NSString framework of learning, including learning NSNumber etc. NSString framework, including NSNumber etc.)

微信功能实现通信机制沟通你我他.在你我他之间架起沟通的桥梁(Micro-channel communication mechanism to achieve functional communication you and me. Between you and me, he acted as bridges)

摄像功能实现，Camera function realization(Camera function realization, Camera function realization)

台湾苼科A7102的芯片资料，内含操作说明(Taiwan Sheng Section A7102 chip data, contains instructions)

STM8L101F3数码管显示_追梦效果_跑马灯——模拟SPI比如：数码管显示可以从0跑到9，也可以从9跑到0；可以在数码管外跑圈圈等等!实用于做实验等等

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