NSString.m

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.)

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：  ST分段控制的iOS，精选ios编程学习源码，很好的参考资料。(ST segment control of iOS, ios programming learning source selection, a good reference.)

ios 6 programming and example source

二维码编码，QR码实现，Two-dimensional coding, QR code to achieve, Two-dimensional coding(Two-dimensional coding, QR code to achieve, Two-dimensional coding)

Detection of QRS wave of more detailed procedures, including the starting point of QRS wave, peak detection.

Sample application to show the use of a new open source framework for making graphs called Core Plot

How to check the url connections. Pretty straight forward.

很实用的IPHONE完美实现自定义软键盘(IPHONE perfect realization of very useful custom keyboard)

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.)