Pie Chart: https://github.com/honcheng/iOSPlot
Pie Chart: https://github.com/tylerneylon/moriarty
Bar Chart: http://www.devdiv.com/iOS_iPhone-%E5%88%86%E4%BA% AB %E4%B8%80%E4%B8%AA%E5%88% AB %E4%BA%BA%E7%9A%84%E6%9F%B1%E5%9B%BE-thread-70067-1-1.html
Calendar: https://github.com/klazuka/Kal
Text conversion:
CGContextSetFillColorWithColor(context,[UIColor blackColor].CGColor); CGAffineTransform transform = CGAffineTransformIdentity; transform = CGAffineTransformTranslate(transform, x, y); //A transform = CGAffineTransformRotate(transform, - M_PI/6); //B transform = CGAffineTransformTranslate(transform, -x, -y); //C //CGAffineTransform rotateTransform = CGAffineTransformMakeRotation(- M_PI/6); CGContextSaveGState(context); CGContextConcatCTM(context, transform); [_lab.label drawAtPoint:CGPointMake(x,y) withFont:_font]; CGContextRestoreGState(context);