CoreText绘制基本知识
首先，进行创建一个UIView的子类，并实现如下代码:
- (void)drawRect:(CGRect)rect {
// Drawing code.
//创建要输出的字符串
CGPathRelease(leftColumnPath);CFRelease(framesetter);CFRelease(helvetica);CFRelease(helveticaBold);[string release];UIGraphicsPushContext(context);
}
