画圆

- (void)drawRect:(CGRect)rect {    // Drawing code    //1.获取图形上下文    CGContextRef context = UIGraphicsGetCurrentContext();    //2.创建路径    CGMutablePathRef path = CGPathCreateMutable();    //3.给Path里面添加一个圆，在Rect里面画圆    CGPathAddEllipseInRect(path, NULL, rect);    //4.把Path加到context里面    CGContextAddPath(context, path);    //5.设置填充颜色    [[UIColor redColor] set];    //CGPathRelease(path);    CFRelease(path);    //6.kCGPathFill填充    CGContextDrawPath(context, kCGPathFill);}