Objective-C ZigZag line with CoreGraphics

gistfile1.m

- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextSetStrokeColorWithColor(context, [[UIColor colorWithRed:241.0/255.0 green:241.0/255.0 blue:238.0/255.0 alpha:1] CGColor]);

    CGContextSetLineWidth(context, 0.6);
    
    CGContextMoveToPoint(context, CGRectGetMinX(rect), CGRectGetMaxY(rect) - 5);
    
    CGContextSetShouldAntialias(context, YES);

    for (int i = 0; i < 320; i++) {
        float x = (CGRectGetMinX(rect) + 7) * i;
        float y = CGRectGetMaxY(rect) - 5;
        CGContextAddLineToPoint(context, x, y);
        CGContextAddLineToPoint(context, x + 1, y);

        CGContextAddLineToPoint(context, x + 4, CGRectGetMaxY(rect));
        CGContextSetShouldAntialias(context, NO);
   
    }

    CGContextStrokePath(context);
}