A practice of quartz. Draw something like table -///-

gistfile1.m

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor (context, 0, 0, 0, 1);
CGContextSetLineWidth(context, 1);

CGContextSetTextMatrix(context, CGAffineTransformMake(1.0,0.0, 0.0, -1.0, 0.0, 0.0));

int hours = 0;
float gap = self.height / 24;
for (float y = gap; y < self.height + gap / 2; y += gap) {
    
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), 0, y);
    CGContextAddLineToPoint(context, self.width, y);
    
    CGContextSelectFont(context,
                        "Helvetica-Bold",
                        gap,
                        kCGEncodingMacRoman);
    CGContextSetCharacterSpacing(context, 0);
    CGContextSetTextDrawingMode(context, kCGTextFill);
    
    CGContextSetRGBStrokeColor(context, 0, 0, 0, 1);
    const char *str = [[NSString stringWithFormat:@"%02d", hours] cStringUsingEncoding:NSUTF8StringEncoding];
    CGContextShowTextAtPoint(context, 3, y, str, strlen(str));
    
    hours++;
}

CGContextDrawPath(context, kCGPathStroke);