Generating runtime image in iPhone/ iPad

input color in int.

+ (UIImage *)shapeCircle:(int)color {
 
   // create the bitmap context
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
   CGContextRef context = CGBitmapContextCreate(nil,30,30,8,0, colorSpace,kCGImageAlphaPremultipliedLast);
   CFRelease(colorSpace);
  
    // set the fill color
   //CGColorRef fillColor = [[UIColor blackColor] CGColor];
   NSString *hexColor = [NSString stringWithFormat:@"%x", color];
   hexColor = [[@"" stringByPaddingToLength:6 - [hexColor length] withString:@"0" startingAtIndex:0] stringByAppendingString:hexColor];
   float r = [self hexToColorValue:[hexColor substringToIndex:2]];
   float g = [self hexToColorValue:[hexColor substringWithRange:NSMakeRange(2, 2)]];
   float b = [self hexToColorValue:[hexColor substringFromIndex:4]];
 
   //fillColor = [[[UIColor alloc] initWithRed:1 green:0 blue:0 alpha:1] CGColor];
    //CGContextSetFillColor(context, CGColorGetComponents(fillColor));
   CGContextSetRGBFillColor(context, r, g, b, 1);      
   CGContextAddArc(context, 15.0f, 15.0f, 12.0f, 0, 360 * M_PI/180, 1);
   CGContextFillPath(context);
 
   //CGContextSetFillColor(context, CGColorGetComponents([[UIColor whiteColor] CGColor]));
   CGContextSetRGBFillColor(context, 1, 1, 1, 1);
   CGContextAddArc(context, 15.0f, 15.0f, 6.0f, 0, 360 * M_PI/180, 1);
   CGContextFillPath(context);
 
   // convert the context into a CGImageRef
   CGImageRef imageRef = CGBitmapContextCreateImage(context);
   CGContextRelease(context);
   UIImage *image = [[UIImage alloc] initWithCGImage:imageRef];
   CGImageRelease(imageRef);
 
   return [image autorelease];
}

+ (float)hexToColorValue:(NSString *)color {
 NSScanner* scanner = nil;
 unsigned int cInt;
 scanner = [NSScanner scannerWithString:color];
 [scanner scanHexInt:&cInt];
 return (float)cInt / 255;
}