save screen image of iphone

 CGRect myRect = [myView bounds];
  UIGraphicsBeginImageContext(myRect.size);

  CGContextRef ctx = UIGraphicsGetCurrentContext();
  [[UIColor blackColor] set];
  CGContextFillRect(ctx, myRect);

  [myView.layer renderInContext:ctx];

  UIImage *image1 = UIGraphicsGetImageFromCurrentImageContext();

  // Replace the following line with code that emails the image
  UIImageWriteToSavedPhotosAlbum(image1, nil, nil, nil);
  UIGraphicsEndImageContext();