Save to camera roll kicks in before draw stage is done. How to solve this? (ios)

Other people will have to either confirm or debunk this as an option, but you could add ", true, 0x00000000" to the creation of your BitmapData objects so they will start out as blank bitmaps. Next step is to run a BitmapData.getPixel32() call on either a timer or EnterFrame and once the returned value is no longer 0, you know that the image has been fully drawn.

This thought process is making an assumption that the draw() and copyPixels() methods render pixels in a left-to-right, top-to-bottom order, and start at the (0,0) position. That is the part I was saying that others would have to confirm or debunk as a viable option. I ran a basic test of this on my Mac, and it worked but I don't have an iOS device to test with in a real world case. Basically this method has you checking to see if the bottom right pixel has a pixel color value that is not 0, meaning it has some color value in it.

bitmapdata = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0x00000000);

bitmapDataA = new BitmapData(1536, 1536, true, 0x00000000);

bitmapdata.draw(stage);

bitmapDataA.copyPixels(bitmapdata, new Rectangle(0,236, 1536, 1772), new Point(0, 0));

// in some timer or enter frame

if (bitmapDataA.getPixel32(1535, 1535) != 0) {

    // terminate timer or enter frame

    cameraRoll.addBitmapData(bitmapDataA);

}