How to get the drawing on a UIScrollView

UIGraphicsBeginImageContext(drawingViewController.imageView.frame.size);

drawingViewController.imageView.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *finishedPic = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

UIImageWriteToSavedPhotosAlbum(self, @selector(exitProg:didFinishSavingWithError:contextInfo:), nil);

Window,View,ViewController,UIImageView,UIScrollView

Use a lot of them in the couple days, so it is very necessary to identify these concept.

1. Window

it is simple in one word: one app one window. All you actives is under that window

2. View

window is based on multiple views, View is what you show to the user

3. View Controller

4. UIImageView

5.UIScrollView

Long way to go.

I bought a Macbook last year, but in the past year, I use it as a PC, what a shame

SO I am thinking of familiar with this powerful machine first