Working with iphone camera

I am using UIPickerView controller for displaying the camera on iphone screen for click event of button. I want to add one button Draw Line on the camera screen and also i want to add an event with that Draw Line Button means if i will click on Dra开发者_运维问答w Line button a one line will be draw on the screen of camera. So pls reply me is it possible? and if yes then pls give me your reply with some examples or links.

This would be possible. You can achieve this with cameraOverlayView in UIImagePickerController.