- Rashid Khaleefa
Overview:
Blog
on how to integrate camera into iPhone application.
You
can easily include camera feature into any ios application provided
the device has a camera support, and you make use of the
imagePickerController of apple.
Camera
integration:
You
have to create a secondary view controller for managing the overlap
view to the camera.
This
customises the way how the camera screen should apper once camera is
initiated from your application.
Use
the apples imagepickerController to pic the image snaped.
Creating
overlayViewController
- Declare the needed controlls in .h file
- Implement those in .m
- Include the UIImagePickerControllerDelegate
- Create needed delegates for your overlayViewController
A
Sample overlay having buttons takepicture button and done
button with actions takePhoto, close respectively for
those. Also the delegate methods didTakePicture, the method
where you get the snaped picture and didFinshWithCamera that
can be used to perform any action once you are done with camera.
The .h
file of overlayViewController:
@protocol
OverlayViewControllerDelegate;
@interface
OverlayViewController : UIViewController
<UINavigationControllerDelegate,
UIImagePickerControllerDelegate>
{
id
<OverlayViewControllerDelegate>
delegate;
UIImagePickerController
*imagePickerController;
@private
UIBarButtonItem
*takePictureButton;
UIBarButtonItem
*cancelButton;
}
@property
(nonatomic,
assign)
id
<OverlayViewControllerDelegate>
delegate;
@property
(nonatomic,
retain)
UIImagePickerController
*imagePickerController;
@property
(nonatomic,
retain)
IBOutlet
UIBarButtonItem
*takePictureButton;
@property
(nonatomic,
retain)
IBOutlet
UIBarButtonItem
*cancelButton;
-
(void)setupImagePicker:(UIImagePickerControllerSourceType)sourceType;
//
camera page (overlay view)
-
(IBAction)done:(id)sender;
-
(IBAction)takePhoto:(id)sender;
@end
@protocol
OverlayViewControllerDelegate
-
(void)didTakePicture:(UIImage
*)picture;
-
(void)didFinishWithCamera;
@end
Now in
you .m file, Initiate the imagePickerController and map its delegate
self.imagePickerController
= [[[UIImagePickerController
alloc]
init]
autorelease];
self.imagePickerController.delegate
= self;
-
(void)setupImagePicker:(UIImagePickerControllerSourceType)sourceType
{
NSLog(@"enters
setupImagePicker");
self.imagePickerController.sourceType
= sourceType;
if
(sourceType == UIImagePickerControllerSourceTypeCamera)
{
//
user wants to use the camera interface
//
self.imagePickerController.showsCameraControls
= NO;
if
([[self.imagePickerController.cameraOverlayView
subviews]
count]
== 0)
{
//
setup your custom overlay view for the camera
//
//
ensure that your custom view's frame fits within the parent frame
CGRect
overlayViewFrame =
self.imagePickerController.cameraOverlayView.frame;
CGRect
newFrame = CGRectMake(0.0,
CGRectGetHeight(overlayViewFrame)
-
self.view.frame.size.height
- 10.0,
CGRectGetWidth(overlayViewFrame),
self.view.frame.size.height
+ 10.0);
self.view.frame
= newFrame;
[self.imagePickerController.cameraOverlayView
addSubview:self.view];
}
}
}
This
calls the didFinishWithCamera delegats.
-
(IBAction)done:(id)sender
{
[self.delegate
didFinishWithCamera];
}
Action
that maps takesPhoto. This just calls the takePicture of
imgaePickerController which is responsible for initiating still image
capture.
-
(IBAction)takePhoto:(id)sender
{
[self.imagePickerController
takePicture];
}
Also include the
follwoing delegates of imgePicker which gets called when an image is
taken by the camera.
-
(void)imagePickerController:(UIImagePickerController
*)picker didFinishPickingMediaWithInfo:(NSDictionary
*)info
{
UIImage
*image = [info valueForKey:UIImagePickerControllerOriginalImage];
if
(self.delegate)
[self.delegate
didTakePicture:image];
}
-
(void)imagePickerControllerDidCancel:(UIImagePickerController
*)picker
{
[self.delegate
didFinishWithCamera];
//
tell your delegate we are finished with the picker
}
Thats all for
overlayViewController
Now
How to use this in your class. You have to now include the
overlayController delegate and imgaPickerController in header of the
class where you wish to inclue a button for a camera capture.
Now
call the below function in the button action you need.
-
(void)showImagePicker:(UIImagePickerControllerSourceType)sourceType
{
NSLog(@"entered
showImagePicker camera");
if
([UIImagePickerController
isSourceTypeAvailable:sourceType])
{
[self.overlayViewController
setupImagePicker:sourceType];
[self
presentModalViewController:self.overlayViewController.imagePickerController
animated:YES];
}
}
This
checks for the sourcetype you give that should be a camera sourcetype the syntax is as below
[self
showImagePicker:UIImagePickerControllerSourceTypeCamera];
Thats
it now include the delegates of overlay class that was created
-
(void)didTakePicture:(UIImage
*)picture
{
//do
some thing with the picture.
}
-
(void)didFinishWithCamera
{
[self
dismissModalViewControllerAnimated:YES];
}
The
didTakePicture tells that a picture was taken, you get the
picture you snapped in this delegate. And didFinishWithCamera
tells to finish with the camera.
Thats
it. You get your camera to snap from your application and the image
you snapped.
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