UIImagePickerController Overlay takePicture method - ios

Question

I am calling an camera overlay using a xib file by doing the following:
Camera.h
#import <UIKit/UIKit.h>
#import "ControlsViewController.h"
#interface CameraViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate,ProcessDataDelegate>
#property (nonatomic, strong) UIImagePickerController *imagePicker;
#end
Camera.m
#import "CameraViewController.h"
#import "ControlsViewController.h"
#interface CameraViewController ()
#end
#implementation CameraViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
//Get the camera
self.imagePicker = [[UIImagePickerController alloc] init];
self.imagePicker.delegate = self;
self.imagePicker.allowsEditing = NO;
self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];
self.imagePicker.showsCameraControls = NO;
//set our custom overlay view
ControlsViewController *overlayViewController = [[ControlsViewController alloc] initWithNibName:#"ControlsViewController" bundle:nil];
[self addChildViewController:overlayViewController];
self.imagePicker.cameraOverlayView = overlayViewController.view;
[self presentViewController:self.imagePicker animated:NO completion:NULL];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(void)didClickCameraButton {
[self.imagePicker takePicture];
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
#end
This calls the xib and .m .h files for ControlsViewController Within those file I have a button for taking the picture but not sure how to call that method in the overlay. I was thinking of something like:
Overlay.H
#import <UIKit/UIKit.h>
#protocol ProcessDataDelegate <NSObject>
#end
#interface ControlsViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
id <ProcessDataDelegate> delegate;
}
- (IBAction)cameraButton:(id)sender;
- (IBAction)kennedyButton:(id)sender;
#property (retain) id delegate;
-(void)didClickCameraButton;
#end
Overlay.M
#import "ControlsViewController.h"
#import "CameraViewController.h"
#interface ControlsViewController ()
#end
#implementation ControlsViewController
#synthesize delegate;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
[self.view setBackgroundColor:[UIColor clearColor]];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
- (IBAction)cameraButton:(id)sender {
NSLog(#"this button works");
[self.delegate didClickCameraButton];
}
- (IBAction)kennedyButton:(id)sender {
NSLog(#"this button works");
}
#end
but obviously the imagePicker property is not being carried over the the overlays .m file. Anyone know how to go about this? I imported the cameras .H file on the overlays .m file as well but no luck. Thanks.

Answer 1

In your overlayViewController, is the button linked to cameraButton:? You have several layers of controls, and ultimately you want the main controller (the one you're showing viewDidLoad for) to call [self.imagePicker takePicture]. You can add a delegate to overlayViewController, so that when cameraButton: is called, it just tells the delegate.
Obviously you'll have to create a protocol, set a delegate, etc.
Edit: usual patterns for delegates are that the delegate is weak. You may have to have the overlayController not be transient if you're using arc.
ControlsViewController.h
#interface ControlsViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
{
// don't need the delegate declared in here
}
#property (weak) id delegate;
ControlsViewController.m
- (IBAction)cameraButton:(id)sender {
NSLog(#"this button works");
[self.delegate didClickCameraButton];
}
YourMainViewController.h
#interface YourMainViewController : UIViewController <ControlsViewDelegate>
{
ControlsViewController *overlayController;
}
YourMainViewController.m
- (void)viewDidLoad {
[super viewDidLoad];
...
overlayViewController = [[ControlsViewController alloc] initWithNibName:#"ControlsViewController" bundle:nil];
overlayViewController.delegate = self;
self.imagePicker.cameraOverlayView = overlayViewController.view;
[self presentViewController:self.imagePicker animated:NO completion:NULL];
}
-(void)didClickCameraButton {
[self.picker takePicture];
}