/*

File: OverlayViewController.m

Abstract: The secondary view controller managing the overlap view to the camera.

Version: 1.2

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*/

#import "OverlayViewController.h"

enum

{

kOneShot, // user wants to take a delayed single shot

kRepeatingShot // user wants to take repeating shots

};

@interface OverlayViewController ( )

@property (assign) SystemSoundID tickSound;

@property (nonatomic, retain) IBOutlet UIBarButtonItem *takePictureButton;

@property (nonatomic, retain) IBOutlet UIBarButtonItem *startStopButton;

@property (nonatomic, retain) IBOutlet UIBarButtonItem *timedButton;

@property (nonatomic, retain) IBOutlet UIBarButtonItem *cancelButton;

@property (nonatomic, retain) NSTimer *tickTimer;

@property (nonatomic, retain) NSTimer *cameraTimer;

// camera page (overlay view)

- (IBAction)done:(id)sender;

- (IBAction)takePhoto:(id)sender;

- (IBAction)startStop:(id)sender;

- (IBAction)timedTakePhoto:(id)sender;

@end

@implementation OverlayViewController

@synthesize delegate;

#pragma mark -

#pragma mark OverlayViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]))

{

AudioServicesCreateSystemSoundID((CFURLRef)[NSURL fileURLWithPath:

[[NSBundle mainBundle] pathForResource:@"tick"

ofType:@"aiff"]],

&_tickSound);

self.imagePickerController = [[[UIImagePickerController alloc] init] autorelease];

self.imagePickerController.delegate = self;

}

return self;

}

- (void)viewDidUnload

{

self.takePictureButton = nil;

self.startStopButton = nil;

self.timedButton = nil;

self.cancelButton = nil;

self.cameraTimer = nil;

[super viewDidUnload];

}

- (void)dealloc

{

[_takePictureButton release];

[_startStopButton release];

[_cancelButton release];

[_timedButton release];

[_imagePickerController release];

AudioServicesDisposeSystemSoundID(_tickSound);

[_cameraTimer release];

[_tickTimer release];

[super dealloc];

}

- (void)setupImagePicker:(UIImagePickerControllerSourceType)sourceType

{

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 our custom overlay view for the camera

//

// ensure that our 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];

}

}

}

// called when the parent application receives a memory warning

- (void)didReceiveMemoryWarning

{

// we have been warned that memory is getting low, stop all timers

//

[super didReceiveMemoryWarning];

// stop all timers

[self.cameraTimer invalidate];

_cameraTimer = nil;

[self.tickTimer invalidate];

_tickTimer = nil;

}

// update the UI after an image has been chosen or picture taken

//

- (void)finishAndUpdate

{

[self.delegate didFinishWithCamera]; // tell our delegate we are done with the camera

// restore the state of our overlay toolbar buttons

self.cancelButton.enabled = YES;

self.takePictureButton.enabled = YES;

self.timedButton.enabled = YES;

self.startStopButton.enabled = YES;

self.startStopButton.title = @"Start";

}

#pragma mark -

#pragma mark Camera Actions

- (IBAction)done:(id)sender

{

// dismiss the camera

//

// but not if it's still taking timed pictures

if (![self.cameraTimer isValid])

[self finishAndUpdate];

}

// this will take a timed photo, to be taken 5 seconds from now

//

- (IBAction)timedTakePhoto:(id)sender

{

// these controls can't be used until the photo has been taken

self.cancelButton.enabled = NO;

self.takePictureButton.enabled = NO;

self.timedButton.enabled = NO;

self.startStopButton.enabled = NO;

if (self.cameraTimer != nil)

[self.cameraTimer invalidate];

_cameraTimer = [NSTimer scheduledTimerWithTimeInterval:5.0

target:self

selector:@selector(timedPhotoFire:)

userInfo:[NSNumber numberWithInt:kOneShot]

repeats:YES];

// start the timer to sound off a tick every 1 second (sound effect before a timed picture is taken)

if (self.tickTimer != nil)

[self.tickTimer invalidate];

_tickTimer = [NSTimer scheduledTimerWithTimeInterval:1.0

target:self

selector:@selector(tickFire:)

userInfo:nil

repeats:YES];

}

- (IBAction)takePhoto:(id)sender

{

[self.imagePickerController takePicture];

}

- (IBAction)startStop:(id)sender

{

if ([self.cameraTimer isValid])

{

// stop and reset the timer

[self.cameraTimer invalidate];

_cameraTimer = nil;

[self finishAndUpdate];

}

else

{

// start the timer to take a photo every 1.5 seconds

//

// CAUTION: for the purpose of this sample, we will continue to take pictures indefinitely.

// Be aware we will run out of memory quickly. You must decide the proper threshold

// number of photos allowed to take from the camera.

//

// One solution to avoid memory constraints is to save each taken photo to disk rather

// than keeping all of them in memory.

//

// In low memory situations sometimes our "didReceiveMemoryWarning" method will be called

// in which case we can recover some memory and keep the app running.

//

self.startStopButton.title = @"Stop";

self.cancelButton.enabled = NO;

self.timedButton.enabled = NO;

self.takePictureButton.enabled = NO;

_cameraTimer = [NSTimer scheduledTimerWithTimeInterval:1.5 // fire every 1.5 seconds

target:self

selector:@selector(timedPhotoFire:)

userInfo:[NSNumber numberWithInt:kRepeatingShot]

repeats:YES];

[self.cameraTimer fire]; // start taking pictures right away

}

}

#pragma mark -

#pragma mark Timer

// gets called by our repettive timer to take a picture

- (void)timedPhotoFire:(NSTimer *)timer

{

[self.imagePickerController takePicture];

NSInteger cameraAction = [self.cameraTimer.userInfo integerValue];

switch (cameraAction)

{

case kOneShot:

{

// timer fired for a delayed single shot

[self.cameraTimer invalidate];

_cameraTimer = nil;

[self.tickTimer invalidate];

_tickTimer = nil;

break;

}

case kRepeatingShot:

{

// timer fired for a repeating shot

break;

}

}

}

// gets called by our delayed camera shot timer to play a tick noise

- (void)tickFire:(NSTimer *)timer

{

AudioServicesPlaySystemSound(self.tickSound);

}

#pragma mark -

#pragma mark UIImagePickerControllerDelegate

// this get called when an image has been chosen from the library or taken from the camera

//

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info

{

UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];

// give the taken picture to our delegate

if (self.delegate)

[self.delegate didTakePicture:image];

if (![self.cameraTimer isValid])

[self finishAndUpdate];

}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker

{

[self.delegate didFinishWithCamera]; // tell our delegate we are finished with the picker

}

@end