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iPhone crash randomly when calling a camera?

- (IBAction) getCamera

{

    // set up our camera overlay view  

    // tool bar - handy if you want to be able to exit from the image picker...

    UIToolbar *toolBar=[[UIToolbar alloc] initWithFrame:CGRectMake(0, 480-44, 320, 44)];

 

    UIBarButtonItem *spaceItem  = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace  target:nil action:nil] autorelease];

    UIBarButtonItem *spaceItem1  = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace  target:nil action:nil] autorelease];

    UIBarButtonItem *cancelItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel  target:self action:@selector(cancelPickingImag)] autorelease];

    UIBarButtonItem *cameraItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCamera  target:self action:@selector(finishedAugmentedReality)] autorelease];

 

    spaceItem.width  = 2.0;

    spaceItem1.width = 55.0;

    NSArray *items=[NSArray arrayWithObjects:spaceItem,cancelItem,spaceItem1,cameraItem,nil];

    [toolBar setItems:items];

 

    // create the overlay view

    overlayView=[[OverlayView alloc] initWithFrame:CGRectMake(0, 300, 320, 480-44)];

 

    // important - it needs to be transparent so the camera preview shows through!

    overlayView.opaque=NO;

    overlayView.backgroundColor=[UIColor clearColor];

 

    // parent view for our overlay

    UIView *parentView=[[UIView alloc] initWithFrame:CGRectMake(0,0,320, 480)];

    [parentView addSubview:overlayView];

    [parentView addSubview:toolBar];

    [parentView addSubview:lbl];

    [parentView addSubview:overlayGraphicView];

 

    // configure the image picker with our overlay view

    //UIImagePickerController *picker=[[UIImagePickerController alloc] init];

 

    if ([UIImagePickerController isSourceTypeAvailable:

         UIImagePickerControllerSourceTypeCamera])

    {

        imagePicker = [[UIImagePickerController alloc] init];

        imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

 

        // hide the camera controls

        imagePicker.showsCameraControls=NO;

 

        imagePicker.delegate = self;

        //imagePicker.allowsImageEditing = NO;

 

        // and put our overlay view in

        imagePicker.cameraOverlayView=parentView;

    }

    else

    {

        imagePicker = [[UIImagePickerController alloc] init];

        imagePicker.delegate = self;

        imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

        imagePicker.mediaTypes = [NSArray arrayWithObjects:

                                  (NSString *) kUTTypeImage,

                                  nil];

        imagePicker.allowsEditing = NO;

 

    }

 

    [self presentModalViewController:imagePicker animated:YES];

 

    //Free memory

    [imagePicker release];//,imagePicker =nil;

    [parentView release], parentView=nil;

    [overlayGraphicView release], overlayGraphicView= nil;

    [lbl release], lbl=nil;

    [overlayView release];//, overlayView =nil;

    [toolBar release], toolBar=nil;

}