No visible @interface for 'UIView' declares the selector 'captureImage'

gistfile1.cpp

#import "ViewController.h"
#import "LTUCameraView.h"
#import "LTUManager.h"


@interface ViewController ()

@end

@implementation ViewController


- (void)viewDidLoad
{
    [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

    CGFloat screenAspectRatio = self.view.frame.size.height / self.view.frame.size.width;
    CGFloat normalizeRatio = screenAspectRatio / 1.3;
    CGRect cameraFrame = CGRectMake(0,
                                    0,
                                    self.view.frame.size.width * normalizeRatio,
                                    self.view.frame.size.height);
    self.camView = [[LTUCameraView alloc] initWithFrame:cameraFrame];
    [self.view insertSubview:self.camView atIndex:0];

}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (IBAction)snap:(id)sender {NSLog(@"Snap!");
    UIImage *image = [self.camView captureImage];
}
@end