Enable custom controls

``` objc

    self.simpleCam = [SimpleCam new];
    self.simpleCam.delegate= self;
    
    [self.simpleCam setHideControls:YES];
    [self.simpleCam setDisablePhotoPreview:YES];
    
    CGRect frame;
    frame.size = CGSizeMake(self.view.frame.size.width, 120);
    frame.origin.x = 0;
    frame.origin.y = self.view.frame.size.height -frame.size.height;
    UIView *overlayView = [[UIView alloc] initWithFrame:frame];
    overlayView.backgroundColor = [UIColor blackColor];
    overlayView.alpha = 0.3;
    
    UIImage *image = [UIImage imageNamed:@"shutter"];
    frame.size = image.size;
    frame.origin.x = (overlayView.frame.size.width -frame.size.width)/2;
    frame.origin.y = (overlayView.frame.size.height -frame.size.height)/2;
    UIButton *button = [[UIButton alloc] initWithFrame:frame];
    [button setImage:image forState:UIControlStateNormal];
    [button addTarget:self action:@selector(actionPhoto) forControlEvents:UIControlEventTouchUpInside];
    [overlayView addSubview:button];
    [self.simpleCam.view addSubview:overlayView];
    
    [self presentViewController:self.simpleCam animated:YES completion:nil];
    
- (void)actionPhoto
{
    [self.simpleCam  capturePhoto];
}
```