SwipeView problem

Question

iPhone

I'm trying to understand SwipeView , there was a problem when using it in my project, I use the following code from the example (Paging example) :

-(void)viewDidLoad{
    [super viewDidLoad];

    _swipeView.pagingEnabled = YES;
}

- (NSInteger)numberOfItemsInSwipeView:(SwipeView *)swipeView{
    return [_items count];
}

- (UIView *)swipeView:(SwipeView *)swipeView viewForItemAtIndex:(NSInteger)index reusingView:(UIView *)view{

    //create new view if no view is available for recycling
    if (view == nil)
    {
        //don't do anything specific to the index within
        //this `if (view == nil) {...}` statement because the view will be
        //recycled and used with other index values later
        view = [[UIView alloc] initWithFrame:self.swipeView.bounds];
        view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

    }

    //set background color
    CGFloat red = arc4random() / (CGFloat)INT_MAX;
    CGFloat green = arc4random() / (CGFloat)INT_MAX;
    CGFloat blue = arc4random() / (CGFloat)INT_MAX;
    view.backgroundColor = [UIColor colorWithRed:red
                                           green:green
                                            blue:blue
                                           alpha:1.0];

    return view;
}

- (CGSize)swipeViewItemSize:(SwipeView *)swipeView
{
    return self.swipeView.bounds.size;
}

The application crashes with an error: CALayer position contains NaN: [nan 284]and points to a line with

view.center = CGPointMake(center.x, _scrollView.frame.size.height/2.0f);

.
Whole method:

- (void)setFrameForView:(UIView *)view atIndex:(NSInteger)index
{
    if (self.window)
    {
        CGPoint center = view.center;
        
        if (_vertical)
        {
            center.y = ([self offsetForItemAtIndex:index] + 0.5f) * _itemSize.height + _scrollView.contentOffset.y;
        }
        else
        {
            center.x = ([self offsetForItemAtIndex:index] + 0.5f) * _itemSize.width + _scrollView.contentOffset.x;// center.x NAN
        }
        
        BOOL disableAnimation = !CGPointEqualToPoint(center, view.center);
        BOOL animationEnabled = [UIView areAnimationsEnabled];
        if (disableAnimation && animationEnabled) [UIView setAnimationsEnabled:NO];
        
        if (_vertical)
        {
            view.center = CGPointMake(_scrollView.frame.size.width/2.0f, center.y);
        }
        else
        {
            view.center = CGPointMake(center.x, _scrollView.frame.size.height/2.0f);
        }
        
        view.bounds = CGRectMake(0.0f, 0.0f, _itemSize.width, _itemSize.height);
        
        if (disableAnimation && animationEnabled) [UIView setAnimationsEnabled:YES];
    }
}

When using breakpoints, it shows that center.x becomes NAN at some point (I indicated where in the comment). I can not understand what the problem is, I seem to do everything as in the example. Please help me figure out what to do.
EDIT:
Found the cause of the problem: it is due to the fact that there is a Navigation segue from the initial ViewControllera in the VC with SwipeView.
Github

Answer 1

I'm trying to figure out why this is happening, but one solution to this problem is to add [self.view addSubview:_swipeView] to your viewDidLoad method. I think that the problem is with the life cycle and in what sequence the loading occurs in the swipeView itself.