Scrolling so fast does not trigger calendarCurrentPageDidChange

[IsmailHassanein]

Hi @WenchaoIOS
I have a probelm. when I scroll very fast in Horizontal direction calendarCurrentPageDidChange delegate method sometimes not called.
To reperduce this bug:
open SwiftExample and just change the scrollingDirection to Horizontal.
calendar.scrollDirection = .Horizontal
start scrolling as fast as you can serveral time and watch the debug area to see the messages printed calendarCurrentPageDidChange
Thanks.

[WenchaoD]

I C ...
scrollViewWillEndDragging: delegate method will not get triggered when you scroll really fast. Seems to be a problem of UIScrollView. Have any suggestion?

[IsmailHassanein]

@WenchaoIOS After doing some tests. I found that scrollViewDidEndDecelerating is always called after the scrollView stops scrolling.

You may check recalculate the current page using the contentOffset and it is not updated. update it and call the delegate method. Something like below:

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    if (!_pagingEnabled) {
        return;
    }
     CGFloat currentOffset = 0, contentSize = 0;
    switch (_collectionViewLayout.scrollDirection) {
        case UICollectionViewScrollDirectionHorizontal: {
            currentOffset = scrollView.contentOffset.x;
            contentSize = scrollView.fs_width;
            break;
        }
        case UICollectionViewScrollDirectionVertical: {
            currentOffset = scrollView.contentOffset.y;
            contentSize = scrollView.fs_height;
            break;
        }
        default: {
            break;
        }
    }
    if (_minimumDate) {
        NSDate *newPage;
        switch (_scope) {
            case FSCalendarScopeMonth: {
                newPage = [_minimumDate fs_dateByAddingMonths:currentOffset/contentSize].fs_dateByIgnoringTimeComponents.fs_firstDayOfMonth;
                break;
            }
            case FSCalendarScopeWeek: {
                newPage = [_minimumDate fs_dateByAddingWeeks:currentOffset/contentSize].fs_dateByIgnoringTimeComponents.fs_firstDayOfWeek;
                break;
            }
            default: {
                break;
            }
        }
        if (![_currentPage fs_isEqualToDateForDay: newPage]) {
            [self willChangeValueForKey:@"currentPage"];
            _currentPage = newPage;
            [self currentPageDidChange];
            [self didChangeValueForKey:@"currentPage"];
        }
    }
}

I hope this help.

[WenchaoD]

Got it. I'll take this into consideration.

[WenchaoD]

Should've been fixed. Sorry for being late as there's no solution from Google.