cells loads multiple times while it's visible if you scroll fast many times.

[IsmailHassanein]

while paging is off when I scroll quickly from Jan 2013 to Dec 2022 on iPad 2, I've saw the cells tiltes keep changing many times quickly for about 2 seconds. I got a chance to take a screenshot of it.

If you see the first shot you will find the numbers is wrong and even has duplicate berfore it tured to the correct numbers(in the second shot).

[WenchaoD]

The data of the cells are loaded asyncronously for a better scrolling performance, didn't expect this side effect happen. Let me think this over...

[WenchaoD]

BTW. Which system version? 7+,8+,or 9+

[IsmailHassanein]

iPad 2 iOS 8.4.1
I see the asynchronous loading. I think it's a good idea. I think you need to keep track of the cell you loading if it's not visible or dequeued for diffrenet indexPath you should discard this loading.

[WenchaoD]

Try this?

[IsmailHassanein]

It's Woking good. Btw, The memoery usage has been droped alot too 👍 .

[WenchaoD]

Looks today is really my day. Thanks.

[WenchaoD]

Hi @Ishass
I realized today that there are other important reasons for the bad performance.

1. I shoundn't use self.selectedDates inside FSCalendar.m because everytime it's been called, a new NSArray instance will be created. It's somehow necessary because if not, when enumerating calendar.selectedDates and deselect dates, it cause inserting and deleting issue for Array. Now I've changed the usage inside FSCalendar.m to _selectedDates, it performs better.
2. The NSDate+FSExtension.h uses NSDateFormatter many times, and the old way is to create NSDateFormatter every time, that's another reason that cause bad scrolling performace.

Now that the asyncrous property might not be required anymore. I've pushed the commits into 1.6.3. You'd like to try this?