UICollectionView: How to handle reloadData() and performBatchUpdates() together
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I have UIRefreshControl whose selector calls collectionView.reloadData(). My collectionView uses paginated API to load data on while scrolling. Hence I do collectionView.insertItems(at:indexpaths) to add next paginated data.
I am facing a problem when I scroll the collectionView to get next paginated data and refresh the collectionView. Hence the reload and insert will be called together, app crashes with the error message `
"attempt to insert item 9 into section 0, but there are only 9 items
in section 0 after the update"
`
How do I handle such situation gracefully?
ios swift uicollectionview
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
add a comment |
I have UIRefreshControl whose selector calls collectionView.reloadData(). My collectionView uses paginated API to load data on while scrolling. Hence I do collectionView.insertItems(at:indexpaths) to add next paginated data.
I am facing a problem when I scroll the collectionView to get next paginated data and refresh the collectionView. Hence the reload and insert will be called together, app crashes with the error message `
"attempt to insert item 9 into section 0, but there are only 9 items
in section 0 after the update"
`
How do I handle such situation gracefully?
ios swift uicollectionview
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44
add a comment |
I have UIRefreshControl whose selector calls collectionView.reloadData(). My collectionView uses paginated API to load data on while scrolling. Hence I do collectionView.insertItems(at:indexpaths) to add next paginated data.
I am facing a problem when I scroll the collectionView to get next paginated data and refresh the collectionView. Hence the reload and insert will be called together, app crashes with the error message `
"attempt to insert item 9 into section 0, but there are only 9 items
in section 0 after the update"
`
How do I handle such situation gracefully?
ios swift uicollectionview
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
I have UIRefreshControl whose selector calls collectionView.reloadData(). My collectionView uses paginated API to load data on while scrolling. Hence I do collectionView.insertItems(at:indexpaths) to add next paginated data.
I am facing a problem when I scroll the collectionView to get next paginated data and refresh the collectionView. Hence the reload and insert will be called together, app crashes with the error message `
"attempt to insert item 9 into section 0, but there are only 9 items
in section 0 after the update"
`
How do I handle such situation gracefully?
ios swift uicollectionview
ios swift uicollectionview
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
asked Nov 29 '18 at 5:30
rishu1992rishu1992
6792724
6792724
Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44
add a comment |
Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44
Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44
add a comment |
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Why reload data is required when you are inserting row manually?
– Kazi Abdullah Al Mamun
Nov 29 '18 at 5:45
reloadData() is called when I refresh the collection view using UIRefreshControl. Refresh is user initiated. Hope you understood the question
– rishu1992
Nov 29 '18 at 6:02
I think problem is with datalist, which you are using to populate collectionview. You need to update datalist before reload.
– Kazi Abdullah Al Mamun
Nov 29 '18 at 6:12
It works fine if reloadData() and insertItem() user flow done seperately
– rishu1992
Nov 29 '18 at 6:44