Question

we all know that the cell in uitableview can be resued, but i am seeing some weird results.
i am create a custom cell, each cell has 4 columns, each column has an image
so format is like this
|img|img|img|img|
after the cell is returned, i am configuring each cell, an example would be configuring first column to picture 1, then second column to different picture

now just assuming that i can only display two rows at a time in the tableview:

|a0|a1|a2 |a3 |
|b4|b5|b6 |b7 |
------cell c not visible to user------
|c8|c9|c10|c11|

as user scrolls down, column ‘a’ (a0-a3) above, will become invisible, and as far i know that cell becomes invisible will be reused for column c

the example above works fine, if i can fully occupy every cell/row, i.e. i have total 12 pictures.

but if i have say 10 pictures (last row will be filled with only 2, and the other two are empty, like as the following:

|a0|a1|a2 |a3 |
|b4|b5|b6 |b7 |
------row/cell 'c' not visible to user------
|c8|c9|empty|empty|

however, problem arises, when i scroll up to see cell/row ‘c’
i have the following picture:

|a0|a1|a2 |a3 |
------row/cell 'a' not visible to user------
|b4|b5|b6 |b7 |
|c8|c9|a2|a3|

notice that the row/cell c’s last two columns should be empty, but is showing a2 and a3 instead

how can i fix this? i am thinking about a manual way of doing this, i.e. by checking if i should remove unnecessary views etc when reusing, but could be more complicated
is there a more systematic way of doing this that is easier and cleaner?

is there a way we could ask the returned cell to forget its content, or do i have to do this myself?

thanks

Answer 1

I had a similiar issue recently. Override prepareForReuse after subclass the tableview cell fixed it. Got the answer from here