CODEWITHSUNDEEP
iosobjective-cautolayoutuicollectionview
Nick Ginanto
Nick Ginanto

Reputation: 32140

Calculating sizeForItemAtIndexPath in UICollectionView without using the cells

I am in a loop with myself on from where to get the cell's size in a collection view in case I have a cell with auto layout

I understand that sizeForItemAtIndexPath should get the size from the data and not from the cell itself, because the cell is not drawn yet, but in auto layout I can't calculate this just by looking at the data, unless I put in code the contraints in a way that I can later calculate from them (seems crooked)

On the other hand, UIView does have intrinsicContentSize and systemLayoutSizeFittingSize which gives the size of a view that's already drawn or going to be drawn.

But in sizeForItemAtIndexPath I don't have a view yet, and the data is just data.

the cell nib looks like this enter image description here

In what way should I get the size of a custom cell (from .nib)?

I could technically hard code sizes for the images and icons, but that feels wrong. It also feels wrong to ask the view what size it is in a function that should tell the controller what size it is

Upvotes: 3

Views: 3203

Answers (1)

Rory McKinnel
Rory McKinnel

Reputation: 8014

You can use an off screen prototype cell which you configure and then use to determine its size.

This is a common approach for UITableView pre iOS8 to determine cell height. The same approach should work for UICollectionView.

See the accepted answer here: Using Auto Layout in UITableView for dynamic cell layouts & variable row heights

Upvotes: 2

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