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iOS

Posted by Unsubscribed User
Unsubscribed User
42 Points

Configure cell at user defined index path

Hey there! Let’s say I got a collection view with some sections and some cells in each section. Now I want the user to be able to choose a cell by entering an index path in form of two integers in a text field. Then the user chooses a background color for the cell at the defined index path. How would you do that? Thanks a lot!

1 Answer

ianhan3
ianhan3
4,263 Points

Assuming the integers can be equated to the collection view cells (for example if you're trying to access section 1 of a collection view that only has 1 section, you'll return nil and crash) you can set up a function that takes in parameters like this: 

func chooseIndexPath(inSection: Int, forItem: Int, backgroundColor: UIColor) {
    let indexPath = NSIndexPath(forItem: forItem, inSection: inSection)
    let cell = collectionView.cellForItemAtIndexPath(indexPath)
    cell?.backgroundColor = backgroundColor
    collectionView.reloadData()
}

If you wanted them to choose a background color for it after they pick you can return the index path and pass that to a new function to be called at another time. The best way to do this though is for them not to input integers at all and just call the function in the didSelect delegate method of the collection view. Then you can have something like a popover controller pop up and create a protocol back that will pass the chosen color back to the main VC and reload the collection view.