UICollectionViewCell Border / Shadow - objective-c

Question

When building an iPad App, how can you draw a border around a UICollectionViewCell?
More details: I implemented a class ProductCell which extends UICollectionViewCell. Now, I would like to assign some fancy details, e.g. a border, shadow, etc. However, when trying to use something like this here, Xcode tells me that the receiver type 'CALayer' is a forward declaration.

Answer 1

Just for a bit more implementation:
#import <QuartzCore/QuartzCore.h>
in your.m
Make sure your class implements
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath;
as this is where the cell is setup.
You can then change cell.layer.background (only available once quartz is imported)
See below
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {
MyCollectionViewCell *cell = [cv dequeueReusableCellWithReuseIdentifier:#"pressieCell" forIndexPath:indexPath];
//other cell setup here
cell.layer.borderWidth=1.0f;
cell.layer.borderColor=[UIColor blueColor].CGColor;
return cell;
}

Answer 2

Swift
Updated for Swift 3
Assuming you have your Collection View set up with the required methods, you can just write a few lines of code to add the border.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath as IndexPath) as! MyCollectionViewCell
cell.myLabel.text = self.items[indexPath.item]
cell.backgroundColor = UIColor.cyan
// add a border
cell.layer.borderColor = UIColor.black.cgColor
cell.layer.borderWidth = 1
cell.layer.cornerRadius = 8 // optional
return cell
}
Notes
It is not necessary to import QuartzCore in Swift if you have already imported UIKit.
If you also want to add shadow, then see this answer.

Answer 3

You need to include the framework QuartzCore and import the header into your class:
#import <QuartzCore/QuartzCore.h>

Answer 4

Swift 4
cell.layer.borderColor = UIColor.black.cgColor
cell.layer.borderWidth = 1
Add it in datasource method, after creating the cell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionViewCell", for: indexPath)
cell.layer.borderColor = UIColor.black.cgColor
cell.layer.borderWidth = 1
}

Answer 5

I think it is better to add this config into your custom cell implementation, not in datasource delegate method.
cell.layer.borderColor = UIColor.black.cgColor
cell.layer.borderWidth = 1
cell.layer.cornerRadius = 8 // optional