如何在UICollectionView Swift中显示多个图像

Question

This extension gives only one UIImageView inside CollectionView. How to show more images, depends of the size of photos array. Photos array contains array of Url to images (String).

extension FlatViewController: UICollectionViewDataSource{
        func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
            return (flat.photos?.count)!
        }
        func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
            let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! CustomCollectionViewCell

            cell.imageView.loadImageFromURL(NSURL(string: flat.image!)!)
            return cell
        }
    }

Answer 1

Well you can simply go into Interface Builder and put in the amount of ImageView elements into your CollectionViewCell as you would want. Then create IBOutlets to reference your added ImageView elements in your CollectionViewController . Then within the function cellForItemAtIndexPath just plug in each the Image URL for each IBOutlet ImageView's .

That should work.

Answer 2

In UICollectionViewCell subclass programmatically create UIImageView s based on the photos array's subarrays. You can do this by setting up two protocols and implementing a delegate pattern where your FlatViewController is the delegate of your subclass.

The protocols would look something like this:

protocol PhotoDelegate {

  var photos: [[NSURL]] { get set }

}

protocol HasPhotos {

  var delegate: PhotoDelegate! { get set }

}

The delegate pattern will allow you to access the photos array from the subclass. You should set the dequeued cell variable's delegate property and cast it as your subclass in cellForRowAtIndexPath . Like So

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "<Insert Identifier>", for: indexPath) as! Subclass
cell.delegate = self

If you have any questions just ask! I love to help.