import UIKit
class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource {
override func viewDidLoad() {
super.viewDidLoad()
let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical
layout.minimumLineSpacing = 50
layout.minimumInteritemSpacing = 30
layout.itemSize = CGSize(width:100,height:100)
layout.headerReferenceSize = CGSize(width:self.view.bounds.size.width,height:100)
layout.footerReferenceSize = CGSize(width:self.view.bounds.size.width,height:100)
layout.sectionInset = UIEdgeInsetsMake(10, 20, 10, 20)
let collectionView = UICollectionView(frame:self.view.bounds,collectionViewLayout:layout)
collectionView.register(NSClassFromString("UICollectionViewCell"), forCellWithReuseIdentifier: "collectioncell")
self.view.addSubview(collectionView)
collectionView.delegate = self
collectionView.dataSource = self
// Do any additional setup after loading the view, typically from a nib.
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 27
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectioncell", for: indexPath)
cell.backgroundColor = UIColor.red
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}