我正在尝试以编程方式创建一个包含六个单元格的集合视图。 Xcode 8 中的 iPhone 模拟器告诉我我的构建成功了。但仍然有一个错误。
非常感谢您帮助发现导致我的单元格不显示在模拟器中的错误。 （我将 Collection View 直接从对象库放入 IB 中。另外，我希望每个单元格占据 Collection View 的整个大小，因此displayedCellDimensions，因为当点击前进或后退按钮时，用户将在单元格之间进行切换。）谢谢！
import UIKit
class FluidIntakeMainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
//MARK: - Collection View Properties
@IBOutlet weak var ibCollectionView: UICollectionView!
var cellArray:[customCollectionViewCell] = Array(repeating: customCollectionViewCell(), count: 6)
let displayedCellDimensions = CGSize(width: 343, height: 248)
//MARK: - Xcode-generated Methods
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
ibCollectionView.dataSource = self
ibCollectionView.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: - Collection View Methods
//Place cells in collection view and change the cell size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if collectionView.visibleCells.isEmpty {
for cell in 0...cellArray.count {
collectionView.addSubview(cellArray[cell])
return CGSize(width: 343, height: 248)
}
}
return CGSize(width: 343, height: 248)
}
//Register a new cell
func registerCell(_ collectionView: UICollectionView) {
for _ in 0...cellArray.count {
collectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath)
return cell
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return cellArray.count
}
...}
在你的 viewDidLoad() 中尝试：
viewDidLoad() {
ibCollectionView.dataSource = self
ibCollectionView.delegate = self
}
将其添加到类的顶部：
class FluidIntakeMainMenuViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
您必须在 ViewController 类中使用这些函数：
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {}
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