我试图实现一个特性，即每当我从底部的collectionview点击按钮时，点击的特定值将反映在中间的collectionview上。 到目前为止，我已经获得了底部的collectionview，但是我不确定我的代码中有什么问题导致我的新collectionview没有显示出来。
import UIKit
class MyButtonCell: UICollectionViewCell{
@IBOutlet weak var buttonOne: UIButton!
@IBOutlet weak var targetButton: UIButton!
var callback: (() -> ())?
override init(frame: CGRect) {
super.init(frame: frame)
commonInit()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
commonInit()
}
func commonInit() -> Void {
contentView.layer.borderWidth = 1
contentView.layer.borderColor = UIColor.black.cgColor
}
@IBAction func buttonTapped(_ sender: UIButton) {
callback?()
}
}
class StevenViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource,UICollectionViewDelegateFlowLayout {
let buttonTitles: [String] = [
"4", "6", "7", "8"
]
var targetButtonTitles: [String] = []
//number array
@IBOutlet var collectionView: UICollectionView!
@IBOutlet weak var targetCollection: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
targetCollection.delegate = self
targetCollection.dataSource = self
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return buttonTitles.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "myCellID", for: indexPath) as! MyButtonCell
let targetCell = targetCollection.dequeueReusableCell(withReuseIdentifier: "target", for: indexPath) as! MyButtonCell
// set the button title (and any other properties)
cell.buttonOne.setTitle(buttonTitles[indexPath.item], for: [])
// set the cell's callback closure
cell.callback = {
print("Button was tapped at \(indexPath)")
self.targetButtonTitles.append(self.buttonTitles[indexPath.item])
print(self.targetButtonTitles)
targetCell.targetButton.setTitle(self.targetButtonTitles[indexPath.item], for: [])
// do what you want when the button is tapped
}
return cell
}
}
我的情节提要:
模拟器中显示的内容:
试试这个。
在CellForItematIndexPath中，必须返回两个单元格才能同时显示它们。
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "myCellID", for: indexPath) as! MyButtonCell
let targetCell = targetCollection.dequeueReusableCell(withReuseIdentifier: "target", for: indexPath) as! MyButtonCell
if collectionView == self.collectionView {
// Setup here your cell
cell.callback = {
print("Button was tapped at \(indexPath)")
self.targetButtonTitles.append(self.buttonTitles[indexPath.item])
print(self.targetButtonTitles)
targetCell.targetButton.setTitle(self.targetButtonTitles[indexPath.item], for: [])
// do what you want when the button is tapped
}
cell.buttonOne.setTitle(buttonTitles[indexPath.item], for: [])
return cell
} else {
// Setup here your targetCell
return targetCell
}
请注意，如果每个collectionView有不同数量的节，则必须独立返回它们。
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.collectionView {
return 1 // Number of sections of your collectionView
}
return 1 // Number of sections of your targetCollection
}
