問題描述
集合視圖單元格未出現 (Collection View Cells not appearing)
我想用 buttons 顯示與我的數組中的字符串一樣多的 collectionViewCells。但是當我啟動模擬器時，只有 CollectionView 的背景，但沒有顯示單元格。可能是什麼錯誤？
這是我的 CollectionViewController 中我附加到 main.storyboard 中 CollectionView 的代碼：
class CollectionViewController: UICollectionViewController {
var Array = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
Array = ["1","2","3","4","5"]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(collectionView: UICollectionView, numberOfItemsSection section: Int) ‑> Int {
return Array.count
}
override func
collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) ‑> UICollectionViewCell {
var cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! UICollectionViewCell
var button = cell.viewWithTag(1) as! UIButton
button.titleLabel?.text = Array[indexPath.row]
return cell
}
}
這些是集合視圖控制器的連接：
參考解法
方法 1:
Did you set the CollectionViewController to the storyboard identity inspector? :)
And I would try to call the reloadData() after you change the data in the viewDidLoad method.
Hope that helps
方法 2:
func layoutCells() {
let layout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsets(top: 0, left: 10, bottom: 10, right: 10)
layout.minimumInteritemSpacing = 5.0
layout.minimumLineSpacing = 5.0
layout.itemSize = CGSize(width: (UIScreen.mainScreen().bounds.size.width ‑ 40)/3, height: ((UIScreen.mainScreen().bounds.size.width ‑ 40)/3))
collectionView!.collectionViewLayout = layout
}
Try this. Call this function from view did load. I think the problem is that your collection is not laid out correctly.
func viewDidLoad() {
layoutCells()
}
If this works you can modify the layout options to meet your needs.
方法 3:
I had a similar problem, I found this that was somehow restraining the size of my cell. Hope this helps.
方法 4:
I removed this code from my CollectionViewController.m file
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];
and cell get appeared
方法 5:
Problem is with setting the title to button, use the following code.
override func
collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) ‑> UICollectionViewCell {
var cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! UICollectionViewCell
var button = cell.viewWithTag(1) as! UIButton
//button.titleLabel?.text = Array[indexPath.row]
button.setTitle(Array[indexPath.row], forState: UIControlState.Normal)
return cell
}
Hope it helps
(by maidi、Pavel Smejkal、Subash、Ges83、Asad Mehmood、Bhavin Kansagara)