[英]UICollectionView is showing but the cells are not showing in swift
我以編程方式創建了一個collectionView(沒有storyboard)。 我將背景顏色設置為紅色,並且顯示正確。 但細胞沒有顯示出來。 有誰知道為什么細胞沒有顯示?
private let cellId = "cellId"
class InfoViewShow: NSObject, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout {
private let cellHeight:CGFloat = 80
var collectionView: UICollectionView?
let layout = UICollectionViewFlowLayout()
override init() {
super.init()
setupCollectionview()
collectionView?.registerClass(InfoCell.self, forCellWithReuseIdentifier: cellId)
}
private func setupCollectionview() {
if let view = UIApplication.sharedApplication().keyWindow {
//let y = (view.frame.width * 10 / 16) + 34 + 26
collectionView = UICollectionView(frame: .zero , collectionViewLayout: layout)
collectionView?.backgroundColor = UIColor.redColor()
collectionView?.delegate = self
collectionView?.dataSource = self
collectionView?.frame = CGRectMake(0, 0, view.frame.width, view.frame.height) // y to y
}
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 3
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(cellId, forIndexPath: indexPath)
cell.backgroundColor = UIColor.blackColor()
return cell
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSizeMake(collectionView.frame.width, cellHeight)
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAtIndex section: Int) -> UIEdgeInsets {
return UIEdgeInsetsMake(5, 5, 5, 5); //top,left,bottom,right
}
}
我沒有看到你添加collectionView
來查看。
if let view = UIApplication.sharedApplication().keyWindow {
//let y = (view.frame.width * 10 / 16) + 34 + 26
collectionView = UICollectionView(frame: .zero , collectionViewLayout: layout)
collectionView?.backgroundColor = UIColor.redColor()
collectionView?.delegate = self
collectionView?.dataSource = self
collectionView?.frame = CGRectMake(0, 0, view.frame.width, view.frame.height) // y to y
///try add
self.view.addSubview(collectionView)
}
您必須實現UICollectionViewDataSource
委托方法的numberOfSectionsInCollectionView
。 此方法是可選的,但您必須實現它並返回至少一個部分。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.