我已将协议UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIScrollViewDelegate
符合名为CollectionViewWeekDelegate
的单独类,但didSelectItemAt
之类的委托方法未被调用。
我还将委托设置为CollectionView
viewDidLoad()
请找到以下代码:
委托班级
class CollectionViewWeekDelegate: NSObject, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIScrollViewDelegate {
internal var parent: EarningsViewController?
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
parent?.weekTabSelectedPosition = indexPath.item
let indexPathh = IndexPath(item: indexPath.item, section: 0)
parent?.collectionViewSchedule.scrollToItem(at: indexPathh, at: .right, animated: true)
parent?.collectionViewWeeks.scrollToItem(at: indexPath, at: .top, animated: true)
parent?.collectionViewWeeks.reloadData()
}
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
let offsetX = parent?.collectionViewSchedule.contentOffset.x
let contentWidth = parent?.collectionViewSchedule.bounds.width
let page = Int(offsetX! / contentWidth!)
parent?.weekTabSelectedPosition = page
var earningsText = "\("grossEarnings".localize()) $\(String(format: "%0.2f", 0.0))"
if let earnings = parent?.schedules?[page].grossWeekSalary{
earningsText = "\("grossEarnings".localize()) $\(String(format: "%0.2f", earnings))"
parent?.buttonGrossEarnings.setTitle(earningsText, for: .normal)
parent?.collectionViewWeeks.selectItem(at: IndexPath(item: page, section: 0), animated: true, scrollPosition: .centeredHorizontally)}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if collectionView.tag == 2{
return CGSize(width: UIScreen.main.bounds.width, height: (parent?.collectionViewSchedule.bounds.height)!)
}else{
return CGSize(width: 150, height: 50)
}
}
}
正在分配CollectionView
委托的viewDidLoad函数:
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.title = "schedule".localize()
self.navigationItem.leftBarButtonItem = super.getMenuBartItem()
if let flowLayout = collectionViewWeeks.collectionViewLayout as? UICollectionViewFlowLayout{
flowLayout.estimatedItemSize = CGSize(width: 150, height: 50)
}
if let collectionFlowLayout = collectionViewSchedule.collectionViewLayout as? UICollectionViewFlowLayout{
collectionFlowLayout.minimumLineSpacing = 0
collectionFlowLayout.minimumInteritemSpacing = 0
}
let weekDelegate = CollectionViewWeekDelegate()
weekDelegate.parent = self
collectionViewWeeks.delegate = weekDelegate
collectionViewSchedule.delegate = self
collectionViewWeeks.reloadData()
}
答案 0 :(得分:3)
当IVM_partial
完成执行时,weekDelegate
被取消分配 - 您没有强烈引用它,只保留局部变量。唯一一个持有对它的引用的其他类是viewDidLoad
本身(在您的情况下为UICollectionView
),但collectionViewWeeks
将其UICollectionView
定义为delegate
。
这样做是为了让引用保持活着:
weak
答案 1 :(得分:0)
您需要使用UICollectionViewDelegateFlowLayout
,这就是我的创建方式
extension ViewController: UICollectionViewDelegateFlowLayout {
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
var height1: Int
if indexPath.row == 0 {
height1 = 210
} else {
height1 = 400
}
return CGSize(width: 350, height: height1)
}
}