使用协议/委托并从didSelectItemAt(collectionViews)中检索数据。
// This class have the data
// WhereDataIs: UICollectionViewController
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
//Pass some data from the didSelect to a delegate
let test = things[indexPath.item]
guard let bingo = test.aThing else { return }
print("bingo: ", bingo)
那个宾果游戏正在打印我需要的值。很好,就在那里。
现在,我不能在该函数内部使用协议的方法,因为执行不正确,因此编译器或Xcode会说,嘿,您将方法声明为常规方法,而不是嵌套方法。
//Bridge
protocol xDelegate {
func x(for headerCell: HeaderCell)
}
//This is the class that need the data
//class HeaderCell: UICollectionViewCell
var xDelegate: xDelegate?
//it's init()
override init(frame: CGRect) {
super.init(frame: frame)
let sally = WhereDataIs()
self.xDelegate = sally
xDelegate?.x(for: self)
}
// This extension is added at the end of the class WhereDataIs()
// Inside of this class is it's delegate.
var xDelegate: xDelegate? = nil
extension WhereDataIs: xDelegate {
func x(for headerCell: HeaderCell) {
//Smith value will work because it's dummy
headerCell.lbl.text = "Smith"
// What I really need is instead of "Smith" is the value of didselectItemAt called bingo.
headerCell.lbl.text = bingo
}
}
想要在这方面引导我的任何人,帽子都关闭了。
答案 0 :(得分:1)
不使用委托,但可以使用
解决者:
1)转到collectionView的控制器。制作一个新变量来存储项目。
// Pass the item object into the xController so that it can be accessed later.
//(didSelectItemAt)
xController.newVar = item
//xController class: UICollectionView...
// MARK: - Properties
var newVar: Thing?
最后,在该类中,您应该具有方法 viewForSupplementaryElementOfKind ,在其中注册HeaderCell,然后仅添加...
let header = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: headerId, for: indexPath) as! HeaderCell
header.lbl.text = newVar.whatEverYourDataIs
通用性很小,但可以。 :)
答案 1 :(得分:0)
我认为您可以将其添加到didSelectItemAt indexPath
中当前代码的末尾:
guard let header = collectionView.supplementaryView(forElementKind: "yourElementKind", at: indexPath) as? HeaderCell else { return }
header.lbl.text = bingo
collectionView.reloadData()
编辑:现在保留所有其他内容,以确保您首先获得良好的结果。
让我知道这是否可行,很高兴回来查看。