I'm trying to make a reusable UITableView. I will pass in generics for item and UITableViewCell. However am having an error when I try to cast my cell to C and am not sure how else to fix this.
Member 'reusableLoadMoreTableView' cannot be used on value of type 'any SharedLoadMoreTableViewDelegate<T, C>'; consider using a generic constraint instead
protocol SharedLoadMoreTableViewDelegate<T, C>
{
associatedtype T
associatedtype C: UITableViewCell
func reusableLoadMoreTableView(configure cell: C, for item: T)
}
class ReusableLoadMoreTableView<T, C: UITableViewCell>: UIView, UITableViewDelegate, UITableViewDataSource
{
private let tableView = UITableView()
private var items: [T] = []
var delegate: (any SharedLoadMoreTableViewDelegate<T, C>)?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier:"CustomTableViewCell", for: indexPath) as! C
if indexPath.row < items.count
{
delegate?.reusableLoadMoreTableView(configure: cell, for: items[indexPath.row])
}
return cell
}
}
As the compiler suggests, you should consider SharedLoadMoreTableViewDelegate as a generic constraint instead of a type
protocol SharedLoadMoreTableViewDelegate<T, C>
{
associatedtype T
associatedtype C: UITableViewCell
func reusableLoadMoreTableView(configure cell: C, for item: T)
}
class ReusableLoadMoreTableView<LoadMoreT: SharedLoadMoreTableViewDelegate>: UIView, UITableViewDelegate, UITableViewDataSource
{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
0
}
private let tableView = UITableView()
private var items: [LoadMoreT.T] = []
var delegate: LoadMoreT?
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier:"CustomTableViewCell", for: indexPath) as! LoadMoreT.C
if indexPath.row < items.count
{
delegate?.reusableLoadMoreTableView(configure: cell, for: items[indexPath.row])
}
return cell
}
}
Your code is also not compiling in the old version of swift that you are using. Since the implementation of SE-0352, it will compile properly. My advice is to update your swift version by updating XCode version or installing a newer swift installation onto your machine to match or exceed Swift 5.7