I'm creating a custom refresh control and I need to get some UIScrollViewDelegate methods from the UITableViewController,
What I was doing before is creating implementing UIScrollViewDelegate into my CustomRefreshControl and just overriding scrollViewMethods and passing the all the values inside my customRefresh control, but this approach is a bit ugly and not practical since I would have to do it for every class that applies this CustomRefreshControl so I tried to solve it with protocol extensions but it's not working...
class CustomRefreshControl: UIView {
// initializer and all other properties here
// ...
}
extension CustomRefreshControl: UIScrollViewDelegate {
// Here my implementation inside custom refresh control so I can make it behave like I intend,
// But since all scroll methods from UITableViewController are called in the controller itself and I could not figure out a way to send these events directly into my customRefresh
// I implemented these methods here and just passing them from controller to my customRefresh
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
// doing some calculations here
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
// doing some calculations here
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
// doing some calculations here
}
}
How I was doing before on viewController side...
class RefreshingTableViewController: UITableViewController {
lazy var configuration: CustomRefreshControl.Configurations = {
return CustomRefreshControl.Configurations(threshold: 160, scrollView: self, refreshAction: refreshData)
}()
lazy var refresh = CustomRefreshControl(configurations: configuration)
// All other properties and delegate and datasource implementations
//...
}
extension RefreshingTableViewController {
// That was my previous implementation But this solution did please so much
// Because I have to implement this in every single viewController that wants to use this CustomRefreshControl
override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
refresh.scrollViewWillBeginDragging(scrollView)
}
override func scrollViewDidScroll(_ scrollView: UIScrollView) {
refresh.scrollViewDidScroll(scrollView)
}
override func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
refresh.scrollViewWillEndDragging(scrollView, withVelocity velocity: velocity, targetContentOffset: targetContentOffset)
}
}
So the solution I'm trying to make work right now is a solution with protocols, but I don't know if it's even possible, it is as follows...
protocol CustomRefreshManagerProtocol where Self: UIScrollViewDelegate {
var customRefresh: CustomRefreshControl { get }
}
extension CustomRefreshManagerProtocol {
// Here I'm trying to implement the UIScrollViewDelegate methods, since I specifing that Self: UIScrollViewDelegate I thought it might work
// But none of these functions are being called, so that's what I'm trying to get to work without success.
func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
customRefresh.scrollViewWillBeginDragging(scrollView)
}
func scrollViewDidScroll(_ scrollView: UIScrollView) {
customRefresh.scrollViewDidScroll(scrollView)
}
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
customRefresh.scrollViewWillEndDragging(scrollView, withVelocity: velocity, targetContentOffset: targetContentOffset)
}
}
class RefreshingTableViewController: UITableViewController, CustomRefreshManagerProtocol {
lazy var refresh = CustomRefreshControl(configurations: configuration)
var customRefresh: CustomRefreshControl { refresh }
// ...
}
Anyone has any idea how to make this work or why it's not working?
