Uitableview

UI TableView

Initialization¶

Delegates¶

Customizability¶

DataSource¶

Diffable DataSource¶

UITableViewDiffableDataSource

https://medium.com/@ali-akhtar/uitableview-diffable-datasource-part-1-13a24e8f23d8

Extension¶

Unselecting the selected tableview

SO

import UIKit

extension UITableView {

    func deselectSelectedRow(animated: Bool)
    {
        if let indexPathForSelectedRow = self.indexPathForSelectedRow {
            self.deselectRow(at: indexPathForSelectedRow, animated: animated)
        }
    }

}

Reusability¶

Properly reset the attributes of the table view cell so that it doesn’t take a performance hit even when using “prepareToReuse” method call.

Apple docs prepareToReuse

duplicate cells

Errors¶

Constraints Error¶

Warning: Detected a case where constraints ambiguously suggest a height of zero SO

Footer Empty cell¶

SO

Show UITableView footer when empty SO

Updates¶

iOS 15 TableViewCell reconfigure UITableView: reconfigure

Programmatic UITableView https://martinlasek.medium.com/tutorial-adding-a-uitableview-programmatically-433cb17ae07d

Delegates¶

With Sections in the TableView Row. Source Model definition

struct IDataSource {
    let sections = [
        IDataSourceSection(
            title: "age",
            items:
            [IDataSourceItem(displayTitle: "Files",
            valueDisplayer: .delayed(storageType: .file))
             ]),
        IDataSourceSection(
            title: "Mie",
            items:
            [IDataSourceItem(displayTitle: "BT",
            valueDisplayer: .other))
             ])
      ]
    func getItem(at indexPath: IndexPath) -> InfoDataSourceItem? {
        return sections.element(at: indexPath.section)?.items.element(at: indexPath.row)
    }
}

Table View Delegate methods

class IViewController: UITableViewController { }
private let iDataSource = IDataSource()

// Section
public override func numberOfSections(in tableView: UITableView) -> Int {
        return iDataSource.sections.count
}
// Row
public override func tableView(_ tableView: UITableView,
                                   numberOfRowsInSection section: Int) -> Int {
    return iDataSource.sections.element(at: section)?.items.count ?? 0
}

// Header
public override func tableView(_ tableView: UITableView,
                     titleForHeaderInSection section: Int) -> String? {
    return iDataSource.sections.element(at: section)?.title ?? ""
}
// Cell configure
public override func tableView(_ tableView: UITableView,
                    cellForRowAt indexPath: IndexPath) -> UITableViewCell {
   guard let cell = tableView.dequeueReusableCell(withIdentifier: identifier) as? CustomUITableViewCell else { return UITableViewCell() }
   guard let item = iDataSource.getItem(at: indexPath) else {return cell }
   return cell
}