在 iOS 15 表格视图中滚动到顶部

Question

How do you scroll to the top of a table view in iOS 15? In previous versions, I was using the -scrollToTop<\/code> method, but in iOS 15 this scrolls past the padding of the first table section header.

"

Answer 1

UITableViews does not contain any method called 'scrollToTop' or 'scrollToBottom' but you can create an extension for tableview and create these methods :

extension UITableView {

    func scrollToBottom(isAnimated:Bool = true){

        DispatchQueue.main.async {
            let indexPath = IndexPath(
                row: self.numberOfRows(inSection:  self.numberOfSections-1) - 1,
                section: self.numberOfSections - 1)
            if self.hasRowAtIndexPath(indexPath: indexPath) {
                self.scrollToRow(at: indexPath, at: .bottom, animated: 
                isAnimated)
            }
         }
     }

    func scrollToTop(isAnimated:Bool = true) {

        DispatchQueue.main.async {
            let indexPath = IndexPath(row: 0, section: 0)
            if self.hasRowAtIndexPath(indexPath: indexPath) {
                self.scrollToRow(at: indexPath, at: .top, animated: 
                isAnimated)
            }
        }
    }

    func hasRowAtIndexPath(indexPath: IndexPath) -> Bool {
        return indexPath.section < self.numberOfSections && 
        indexPath.row < self.numberOfRows(inSection: indexPath.section)
    }
}