How to populate UITableView from the bottom upwards?

To populate UITableView from the bottom:

- (void)updateTableContentInset {    NSInteger numRows = [self.tableView numberOfRowsInSection:0];    CGFloat contentInsetTop = self.tableView.bounds.size.height;    for (NSInteger i = 0; i < numRows; i++) {        contentInsetTop -= [self tableView:self.tableView heightForRowAtIndexPath:[NSIndexPath indexPathForItem:i inSection:0]];        if (contentInsetTop <= 0) {            contentInsetTop = 0;            break;        }    }    self.tableView.contentInset = UIEdgeInsetsMake(contentInsetTop, 0, 0, 0);}

To reverse the order of elements:

dataSourceArray = dataSourceArray.reverseObjectEnumerator.allObjects;

Swift 4.2/5 version:

func updateTableContentInset() {    let numRows = self.tableView.numberOfRows(inSection: 0)    var contentInsetTop = self.tableView.bounds.size.height    for i in 0..<numRows {        let rowRect = self.tableView.rectForRow(at: IndexPath(item: i, section: 0))        contentInsetTop -= rowRect.size.height        if contentInsetTop <= 0 {            contentInsetTop = 0            break        }    }    self.tableView.contentInset = UIEdgeInsets(top: contentInsetTop,left: 0,bottom: 0,right: 0)}

Swift 3/4.0 version:

self.tableView.contentInset = UIEdgeInsetsMake(contentInsetTop, 0, 0, 0)

first reverse uitableview

    tableView.transform = CGAffineTransformMakeScale (1,-1);

then reverse cell in cell create.

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;    ...    cell.contentView.transform = CGAffineTransformMakeScale (1,-1);

Swift 4.0 and 4.2 version

First reverse UITableView in viewDidLoad

override func viewDidLoad() {        super.viewDidLoad()        tableView.transform = CGAffineTransform(scaleX: 1, y: -1)}

Then reverse the cell in cellForRowAt.

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {        guard let cell = tableView.dequeueReusableCell(withIdentifier: "MyTableViewCell", for: indexPath) as? MyTableViewCell else { fatalError() }        cell.contentView.transform = CGAffineTransform(scaleX: 1, y: -1)        return cell    }