phlippieb · March 15, 2019 06:57 · Mar 15, 2019
diff --git a/ResizingTableViewCellDelegate.swift b/ResizingTableViewCellDelegate.swift
@@ -0,0 +1,46 @@
+/*
+This code demonstrates a way to get UITableViewCells to resize
+after their content size has changed, without needing to reload
+the cells.
+
+Prerequisites:
+- The table view must be set up to calculate its cell heights dynamically; i.e.
+  tableView.rowHeight = UITableView.automaticDimension
+  tableView.estimatedRowHeight = 100 // or some good estimate
+- The cell must be laid out using auto layout. Remember to add the subviews to 
+  the cell's contentView.
+*/
+
+
+
+protocol ResizingTableViewCellDelegate: class {
+  func resizeTableViewCells()
+}
+
+extension UITableView: ResizingTableViewCellDelegate {
+  func resizeTableViewCells() {
+    self.beginUpdates()
+    self.endUpdates()
+  }
+}
+
+// How to use:
+
+class MyTableViewCell: UITableViewCell {
+  // In your tableView(:cellForRowAt:), after the cell
+  // is dequeued, do `cell.delegate = tableView`
+  weak var delegate: ResizingTableViewCellDelegate
+
+  // Add your subviews and dynamic layout here...
+
+  // Call this when the cell content or size changes.
+  private func resize() {
+    // Animate the layout change:
+    UIView.animateWithDuration(0.3) {
+     cell.contentView.layoutIfNeeded()
+    }
+
+    // Ask the delegate (i.e. the tableview) to resize the cell:
+    self.delegate?.resizeTableViewCells()
+  }
+}