Check out example codes for "swift uitableview insert cell". It will help you in understanding the concepts better.

Code Example 1

self.yourArray.append(msg)

self.tblView.beginUpdates()
self.tblView.insertRows(at: [IndexPath.init(row: self.yourArray.count-1, section: 0)], with: .automatic)
self.tblView.endUpdates()

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