Answer by Buntylm for Defining 'UITableViewCell' variable in Swift 2.0

Because the non optional type cannot be compared with nil (Only optional variables contains nil value). Like if you want to check nil then just use that way. i implemented it in Playground

let tableView = UITableView()
let index = NSIndexPath()
var cell:UITableViewCell! = tableView.dequeueReusableCellWithIdentifier("")
//then make check for nil if you want
if (cell == nil) {
    print("its nil")
} else  {
    print("not nil")
}