swift tableview how to select all rows

Question

I have Button in tableview I want when I press that button will select all cell rows, how to do that? I tried alot but I got nothing

I\'m so confused how to make the but

Answer 1

var isSelectAll = false; //global variable

isSelectAll = true;//on button action
self.tableView.reloadData()//on button action

in cellForRowAtIndexPath method

if(isSelectAll==true)
{
cell.backgroundColor = UIColor.blueColor();
}
else
{
cell.backgroundColor = UIColor.white();
}