open and close "Title 2", then the sub items in "Title 3" get darken by "cell.backgroundColor = UIColor.lightGrayColor()"
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 4"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 5"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 6"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 4"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 5"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 6"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 7"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 8"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 4"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 5"))
open "Title 3" and click "sub item 2", then open "Title 2" and click "sub item 8". both "Title 2 - sub item 8" and "Title 3 - sub item 2" are checked
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 4"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 5"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 6"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 4"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 5"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 6"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 7"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 8"))
self.cells.append(SwiftyAccordionCells.HeaderItem(value: "Title 3"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 1"))
self.cells.append(SwiftyAccordionCells.Item(value: "Sub Item 2"))