重载Array类的contains方法

var allFilters = self.filtersContainer?.filters ?? [OpalFilter]()
if let sorter = filtersContainer?.sorter {
    if allFilters.contains ({ (filter: OpalFilter) -> Bool in
        if filter.groupName == sorter.groupName && filter.optionType == sorter.optionType {
            return true
        }
        else {
            return false
        }
    }) == false {
        allFilters.append(sorter)
    }
}