Touches

touches.swift

var allTouches: [UITouch] = []
func add(_ touches: Set<UITouch>) -> [UITouch] {
    for newTouch in touches {
        var exist = false
        for oldTouch in allTouches {
            if oldTouch == newTouch {
                exist = true
                break
            }
        }
        if !exist {
            allTouches.append(newTouch)
        }
    }
    return allTouches
}
func remove(_ touches: Set<UITouch>) -> [UITouch] {
    for newTouch in touches {
        for (i, oldTouch) in allTouches.enumerated() {
            if oldTouch == newTouch {
                allTouches.remove(at: i)
                break
            }
        }
    }
    return allTouches
}