ios - 按委托(delegate)自动存储数据(swift)

Question

class BaseViewController: UIViewController,departmentMenuDelegate{
var deptId1: NSMutableArray = []
var deptSelectedIndexPath : NSIndexPath?
var deptSelectedProfileName : String = ""

func returnDeptId()-> NSMutableArray
{
    return deptId1
}
}

class DepartmentMenuController: UIViewController,,UITableViewDataSource, UITableViewDelegate{
var deptId: NSMutableArray = []

var testing : Int = 0
weak var delegate : departmentMenuDelegate?

override func viewDidLoad() {
    super.viewDidLoad()
    deptId = (delegate?.returnDeptId())!
    deptId = ["suds","sdsds"]
}
}

问题1:当我向DepartmentMenuController中的deptId添加值时，它会自动将值存储到BaseViewController中的deptId中。为什么会发生这种情况？如果我删除 deptId = (delegate?.returnDeptId())!，那么问题就不存在

它只发生在 NSMutableArray 上，而不是其他类型(例如 String)

问题2:正常情况下会发生这种情况吗？我想知道这是我的程序的问题

Answer 1

当您调用委托(delegate)时，您是通过引用传递的。我想这就是您正在寻找的。

class BaseViewController: UIViewController,departmentMenuDelegate{
  var deptId: NSMutableArray = []
  var deptSelectedIndexPath : NSIndexPath?
  var deptSelectedProfileName : String = ""

  func returnDeptId(departmentID: NSMutableArray) -> NSMutableArray {
      for i in 0..<deptId.count {
        departmentID.append(deptId[i] copy)
      }
      return departmentID
  }
}

class DepartmentMenuController: UIViewController, UITableViewDelegate {

  var deptId: NSMutableArray = []
  var testing : Int = 0
  weak var delegate : departmentMenuDelegate?

  override func viewDidLoad() {
      super.viewDidLoad()
      deptId = (delegate?.returnDeptId(deptId))!
      deptId = ["suds","sdsds"]
  }
}