How to delete specific NSObject in Array with Swift3 - arrays

Question

I made table view with friends contact info.
And Each cell has button if touched,
I want to insert the info to selected friend array
(by the array, I made another small view to slide up with the friends list).
But If user the button one more,
I want to delete the friend Info in the selected friend array.
I know how to append to array,
but I don't know how to erase the specific item(NSObject) in array
by not using index.
my source code is below
class FriendModel : NSObject {
dynamic var index : ""
dynamic var thumbnail : ""
dynamic var name : ""
}
and In view controller class,
var selectedList = [FriendModel]()
#IBAction func SelectAct(_ sender: Any) {
let chooseBtn = sender as! UIButton
let indexPath = NSIndexPath(row: chooseBtn.tag, section:0)
let cell = tableView.cellForRow(at: indexPath as IndexPath) as! FriendsListSendCell
// when selected button is pushed
if chooseBtn.isSelected == true {
chooseBtn.isSelected = false
count = count! - 1
if self.count! < 1 {
self.windowShowUp = false
UIView.animate(withDuration: 0.1, delay: 0.1, options: [], animations:{self.selectedBoard.center.y += 80 }, completion: nil)
self.checkNumLabel.text = ""
}else{
}
//////////////////////////here////////////////////////////
//////////////////how to erase the FriendModel(NSObject) in selectedList.
}
//when the unselected button is pushed
else {
//instance for append the friend info
let friendInfo = FriendModel()
chooseBtn.isSelected = true
count = count! + 1
friendInfo.thumbnail = cell.thumbnail
friendInfo.name = cell.nameLabel.text!
//add friend info to selectedList
self.selectedList.append(friendInfo)
print("\(self.selectedList)")
if self.windowShowUp! == false{
self.windowShowUp = true
UIView.animate(withDuration: 0.1, delay: 0.1, options: [], animations:{self.selectedBoard.center.y -= 80 }, completion: nil)
}else{
}
}
}

Answer 1

You can use index(where:) to get index of your object and then remove item at index position.
class FriendModel {
var index = ""
var thumbnail = ""
var name = ""
}
let fm0 = FriendModel()
fm0.index = "100"
fm0.thumbnail = "tell.png"
fm0.name = "Phillips"
let fm1 = FriendModel()
fm1.index = "200"
fm1.thumbnail = "ask.png"
fm1.name = "Allen"
var array = [FriendModel]()
array.append(fm0)
array.append(fm1)
// The index below is an index of the array. Do not confuse with the FriendModel.index
let index = array.index {
return $0.thumbnail == "ask.png" && $0.name == "Allen"
}
array.forEach { print($0.name) }
print("Array index:", index ?? "n/a")
array.remove(at: index!)
array.forEach { print($0.name) }

Answer 2

You could use MirekE's solution which would work but here's an alternative solution.
First step would be identifying what the unique identifier on your FriendModel object is such as an id property.
Then on your model, since it is an NSObject, override the isEqual function like this:
override public func isEqual(object: AnyObject?) -> Bool {
let friend = object as? FriendModel
if self.id == friend?.id { return true }
return false
}
At this point you can use your desired form of iteration to find your element in the array and use remove.