Compile error being caused when using NSLayoutConstraint

Question

My code is not compiling when I am using NSLayoutConstraint. I am trying to do everything with code and not using storyboard. I dont know if this is happening because I am missing something but it is nothining I can think of right now of why this is not working. The error is occurring in the viewDidLoad function at the judo = line.

I am getting the error:

Cannot assign value of type '[()]' to type '[NSLayout

for the judo = [] part.

import UIKit

class ViewController: UIViewController {
    var Judo1 = [NSLayoutConstraint]()
    let FIRE = UIImageView()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(FIRE)
        FIRE.translatesAutoresizingMaskIntoConstraints = false
        let leadingc2 = FIRE.topAnchor.constraint(equalTo: view.topAnchor, constant: 0).isActive = true
        let trailingC2 =  FIRE.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0).isActive = true
        let topc2 =
            FIRE.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0).isActive = true
        let bottomc2 =   FIRE.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0).isActive = true

        Judo1 = [leadingc2,trailingC2,topc2,bottomc2]

        NSLayoutConstraint.activate(Judo1)
    }
}

Answer 1

When you append

 .active = true

no constraint returns so make them without .active = true as the return is void in this case

FIRE.translatesAutoresizingMaskIntoConstraints = false
let leadingc2 = FIRE.topAnchor.constraint(equalTo: view.topAnchor, constant: 0)
let trailingC2 =  FIRE.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: 0)
let topc2 =   FIRE.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 0)
let bottomc2 = FIRE.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: 0)  
judo1 = [leadingc2,trailingC2,topc2,bottomc2] 
NSLayoutConstraint.activate(judo1)

A better way to use what apple recommends ( if you don't need a reference )

NSLayoutConstraint.activate ([

   FIRE.topAnchor.constraint(equalTo: view.topAnchor),
   FIRE.bottomAnchor.constraint(equalTo: view.bottomAnchor),
   FIRE.leadingAnchor.constraint(equalTo: view.leadingAnchor),
   FIRE.trailingAnchor.constraint(equalTo: view.trailingAnchor)

 ])

Also when constant is zero , get rid of it