LeakTest2

LeakTest.swift

// define object
class LeakObject: NSObject {
    var node:LeakObject?
    var name:String = ""
    init(_ name:String) {
        super.init()
        self.name = name
        
        self.name == "" ? () : print("Init object - \(self.name)")
    }
    
    deinit {
        self.name == "" ? () : print("Dealloc object - \(self.name)")
    }
}

// Demo
var obj1 = LeakObject("Obj 1")
weak var obj2 = LeakObject("Obj 2")

obj1.node = obj2
obj2?.node = obj1

obj1 = LeakObject("")
obj2 = LeakObject("")

// output
// Init object - Obj 1
// Init object - Obj 2
// Dealloc object - Obj 2
// Dealloc object - Obj 1