Swift readonly external, readwrite internal property

Question

In Swift, what is the conventional way to define the common pattern where a property is to be externally readonly, but modifiable internally by the class (and subclasses) th

Answer 1

As per @Antonio, we can use a single property to access as the readOnly property value publicly and readWrite privately. Below is my illustration:

class MyClass {

    private(set) public var publicReadOnly: Int = 10

    //as below, we can modify the value within same class which is private access
    func increment() {
        publicReadOnly += 1
    }

    func decrement() {
        publicReadOnly -= 1
    }
}

let object = MyClass()
print("Initial  valule: \(object.publicReadOnly)")

//For below line we get the compile error saying : "Left side of mutating operator isn't mutable: 'publicReadOnly' setter is inaccessible"
//object.publicReadOnly += 1

object.increment()
print("After increment method call: \(object.publicReadOnly)")

object.decrement()
print("After decrement method call: \(object.publicReadOnly)")

And here is the output:

  Initial  valule: 10
  After increment method call: 11
  After decrement method call: 10