Swift nested class properties

Question

Does swift not have nested classes??

For example, I can\'t seem to access the property test of the master class from the nested class.

class master{         


        

Answer 1

This solution is sort of similar to how I use it in C#, and I have successfully tested it in Xcode.

Here's a breakdown of the process:

1. Your nested class needs to be made optional so you don't have to initialize it, so theres a '?' in the declaration; if you initialize both your parent class and your nested class, you end up with a 'recursion' effect and an error is generated
2. Create a regular function that receives an argument of the same type as your main class
3. Pass that argument to your nested class (this can go into the nested object's normal initializer). - Since objects are passed by reference by default, there's nothing special to get your nested class to link to the parent class
4. Inside your nested class, you need a variable of the same type as your parent class

From here on out set up everything as you normally would.

In the code execution area, your nested class object also needs to be regarded as optional (hence the '?'). If you forget about it, Xcode will add it anyways.

In this example, I wanted to design a keyword "set," so when I set variables, I can type:

testClass.set.(and then a descriptive method name)

Here is the code, and its goal is to output "test" in the console, after the value is set via the nested object:

class testClass
{
    var test_string:String = ""
    var set: class_set?

    func construct_objects(argument: testClass)
    {
        self.set = class_set(argument: argument)
    }
    class class_set
    {
        var parent:testClass
        init(argument: testClass)
        {
            parent = argument
        }
        func test_string_to_argument(argument: String)
        {
            parent.test_string = argument
        }
    }
}
var oTestClass = testClass()
oTestClass.construct_objects(oTestClass)
oTestClass.set?.test_string_to_argument("test")
print(oTestClass.test_string)