When you use self, does it only relate to the instance that it is indented in?

A great use would be use self within brackets of the enum class to refer to its own members to simplify your code. Imagine you and your friend have a phone. In code it would look like this.

enum Phone: Double { case IPhone = 9.1 , GalaxyS3 = 8.8, Blackberry = 6.2 }

var myPhone = Phone.IPhone var friendsPhone = Phone.GalaxyS3

Here's what I'm talking about. If you want to know who's phone is better, you would need to create a method in the enum like shown below. (I give an example with and without the use of self. notice the parameters.)

enum Phone: Double { case IPhone = 9.1 , GalaxyS3 = 8.8, Blackberry = 6.2

//Example Without Self
func phoneAnalyzer (myPhone: Phone, friendsPhone: Phone)  -> String{
    if (myPhone.rawValue > friendsPhone.rawValue){
    return "Your Phone is Better"}
    else {
    return "Your friends phone is better"}
}
// the method call would be myPhone.phoneAnalyzer(myPhone, friendsPhone)

//With Self
func phoneAnalyzer (friendsPhone: Phone)  -> String{ //notice more parameters here
    if (self.rawValue > friendsPhone.rawValue){
    return "Your Phone is Better"}
    else {
    return "Your friends phone is better"}

} //Method call with self is myPhone.phoneAnalyzer(friendsPhone) // Less parameters, less redundancy, better readability

You use self to refer to the instance you are working in.