Explain the purpose of the self initialization syntax such as
init(distance: Double) {
self.distance = distance
}
In swiftui when I initialize distance I normally just say
init () {
var distance = 5
}
It seems like the first example doesn’t do anything useful
@galensmith Thanks very much for your question!
In the line:
self.distance = distance
self.distance
is referring a declared property that is contained within that class, while
= distance is referring to the property being passed in at the time of instantiation.
init(distance: Double) {
self.distance = distance
}
The self identifier indicates a reference to the class where it is being used. So if this code is declared inside a class called, “MyViewController”, then
self is a reference to MyViewController.
SwiftUI is a different beast, and so many things done in UIKit are simplified in SwiftUI, which means shorter syntax 
I hope this helps!
All the best.
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