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iOS

Posted by Anthony Babich
Anthony Babich
5,505 Points

Why would you write a protocol with a var but make it { get } and not { get set }

I think the question is straight forward. I'm confused. So in some of the iOS Swift 2.0 videos I've seen the instructor create a protocol with a variable but mark it as { get }

Isn't { get } read only? So wouldn't { get } always be a constant of let declaration?

3 Answers

garyguermantokman
garyguermantokman
21,097 Points

Hey,

In short, property requirements are always declared as variables.

This is defined in the Swift Programming Language.

Check out the protocol docs to learn more Apple Protocol docs

jcorum
jcorum
71,830 Points
jcorum
jcorum
71,830 Points

Anthony, here's another bit from the Apple documentation:

Read-Only Computed Properties

A computed property with a getter but no setter is known as a read-only computed property. A read-only computed property always returns a value, and can be accessed through dot syntax, but cannot be set to a different value.

NOTE You must declare computed properties—including read-only computed properties—as variable properties with the var keyword, because their value is not fixed. The let keyword is only used for constant properties, to indicate that their values cannot be changed once they are set as part of instance initialization.

https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Properties.html

Anthony Babich
Anthony Babich
5,505 Points
Anthony Babich
Anthony Babich
5,505 Points

Thanks a lot for the responses. I do enjoy treehouse but I wish similarly to the Swift tutorials that they would start from scratch instead of throwing all this crap at me all at once. There's just so much!!!.... So, until I figure out why I feel so confused I am going to read the documentation. Thanks a lot.