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In Swift 2.0, how can I do the equivalent of @property (nonatomic, strong) NSManagedObject*<SomeProtocol> model?
Basically, I’m trying to define a property on my class that must both be a subclass of NSManagedObject AND conform to SomeProtocol (I will be calling methods defined by both).
I saw this: https://stackoverflow.com/a/25826948/363789, but I'm not sure how I can apply this syntax to property definition...
857
A protocol can have properties as well as methods that a class, enum or struct conforming to this protocol can implement. A protocol declaration only specifies the required property name and type. It doesn't say anything about whether the property should be a stored one or a computed one.
It aims to ensure that neighbours exchange sufficient information in a timely manner to minimise the scope for disputes between them; and to enable any such disputes to be readily resolved, including by alternative disputes resolution (ADR), keeping costs to a minimum.
A protocol can require any conforming type to provide an instance property or type property with a particular name and type. The protocol doesn't specify whether the property should be a stored property or a computed property—it only specifies the required property name and type.
You can create objects from classes, whereas protocols are just type definitions. Try to think of protocols as being abstract definitions, whereas classes and structs are real things you can create.
This is now possible in Swift 4 using the following syntax:
var myObject: NSManagedObject & SomeProtocol
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