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Looks like weak references will be disallowed in protocols. So what am I supposed to do if I wanna add a weak reference? Any better idea?
protocol PipelineElementDelegate: class {
func someFunc()
}
protocol PipelineElement {
weak var delegate: PipelineElementDelegate? { get set}
}
634
In Swift, a protocol defines a blueprint of methods or properties that can then be adopted by classes (or any other types). We use the protocol keyword to define a protocol. For example, protocol Greet { // blueprint of a property var name: String { get } // blueprint of a method func message() }
Protocols can be used for both reference types (classes) and value types (structs, enums). So in the likely case that you need to make a delegate weak, you have to make it an object-only protocol. The way to do that is to add AnyObject to the protocol's inheritance list.
Simply remove the weak keyword from the protocol and declare the property as weak in the conforming type instead:
class SomeClass: PipelineElement {
weak var delegate: PipelineElementDelegate?
}
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