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Swift: Declare in an extension that an array of a type conforms to a protocol


Swift: Declare in an extension that an array of a type conforms to a protocol

By : Bruno Ricardo Silva
Date : November 22 2020, 02:59 PM
help you fix your problem if I understand correctly what you want to do and you have to call the protocol method like this:
code :
let testArray: [String] = ["str1", "str2", "str3"]
testArray.protocolMethod()
extension CollectionType where Generator.Element: Validates {
    ...
}


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Swift extension that conforms to protocol

Swift extension that conforms to protocol


By : user2142491
Date : March 29 2020, 07:55 AM
wish of those help Please double check in your extension that you've implemented all of the methods defined in the protocol. If function a is not implemented, then one will get the compiler error that you listed.
code :
protocol SomeProtocol {
    func a()
}

extension UIView : SomeProtocol {
    func a() {
        // some code
    }
}
Protocol Extension in Swift Where Object Is a Class and conforms to a Protocol

Protocol Extension in Swift Where Object Is a Class and conforms to a Protocol


By : Papiya Kawsar
Date : March 29 2020, 07:55 AM
Hope this helps I have two protocols (Archivable and Serializable) and a class (Model) that is subclassed multiple times. Many of the subclasses implement either Archivable or Serializable (or both). I'd like to define a function on all children of Model that implement both Archivable and Serializable. Both of these work: , I think this should work:
code :
extension Archivable where Self: Model, Self: Serializable {

    func fetch() { ... }

}
extension Serializable where Self: Model, Self: Archivable {

    func fetch() { ... }

}
Declare metatype that is a subclass and conforms to a protocol in Swift 4

Declare metatype that is a subclass and conforms to a protocol in Swift 4


By : ferdoush10
Date : March 29 2020, 07:55 AM
hop of those help? To declare a type that is a subclass and conforms to a protocol in Swift 4 you can use this syntax:
code :
var classForCell: (UICollectionViewCell & AdditionalHeightable).Type
Heterogeneous array that conforms to protocol with associated type in Swift

Heterogeneous array that conforms to protocol with associated type in Swift


By : ainwood
Date : March 29 2020, 07:55 AM
will help you I have a protocol AProtocol with an associated type AType and a function aFunc. I want to extend Array such that it conforms to the protocol by using the result of its elements aFunc function. Clearly this is only possible if elements of the array conform to Aprotocol and have the same associated type so I have set this toy example: , See if this fits your needs.
Approach:
code :
protocol BProtocol {
    func aFunc(parameter: BProtocol) -> Bool
}

extension String : BProtocol {
    func aFunc(parameter: BProtocol) -> Bool {
        return true
    }
}

extension Int : BProtocol {
    func aFunc(parameter: BProtocol) -> Bool {
        return false
    }
}

extension Array : BProtocol where Element == BProtocol {

    func aFunc(parameter: BProtocol) -> Bool {
        return self.reduce(true, { r,e in r || e.aFunc(parameter: parameter) })
    }
}
let a1 : [BProtocol] = [1, 2, 3, "Hi"]

let boolean = a1.aFunc(parameter: 1)
Declare a variable or constant that conforms to a protocol in Swift

Declare a variable or constant that conforms to a protocol in Swift


By : flat5
Date : March 29 2020, 07:55 AM
I wish this helpful for you There is no such necessary to do such thing, because when you declare the type of your variable (or constant), it should be known if it is conforming a protocol or not. But in case sometimes you are using legacy objc id, you may get an AnyObject. In that situation, you can just do a downcast to convert it as a protocol type and use it.
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