CODEWITHSUNDEEP
swiftfunctionclosures
user1960970
user1960970

Reputation: 157

Swift, How to pass multiple type of closure?

func test1(user: String, completion: @escaping (TestModel) -> Void) {
    test2(user: "test", completion: completion as! (Any) -> Void //failed here)
}

func test2(user: String, completion: @escaping (Any) -> Void) {
    completion(user)
}

I want to pass test1's closure to test2, but test2's closure may have multiple type, it get error when run, EXC_BAD_INSTRUCTION

Is it passable to do this?

Upvotes: 1

Views: 991

Answers (2)

PGDev
PGDev

Reputation: 24341

completion in the above method must take an argument of type T. So anything that you use as an argument to completion must also be of type T. So user must be of type T, i.e.

func test<T>(user: T, completion: @escaping (T) -> Void)
{
    completion(user)
}

Upvotes: 1

matt
matt

Reputation: 535306

This is a misuse of a generic. If you don't care what type is used as the argument to completion, type its parameter as Any:

func test(user: String, completion: @escaping (Any) -> Void) {
    completion(user)
}

Upvotes: 1

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