Swift - Trailing Closure Syntax

Question

I'm diving into Swift lang by Apple and have some problems using the trailing closure syntax, example:

func test(txt: String, resolve: (name: String) -> Void) { resolve(name: "Dodo") } // Errors here complaining on resolve param test("hello", (name: String) { println("callback") })

How to fix it?

Christian Dietrich · Accepted Answer · 2014-06-16 17:50:05Z

27

you have the wrong closure syntax

test("hello", {(name: String) in println("callback") })

or

test("hello", { println("callback: \($0)") })

or

test("hello") {(name: String) in println("callback") }

or

test("hello") { println("callback: \($0)") }

edited Jun 16, 2014 at 17:50

answered Jun 16, 2014 at 17:40

Christian Dietrich

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4 Comments

Kosmetika Over a year ago

I have one more question, this resolve(name: name) throws an error use of unresolved identifier 'name'.. how to pass arguments in callback call?

Christian Dietrich Over a year ago

hi i dont get that. can you share the code that fails?

jmg Over a year ago

I have a question... In the first code example that you provided above, you have "{(name: String) in". What's the semantic meaning of "in" when used in this context?

Christian Dietrich Over a year ago

In is the separator between parameters and statements

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