如何创建一个将弱自身传递到闭包内部的闭包签名

Question

I have created a class called VerifyObject , that contains a function with the following signature

typealias handlerCodeID = (String) ->Void
typealias handlerCode = (Date, Code) ->Void
typealias handlerError = (NSError) ->Void


class func verifyObject(withID:String?,
  runOnEnter: handlerCode?,
  runOnExit: handlerCode?,
  runOnPause: handlerCodeID?,
  runOnError: handlerError?) 

when I run these runOn... closures, I will have situations where I need to use references to self inside the closures, capturing self and creating leaks.

I have read everything I could find about creating weak self on swift but the text is so exoteric that I cannot wrap my head around.

I know the objective-c way but that is considered heresy on swift.

How do I create these typealias or the function signature or whatever to pass a weak self to inside each of these 4 closures.

Please explain like I am 5 years old. Ok, make it 4.

Thanks.

Answer 1

When you call handleCodeID you can pass weak self so you can remove any strong reference cycles.

So when you call verifyObject(...) it will be something like...

Self.verifyObject(“someString”, { [weak self] date, code in 
//runonenter
},
{ [weak self] date, code in
 //runonexit
 }, 
{ [weak self] string in
 //runonpause
 },
{ [weak self] error in
 //runonerrir
})

You can continue this

The typealias doesn't actually contain this, it's something you use when calling the specified typealias or any closure