Accepting a callback to a function as param

Question

I am using SnapKit and I am trying to pass the closure as a param to my function which calls snp_makeConstaints like below,

func drawView(view: UIView, callback: (() -> Void)!) {
    self.addSubview(view)
    view.snp_makeConstraints(closure: callback)
}

I am getting the following error,

../example.swift:57:43: Cannot convert value of type '(() -> Void)!' to expected argument type '@noescape (make: ConstraintMaker) -> Void'

Therefore I added (make: ConstaintMaker) -> Void

which resulted in the following error, Use of undeclared type 'ConstraintMaker'

I do not understand what @noescape is and why it is saying that ConstraintMaker is undeclared.

Because snp_makeConstraints expects (make: ConstraintMaker) -> Void and you are trying to pass () -> Void? — sliwinski.lukas, Feb 10 '16 at 08:16
@sliwinski.lukas When I add (make: ConstraintMaker) it shows the following error, `Use of undeclared type 'ConstraintMaker'` — Nagendra Rao, Feb 10 '16 at 08:17
You have to import some module. Check for SnapKit documentation which one. — sliwinski.lukas, Feb 10 '16 at 08:19
I have included the module, I am also able to use it directly but not able to pass as callback to my method. — Nagendra Rao, Feb 10 '16 at 08:21
@sliwinski.lukas My bad, I had included the module in the main file but not in the file I was writing the function in. — Nagendra Rao, Feb 10 '16 at 08:25

score 0 · Answer 1 · answered Feb 10 '16 at 20:24

0

Add import SnapKit on the top of the swift file where you have the problem.

answered Feb 10 '16 at 20:24

sliwinski.lukas

1 Answers1