How to call class init with tuples array parameter in Swift?

Question

I have the follow issue in my code:

class A {
    smth1: [[(Int,Int)]] = [[(1,2),(2,3)],
                            [(3,4),(4,5)]]

    var inst = B(smth2: smth1 [1])
}

class B {
    init (smth2: [(Int,Int)]){
    ...}
}

XCode generate error message: Could not find an overload for 'subscript' that accepts the suplied arguments

Keenle · Accepted Answer · 2014-07-18 15:01:23Z

3

Here is how you should do it:

class A {
    let smth1: [[(Int,Int)]] = [[(1,2),(2,3)],
                                [(3,4),(4,5)]]

    @lazy var inst: B = {
        return B(smth2:self.smth1[1])
    }()
}

You cannot use instance properties before initialization/instantiation. I.e. there is no self hence no way to access smth1 property, even if it is constant.

Alternatively you can declare smth1 as class variable and access without @lazy initialization:

class A {
    class var smth1: [[(Int,Int)]] {
        return [[(1,2),(2,3)],[(3,4),(4,5)]]
    }

    var inst: B = B(smth2:smth1[1])
}

edited Jul 18, 2014 at 15:01

answered Jul 18, 2014 at 14:01

Keenle

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