CODEWITHSUNDEEP
iosswiftios8
user1107173
user1107173

Reputation: 10764

Swift: Cannot invoke 'append' with an argument list of type

Two Classes:

import UIKit
struct ListSection {
    var rows : [ListRow]?
    var sectionTitle : String?
}


import UIKit
struct ListRow {
    var someString: String?
}

Now when I try to append:

var row = ListRow()
row.someString = "Hello"

var sections = [ListSection]()
sections[0].rows.append(row) // I get the following error:
//Cannot invoke 'append' with an argument list of type (ListRow)'

If I try this:

sections[0].rows?.append(row) // I get the following error:
//Will never be executed

How do I append to rows in section[0]?

Upvotes: 1

Views: 2289

Answers (3)

Eric Aya
Eric Aya

Reputation: 70110

You need to at least have one ListSection in your sections array, but you also need the rows array in each ListSection to be initialized or empty instead of a nil Optional.

struct ListRow {
    var someString: String?
}

struct ListSection {
    var rows = [ListRow]()
    var sectionTitle : String?
}

var row = ListRow()
row.someString = "Hello"

var sections = [ListSection]()

sections.append(ListSection())

sections[0].rows.append(row)

Upvotes: 1

Leo
Leo

Reputation: 24714

You need to add a ListSection to the sections array first

    var sections = [ListSection]()
    var firstSection = ListSection(rows:[ListRow](), sectionTitle:"title")
    sections.append(firstSection)

    var row = ListRow()
    row.someString = "Hello"
    sections[0].rows!.append(row)

Upvotes: 1

MirekE
MirekE

Reputation: 11555

Start with fixing the sections[0] problem: There is no sections[0] at the time you attempt to access it. You need to append at least one section before accessing sections[0].

Upvotes: 1

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