ios - Swift:无法使用类型的参数列表调用 'append'

Question

两个类:

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


import UIKit
struct ListRow {
    var someString: String?
}

现在当我尝试追加时:

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)'

如果我尝试这样做:

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

如何追加到 section[0] 中的 rows？

Answer 1

你需要先添加一个ListSection到sections数组

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

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