ios - Swift - 未设置默认属性值

Question

为什么属性没有用默认值初始化？如果我取消注释

//    required init?(coder aDecoder: NSCoder)
//    {
//        super.init(coder: aDecoder)
//    }

一切正常。

更新:

看起来问题与泛型类型“Element”有关，以下代码按预期工作:

import UIKit

class ANTableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate
{
    @IBOutlet weak var tableView: UITableView!
    var sections: [[SPMenuItem]] = [[SPMenuItem]]()
    var a = "qwe"

    var configureCellBlock : ((UITableView, NSIndexPath, SPMenuItem) -> UITableViewCell)!
    var didSelectElementBlock : ((SPMenuItem) -> Void) = { (element) -> Void in }

    func elementForIndexPath(indexPath: NSIndexPath) -> SPMenuItem
    {
        let elements = sections[indexPath.section]
        let element = elements[indexPath.row]

        return element
    }

//    required init?(coder aDecoder: NSCoder)
//    {
//        super.init(coder: aDecoder)
//    }

    // MARK: - UITableViewDataSource

    func numberOfSectionsInTableView(tableView: UITableView) -> Int { return sections.count }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return sections[section].count }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
    {
        let element = elementForIndexPath(indexPath)

        assert(configureCellBlock != nil, "configureCellBlock should not be nil!")

        let cell = configureCellBlock(tableView, indexPath, element)

        return cell
    }
}

Answer 1

First declear like this later you just add (or) initilize the data

 var sections: [[Element]]?