ios - `titleForHeaderInSection` 似乎在 iOS 中的 viewDidLoad 之前被调用

Question

我想在标题中添加标题。这些标题将从在 viewDidLoad 中启动的数组中检索，为此我使用了override func titleForHeaderInSection。当我运行我的代码时，该函数似乎被调用得太早了。

我在函数中添加了一个断点，在循环执行代码 3 次后，我能够看到我的 tableviewcontroller。

我还添加了两个打印命令。一个在 viewDidLoad 中，一个在 titleForHeaderInSection 中。你猜怎么着，首先打印了 titleForHeaderInSection 打印内容。

这个函数不应该在viewDidLoad之后调用吗？我的问题如何解决？

代码如下:

override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    print("title")
    for index in tasks.indices{
            print(index)
            if section == index{
                print(tasks[index])
                return tasks[index]
            }
            return "no name specified"
        }
    return ""

}

数组只是一个简单的 [a,b,c,d]，现在第一部分的标题是“a”，其他 3 部分的标题是“未指定名称”

我的 viewDidLoad 方法如下所示:

var taskName = [""]
var dateStamp = [""]
var userId = [""]
var clType = [""]
var tasks = [""]
var count = 0
var countarr = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
var result = false
var dupClType = [""]
var loaded = false
override func viewDidLoad() {
    super.viewDidLoad()

    let query = PFQuery(className:"pendingTasks")
    query.orderByAscending("clType")
    query.findObjectsInBackgroundWithBlock({ (object: [PFObject]?, error: NSError?) in
        if error != nil{

        print ("error")
        } else {
            if let objects = object{
                self.taskName.removeAll(keepCapacity: true)
                self.dateStamp.removeAll(keepCapacity: true)
                self.userId.removeAll(keepCapacity: true)
                self.clType.removeAll(keepCapacity: true)

                for object in objects{
                    if object.objectId != "Q8knzhSDon"{
                    self.taskName.append(object.objectForKey("taskName") as! String)
                    self.dateStamp.append(object.objectForKey("dateStamp") as! String)
                    self.userId.append(object.objectId! as String)
                    self.clType.append(object.objectForKey("clType") as! String)

                }

                }


            }


            self.tasks = Array(Set(self.clType))
            self.tasks.sortInPlace()
            self.loaded = true
            for items in self.tasks.indices{
                self.count=0
            for item in self.clType{
                if item == self.tasks[items]{
                    self.count = self.count + 1
                    self.countarr[items] = self.count

                }
            }

        }

                while self.countarr.last == 0{
                self.countarr.removeLast()

                }

        self.dupClType = self.clType
        }
        self.tableView.reloadData()

    })

    // Uncomment the following line to preserve selection between presentations
    // self.clearsSelectionOnViewWillAppear = false

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
     self.navigationItem.rightBarButtonItem = self.editButtonItem()
}

Answer 1

尝试在viewDidLoad方法中设置UITableView的dataSource和delegate而不是xib。它可能有效，只是猜测。