Question

我想在标题中添加标题。这些标题将从viewDidLoad中启动的数组中检索出来，我使用了override func titleForHeaderInSection。当我运行我的代码时似乎已经过早地调用了函数。

我在函数中添加了一个断点，在我循环访问代码3次后，我能够看到tableviewcontroller。

我还添加了两个打印命令。一个位于viewDidLoad，一个位于titleForHeaderInSection。猜猜是什么，首先打印titleForHeaderInSection打印件。

在viewDidLoad之后不应该调用此函数吗？我的问题怎么解决？

这就是代码的样子：

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＆＃39; a＆＃39;并且其他3个的标题没有指定名称＆＃39;

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

试试这个......

override func viewWillAppear(animated: Bool) {
    super. viewWillAppear (animated);

    double delayInSeconds = 5.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW,delayInSeconds * NSEC_PER_SEC);
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
          //code to be executed on the main queue after delay
          self.tableView.reloadData()
     });
}

Answer 2

在UITableView's方法中尝试设置dataSource delegate和viewDidLoad而不是xib。它可能有用，只是猜测。

Answer 3

显然重新启动Xcode（它意外崩溃）解决了我的问题。现在，在执行titleForHeaderInSection之前，数组已正确加载。

override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
    var kopTekst = ""
    for index in tasks.indices{
        if section == index{
        kopTekst = tasks[index]
        }
    }
    return kopTekst
}

我也改变了一些代码，但意图应该是一样的。

似乎在iOS中的viewDidLoad之前调用了`titleForHeaderInSection`

3 个答案: