Question

以下是我的代码。在对应用程序进行测试后，我意识到didSelectRowAtIndex是在prepareForSegue之后运行的。如何让didSelectRowAtIndex先运行。

如果答案涉及线程，我不知道它是如何工作的，所以请解释一下。感谢信。

 import UIKit

class AvailableShifts: UITableViewController {

    var shiftData: NSMutableArray = NSMutableArray()
    var shiftID: String!

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(true)

//        self.refreshControl = UIRefreshControl()
//        
//        self.refreshControl?.addTarget(self, action: "refreshList", forControlEvents: .ValueChanged)

        loadData()

        // 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()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // MARK: - Table view data source

    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        // #warning Potentially incomplete method implementation.
        // Return the number of sections.
        return 1
    }

    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        // #warning Incomplete method implementation.
        // Return the number of rows in the section.
        return shiftData.count
    }


    override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell {

        let cell:AvailableShiftsCell = tableView!.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath!) as AvailableShiftsCell

        let shift: PFObject = shiftData.objectAtIndex(indexPath!.row) as PFObject

        cell.locationLabel.text = shift.objectForKey("Location") as String?
        cell.shiftLabel.text = shift.objectForKey("Shift") as String?
        cell.dateLabel.text = shift.objectForKey("Date") as String?
        cell.id.text = shift.objectId

        return cell
    }

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

        let shift: PFObject = shiftData.objectAtIndex(indexPath.row) as PFObject
        shiftID = shift.objectId
        println(shiftID)

    }

    func loadData () {


        var getShifts = PFQuery(className: "Shifts")

        getShifts.findObjectsInBackgroundWithBlock {
            (objects:[AnyObject]!, error:NSError!) -> Void in

            if (error == nil) {

                self.shiftData.removeAllObjects()

                for object in objects {

                    self.shiftData.addObject(object)
                }

                let array: NSArray = self.shiftData.reverseObjectEnumerator().allObjects

                self.shiftData = array.mutableCopy() as NSMutableArray

                self.tableView.reloadData()
            }
        }
    }

    @IBAction func refreshButtonPressed(sender: AnyObject) {

        loadData()
    }

//    func refreshList() {
//        
//        loadData()
//        
//        self.refreshControl?.endRefreshing()
//        
//    }

    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
        if (segue.identifier == "details") {
            var svc = segue.destinationViewController as ShiftOverview;

            svc.shiftID = shiftID

            println(shiftID)
        }
    }

}

Answer 1

根本不需要为您的应用程序实现didSelectRowAtIndexPath。如果segue是从单元格构成的，则prepareForSegue:sender:中的sender参数将是单元格。您可以使用表格查看方法indexPathForCell:来获取indexPath，从而获得所需的PFObject。

如何在另一个覆盖方法之前运行UITableView方法？

1 个答案: