iOS 在 didSelectItemAtIndexPath 处展开 CollectionView [英] iOS unwind CollectionView at didSelectItemAtIndexPath
问题描述
所以我创建了一个应用程序，用户可以在其中创建自定义锻炼.您进入第一个视图添加 x 轮数，然后单击 tableview 中添加轮次的按钮.单击打开另一个带有 collectionview 的活动.
So i have created an app where users create custom workouts. You enter the first view add a x number of rounds,than you click on a button in the tableview where you add rounds.That click opens another activity with a collectionview.
所以问题就在这里，当我点击一个代表需要在回合中进行的练习的元素时，它会向我发送一个空结果.默认情况下，如果我向该字符串添加一个值，它会起作用.
So the problem is here when i click on an element witch represents the exercise that needs to be in the round it sends me an empty result.By default if i add a value to that string it works.
我注意到放松发生在我的 didSelectItemAtIndexPath 之前
I have noticed that the unwind happens before my didSelectItemAtIndexPath
import UIKit
class InsertWorkout: UIViewController{
@IBOutlet var InsertRoundTable: UITableView!
@IBOutlet weak var txtName: UITextField!
var RoundNumber : NSMutableArray = ["Round 1"]
var RoundLabel : NSMutableArray = [""]
var RoundExercise : NSMutableArray = ["add-1"]
var RoundExerciseImages : NSMutableArray = ["providno"]
var RoundNumber_Count=1
var RoundNumber_Add_Counter=1
var studentData : StudentInfo!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
//MARK: UIButton Action methods
@IBAction func btnBackClicked(sender: AnyObject)
{
self.navigationController?.popViewControllerAnimated(true)
}
@IBAction func btnSaveClicked(sender: AnyObject)
{
if(txtName.text == "")
{
Util.invokeAlertMethod("", strBody: "Please enter workout name.", delegate: nil)
}
else
{
let studentInfo: StudentInfo = StudentInfo()
studentInfo.workout_name = txtName.text!
studentInfo.workout_benefit_1=" CUSTOM "
studentInfo.workout_benefit_2=" WORKOUT "
studentInfo.workout_benefit_3=""
studentInfo.workout_requiremnets="arsutech.com"
studentInfo.workout_time="4min"
let isInserted = ModelManager.getInstance().addWorkoutData(studentInfo)
if isInserted {
Util.invokeAlertMethod("", strBody: "Workout added", delegate: nil)
} else {
Util.invokeAlertMethod("", strBody: "Error while adding workout.", delegate: nil)
}
self.navigationController?.popViewControllerAnimated(true)
}
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
self.view.endEditing(true)
InsertRoundTable.endEditing(true)
}
//UITableView
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return RoundNumber.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
var cell : InsertRoundCell! = tableView.dequeueReusableCellWithIdentifier("InsertRoundCell") as! InsertRoundCell
if(cell == nil)
{
cell = NSBundle.mainBundle().loadNibNamed("InsertRoundCell", owner: self, options: nil)[0] as! InsertRoundCell;
}
let exerviseName = RoundNumber[indexPath.row]
let exerciseLabels = RoundLabel[indexPath.row]
let exerciseImage = RoundExercise[indexPath.row]
let exerciseImage_Holder = RoundExerciseImages[indexPath.row]
cell.insert_label_Round.text = exerviseName as? String
cell.addWorkout_Label.text = exerciseLabels as? String
cell.addExercise_Holder?.image = UIImage(named: exerciseImage_Holder as! String) as UIImage?
cell.addWorkoutBut.setBackgroundImage(UIImage(named: exerciseImage as! String) as UIImage?, forState: UIControlState.Normal)
cell.addWorkoutBut.tag = indexPath.row
cell.addWorkoutBut.addTarget(self, action: "logAction:", forControlEvents: .TouchUpInside)
cell.selectionStyle = UITableViewCellSelectionStyle.None
return cell as InsertRoundCell
}
@IBAction func logAction(sender: UIButton){
//self.RoundNumber.replaceObjectAtIndex(sender.tag, withObject: "Ezel")
//let titleString = self.RoundNumber[sender.tag] as? String
//Util.invokeAlertMethod("", strBody: titleString!, delegate: nil)
self.InsertRoundTable.reloadData()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
let destinationVC = segue.destinationViewController as! ChoseExercise
destinationVC.id=sender.tag
RoundNumber_Count=sender.tag
}
@IBAction func unwinndChoseExercise(segue:UIStoryboardSegue){
if let svc = segue.sourceViewController as? ChoseExercise{
self.RoundLabel.replaceObjectAtIndex(RoundNumber_Count, withObject: "\(svc.exercise_label)")
self.RoundExercise.replaceObjectAtIndex(RoundNumber_Count, withObject: "providno")
self.RoundExerciseImages.replaceObjectAtIndex(RoundNumber_Count, withObject: "\(svc.exercise_image)")
self.InsertRoundTable.reloadData()
}
}
//Add Round
@IBAction func addRound(sender: AnyObject) {
if(RoundNumber_Add_Counter<12){
RoundNumber_Add_Counter++
self.RoundNumber.addObject("Round \(RoundNumber_Add_Counter)")
self.RoundLabel.addObject("")
self.RoundExercise.addObject("add-1")
self.RoundExerciseImages.addObject("providno")
self.InsertRoundTable.reloadData()
}else{
Util.invokeAlertMethod("", strBody: "This is the maximum number of rounds", delegate: nil)
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.exercisesNames.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cellexercises_insert", forIndexPath: indexPath) as! Insert_ExerciseCollectionViewCell
cell.insert_exerciseImage?.image = self.exercisesImages[indexPath.row]
cell.insert_exerciseLabel?.text = self.exercisesNames[indexPath.row]
cell.insert_exercisesHardnessImg?.image = self.exercisesHardnessImg[indexPath.row]
return cell
}
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
exercise_label="\(exercisesNames[indexPath.row])"
exercise_image="\(exercises_Exervise_Row_Names[indexPath.row])"
dismissViewControllerAnimated(true, completion: nil)
}
推荐答案
展开的工作原理如下:
首先，将您的 IBAction unwind(segue:UIStoryboardSegue) 放在您打算返回的 vc 中(在本例中为演示者 vc，InsertWorkout).
First, put your IBAction unwind(segue:UIStoryboardSegue) in the vc where you intend to go back (presenter vc, InsertWorkout in this case).
其次，转到情节提要并选择您将从其中展开的 vc(在本例中为集合视图)，然后按住 ctrl 并从导致展开的按钮/单元格(在您的情况下为集合视图单元格)拖动到退出按钮在同一个 vc 之上，您应该会在Selection Segue"下看到一个带有 IBAction 展开方法名称的弹出窗口.
Second, go to storyboard and choose the vc where you'll unwind from (collection view in this case) and ctrl-drag from the button/cell that causes the unwind (collection view cell in your case) to the exit button on top of that same vc and you should see a pop-up with your IBAction unwind method name under 'Selection Segue'.
第三，在当前vc(本例中为collection vc)中实现prepareforsegue，将你的数据传回来.
Third, implement prepareforsegue in the current vc (collection vc in this case) to pass your data back.
class InsertWorkout
{
IBAction func unwind(segue:UIStoryboardSegue) {
//use the data passed from prepare to update your ui or you can also communicate to the sender using segue.sourceVC
}
}
class CollectionVC
{
override func prepareForSegue(segue: UIStoryboadSegue, sender: AnyObject?){
if segue.identifier == "whatever you put in storyboard for segue id" {
if let inserWorkoutVC = segue.destinationViewController as? InsertWorkout {
//pass the data here but don't attempt to update your destination's view ui!!,
}
}
}
}
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