ios - 当我水平滚动 Collection View 时，整个 View 会重新加载并再次开始动画

Question

当我在屏幕上移动 Collection View 时，整个 View Controller 会再次重新加载。这意味着之前发生的所有动画都必须再次发生。有没有办法在 Collection View 加载时停止 View Controller 重新加载？

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {


    let cell2 = CollectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath) as! BookingDateCollectionCellClass

    let later = getDate(indexPath.row + 5).day
    print(later)


    let date: String = String(later)
    print(date)
    cell2.dateLabel.text = date

    let day = getDateData(indexPath.row + 5).dayOfWeek()
    print(day)
    cell2.dayLabel.text = dayShortFromNumber(day!)


    return cell2

}

import UIKit

class BookingDateVC: UIViewController, UITableViewDelegate, UICollectionViewDelegate, UICollectionViewDataSource {

// Outlets

@IBOutlet weak var tableViewDates: UITableView!

@IBOutlet weak var CollectionView: UICollectionView!

@IBOutlet weak var bigMonthView: UIView!

@IBOutlet weak var selectDateLabel: UILabel!

@IBOutlet weak var todayDateView: UIView!

@IBOutlet weak var todayButton: UIButton!

@IBOutlet weak var tomorrowButton: UIButton!

@IBOutlet weak var laterButton: UIButton!

@IBOutlet weak var plusButton: UIButton!

@IBOutlet weak var monthView: UIView!

@IBOutlet weak var monthLabel: UILabel!


// Calendar Variables
var month: Int?
var index: NSIndexPath?
var passData: dataReceipt?


override func viewDidLoad() {
    super.viewDidLoad()

    // Table View Customerisation
    tableViewDates.backgroundColor = UIColor(red: 38/255, green: 163/255, blue: 133/255, alpha: 1)
    self.tableViewDates.center.y += self.view.bounds.height

}

override func viewDidAppear(animated: Bool) {

    // Sets up inital dates - Today, Tomorrow, Later
    let today = getDate(0).day
    let tomorrow = getDate(1).day
    let later = getDate(2).day

    todayButton.setTitle(String(today), forState: .Normal)
    tomorrowButton.setTitle(String(tomorrow), forState: .Normal)
    laterButton.setTitle(String(later), forState: .Normal)
    plusButton.setTitle("+", forState: .Normal)


}

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


@IBAction func todayButton(sender: AnyObject) {
    passData?.data = monthFromNumber(getDate(0).month) + " " + todayButton.currentTitle!
}

@IBAction func tomorrowButton(sender: AnyObject) {
    passData?.data = monthFromNumber(getDate(1).month) + " " + tomorrowButton.currentTitle!

}

// Gets date as components - Hour, Day, Month, Year
func getDate(days: Int) -> NSDateComponents{
    let date = getDateData(days)
    let unitFlags: NSCalendarUnit = [.Hour, .Day, .Month, .Year]
    let components = NSCalendar.currentCalendar().components(unitFlags, fromDate: date)
    return components

}

// Gets date + number of days from today
func getDateData(days: Int) -> NSDate{
    let today = NSDate()
    let date = NSCalendar.currentCalendar().dateByAddingUnit(
        .Day,
        value: days,
        toDate: today,
        options: NSCalendarOptions(rawValue: 0))

    return date!
}

// Returns day string in full from day int
func dayFromNumber(day: Int) -> String{
    switch(day){
    case 1:
        return "SUNDAY"
    case 2:
        return "MONDAY"
    case 3:
        return "TUESDAY"
    case 4:
        return "WEDNESDAY"
    case 5:
        return "THURSDAY"
    case 6:
        return "FRIDAY"
    case 7:
        return "SATURDAY"
    default:
        return ""
    }
}

// Returns day string in short from day int
func dayShortFromNumber(day: Int) -> String{
    switch(day){
    case 1:
        return "SUN"
    case 2:
        return "MON"
    case 3:
        return "TUE"
    case 4:
        return "WED"
    case 5:
        return "THU"
    case 6:
        return "FRI"
    case 7:
        return "SAT"
    default:
        return ""
    }
}

// Returns month string in short from month int
func monthFromNumber(month: Int) -> String{
    switch(month){
    case 1:
        return "JAN"
    case 2:
        return "FEB"
    case 3:
        return "MAR"
    case 4:
        return "APR"
    case 5:
        return "MAY"
    case 6:
        return "JUN"
    case 7:
        return "JUL"
    case 8:
        return "AUG"
    case 9:
        return "SEP"
    case 10:
        return "OCT"
    case 11:
        return "NOV"
    case 12:
        return "DEC"
    default:
        return ""
    }
}

func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return 3
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableViewDates.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! BookingDateCellClass
    let later = getDate(2).day
    let date: String = String(indexPath.row + later)
    cell.dateLabel.text = date

    let day = getDateData(indexPath.row + 2).dayOfWeek()
    cell.dayLabel.text = dayFromNumber(day!)

    let bgColorView = UIView()
    bgColorView.backgroundColor = UIColor(red: 253/255, green: 196/255, blue: 0, alpha: 1)
    cell.selectedBackgroundView = bgColorView


    return cell
}


func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let cell = tableView.cellForRowAtIndexPath(indexPath) as! BookingDateCellClass
    passData?.data =  monthFromNumber(getDate(indexPath.row + 2).month) + " " + cell.dateLabel.text!
    performSegueWithIdentifier("timeSegue", sender: self)
}




func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
    // Return false if you do not want the specified item to be editable.
    return false
}



func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
    return 60.0;//Choose your custom row height
}




@IBAction func laterButtonFunc(sender: AnyObject) {

    // Animates to later dates
    UIView.animateWithDuration(0.5, animations: {
        self.tableViewDates.center.y = self.view.frame.height / 2

        self.todayDateView.center.y = self.view.frame.height / 6
        self.monthView.center.y = (self.view.frame.height / 4) * 3.25

    })
}


func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}


func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return 20
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {


    let cell2 = CollectionView.dequeueReusableCellWithReuseIdentifier("CollectionCell", forIndexPath: indexPath) as! BookingDateCollectionCellClass

    let later = getDate(indexPath.row + 5).day
    let date: String = String(later)
    cell2.dateLabel.text = date

    let day = getDateData(indexPath.row + 5).dayOfWeek()
    cell2.dayLabel.text = dayShortFromNumber(day!)
    //self.monthLabel.text = monthFromNumber(getDate(indexPath.row + 5).month)

    return cell2

    }
func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    let cell = collectionView.cellForItemAtIndexPath(indexPath) as! BookingDateCollectionCellClass
    passData?.data =  monthFromNumber(getDate(indexPath.row + 5).month) + " " + cell.dateLabel.text!
    performSegueWithIdentifier("timeSegue", sender: indexPath)
}


override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "timeSegue" {
        if let destination = segue.destinationViewController as? BookingTimeVC {
            print((passData?.data)!)
            destination.passData = passData



        }
    }
}


}

Answer 1

我没有注意到调度没有完全执行。您在线程完成执行之前触摸了按钮。此外，我认为数据的调用不正确。应该单独调用设置数据然后重新加载表。或者，您可以在 Segue 时开始设置表数据，这样当用户到达 VC 时，一切都已准备就绪。不过，我倾向于这是一个调度问题。