swift - UICollectionView 和取消选择单元格不起作用。一旦被选择。这里有什么错误？

Question

嘿，我有一些代码可以正常执行，但我无法从 UICollectionView 中取消选择单元格。一旦被选择，它就会保持选中状态。尝试了其他帖子中的大部分方法，但无法解决。请看一下并告诉我

我的 VIEWCONTROLLER.SWIFT 部分

 @IBOutlet weak var collectionView: UICollectionView!
@IBOutlet weak var selectedImg: UIImageView!
@IBOutlet weak var textLabela: UILabel!

var selectedPerson: Person?
var hasSelectedImage: Bool = false
let imagePicker = UIImagePickerController()



let missingPeople = [
    Person(personImageUrl: "person1.jpg"),
    Person(personImageUrl: "person2.jpg"),
    Person(personImageUrl: "person3.jpg"),
    Person(personImageUrl: "person4.jpg"),
    Person(personImageUrl: "person5.jpg"),
    Person(personImageUrl: "person6.png")
]

override func viewDidLoad() {
    super.viewDidLoad()
   collectionView.delegate = self
    collectionView.dataSource = self
    imagePicker.delegate = self

    let tap = UITapGestureRecognizer(target: self, action: Selector("loadPicker:"))
    tap.numberOfTapsRequired = 1
    selectedImg.addGestureRecognizer(tap)
    collectionView.allowsMultipleSelection = true;
}





func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    return missingPeople.count
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
 // so kur da napisam ovde

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("PersonCell", forIndexPath: indexPath) as! PersonCell

    //cell.selected = true
    //collectionView.selectItemAtIndexPath(indexPath, animated: true, scrollPosition: .None)

    let person = missingPeople[indexPath.row]
    cell.configureCell(person)
    return cell
}





func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {

    self.selectedPerson = missingPeople[indexPath.row]
    let cell = collectionView.cellForItemAtIndexPath(indexPath) as! PersonCell
    cell.configureCell(selectedPerson!)
    cell.setSelected()

}


func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
    if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
        selectedImg.image = pickedImage
        hasSelectedImage = true
    }
    dismissViewControllerAnimated(true, completion: nil)
}

func showErrorAlert() {
    let alert = UIAlertController(title: "Select Person & Image", message: "Please select a missing person to check and an image", preferredStyle: UIAlertControllerStyle.Alert)

    let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil)
    alert.addAction(ok)
    self.presentViewController(alert, animated: true, completion: nil)
}

func loadPicker(gesture: UITapGestureRecognizer) {
    imagePicker.allowsEditing = false
    imagePicker.sourceType = .PhotoLibrary // .Camera

    presentViewController(imagePicker, animated: true, completion: nil)
} ..... ..... ...... and so on

PersonCell.swift

import UIKit
class PersonCell: UICollectionViewCell {

@IBOutlet weak var personImage: UIImageView!
var person: Person!



func configureCell(person: Person) {
    self.person = person
    self.addOrRemoveBorder()
    if let url = NSURL(string: "\(baseURL)\(person.personImageUrl!)") {
        downloadImage(url)


    }
}

func downloadImage(url: NSURL) {
    getDataFromUrl(url) { (data, response, error) in
        dispatch_async(dispatch_get_main_queue()) { () -> Void in
            guard let data = data where error == nil else { return }
            self.personImage.image = UIImage(data: data)
            self.person.personImage = self.personImage.image

        }
    }

}

func getDataFromUrl(url: NSURL, completion: ((data: NSData?, response: NSURLResponse?, error:NSError?) ->Void)){

    NSURLSession.sharedSession().dataTaskWithURL(url) { (data, response, error) in
        completion(data: data, response: response, error: error)
    }.resume()

}

func addOrRemoveBorder() {
    if self.person.isSelected == true {
        personImage.clipsToBounds = false
        personImage.layer.borderWidth = 2.0
        personImage.layer.borderColor = UIColor.yellowColor().CGColor

    } else {
        personImage.layer.borderColor = UIColor.whiteColor().CGColor
        personImage.layer.borderWidth = 0.0

    }
}

func setSelected() {
    self.person.isSelected = true
    self.addOrRemoveBorder()
    self.person.downloadFaceId()
   super.selected=true

    }
}

到底是什么错误？我无法取消选择该单元格？因为我在所选内容上设置了不同的颜色....

Answer 1

您可以简单地创建一个函数来取消选择单元格，就像使用 setSelected

func deselectCell() {
    self.person.isSelected = false
    self.addOrRemoveBorder()
    //self.person.downloadFaceId() //remove face id or something here
   super.selected = false
    }
}

选项 2(更加动态)

  func selectedOrDeselectCell(isSelected: Bool) {
    self.person.isSelected = isSelected
    self.addOrRemoveBorder()
    if isSelected{
      self.person.downloadFaceId()
    }else{
      //self.person.downloadFaceId() //remove face id or something here
    }
    super.selected = isSelected
  }