在编程方面，我还很新。我正在用Swift写作。我有一个UIcollectionView。collectionView如您在我的代码中所见，我已经在中创建了一个单元格。问题是我想创建一个供稿，如Instagram。所以当我按下按钮时，我想在中添加一个单元格UIcollectonView。可以这样做，如果可以，怎么办？
附言 我没有使用情节提要
import UIKit
import Firebase
import MapKit
class HomeController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
let cellId = "cellId"
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Share", style: .Plain, target: self, action: #selector(handleLogout))
navigationItem.leftBarButtonItem = UIBarButtonItem(title: "Logout", style: .Plain, target: self, action: #selector(handleLogout))
navigationItem.title = "Home"
collectionView?.alwaysBounceVertical = true
collectionView?.backgroundColor = UIColor(white: 0.95, alpha: 1)
collectionView?.registerClass(FeedCell.self, forCellWithReuseIdentifier: cellId)
}
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 1
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
return collectionView.dequeueReusableCellWithReuseIdentifier(cellId, forIndexPath: indexPath)
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSizeMake(view.frame.width, 450)
}
func handleLogout() {
do {
try FIRAuth.auth()?.signOut()
} catch let logoutError {
print(logoutError)
}
let loginContoller = LoginController()
presentViewController(loginContoller, animated: true, completion: nil)
}
func addFeedCell() {
}
}
class FeedCell: UICollectionViewCell, UICollectionViewDelegateFlowLayout {
var wiindow: UIWindow?
var mapView: MKMapView?
override init(frame: CGRect) {
super.init(frame: frame)
setupViews()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
let nameLabel: UILabel = {
let label = UILabel()
label.text = "User Name"
label.font = UIFont.boldSystemFontOfSize(14)
label.translatesAutoresizingMaskIntoConstraints = false
return label
}()
let profileImageView: UIImageView = {
let imageView = UIImageView()
imageView.contentMode = .ScaleAspectFit
imageView.backgroundColor = UIColor.blueColor()
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.layer.cornerRadius = 22
imageView.layer.masksToBounds = true
return imageView
}()
let separatorView: UIView = {
let view = UIView()
view.backgroundColor = UIColor(red: 192/255, green: 192/255, blue: 192/255, alpha: 1)
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
func setupViews() {
addSubview(profileImageView)
addSubview(nameLabel)
addSubview(separatorView)
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-10-[v0(44)]-10-[v1]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": profileImageView, "v1": nameLabel]))
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-10-[v0(44)]", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": profileImageView]))
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-10-[v0]-245-|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": nameLabel]))
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": separatorView]))
addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:[v0(1)]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": separatorView]))
self.wiindow = UIWindow(frame: UIScreen.mainScreen().bounds)
self.backgroundColor = UIColor(white: 0.95, alpha: 1)
self.mapView = MKMapView(frame: CGRectMake(0, 70, (self.wiindow?.frame.width)!, 355))
self.addSubview(self.mapView!)
self.mapView!.zoomEnabled = false
self.mapView!.scrollEnabled = false
self.mapView!.userInteractionEnabled = false
}
}
您应该将数据源（如Array<>）附加到您的位置UICollectionView，以便插入单元格；这是因为您要在collectionView:numberOfItemsInSection:委托方法中返回固定数量的单元格（1）。
UICollectionView指定插入新单元格的唯一方法是insertItemsAtIndexPaths:首先需要更新后面的数据源。
这是一个非常简单的示例：
var items = ["a", "b", "c"]
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return items.count
}
func didTapButton() {
// "logical" insert
let newChar = "d"
items.append(newChar)
// "graphical" insert
let newIndexPath = NSIndexPath(forItem: items.indexOf(newChar)!, inSection: 0)
collectionView.insertItemsAtIndexPaths([newIndexPath])
}
//other delegate methods of UICollectionView not implemented in this example
另外，看看这个问题和答案：如何以编程方式在UICollectionVIew中插入Cell？。
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