Ändern UICollectionView DataSource

Question

Ich möchte ändern CollectionView DataSource, wenn Benutzer auf die control tippen, aber habe keine Ahnung, wie dies zu implementieren. Hier ist ein Teil des Codes:

View-Controller-Cell:

class ProjectsCollectionViewCell: UICollectionViewCell { 

//MARK: - Public API 
var project : Projects! { 
    didSet { 
     updateUI() 
    } 
} 

private func updateUI() { 
    titleLabel?.text! = project.title 
    subTitleLabel?.text! = project.title 
    featuredImageView?.image! = project.featuredImage 

} 

//MARK: - Private 
@IBOutlet weak var featuredImageView: UIImageView! 
@IBOutlet weak var titleLabel: UILabel! 
@IBOutlet weak var subTitleLabel: UILabel! 

override func layoutSubviews() { 
    super.layoutSubviews() 

    self.layer.cornerRadius = 10.0 
    self.clipsToBounds = true 
} 

} 

-View-Controller-Daten struct:

class Projects { 

//MARK: - Public API 

var title = "" 
var subTitle = "" 
var featuredImage: UIImage! 

init(title: String, subTitle: String, featuredImage: UIImage!) { 

    self.title = title 
    self.subTitle = subTitle 
    self.featuredImage = featuredImage 
} 

//MARK: - Private 

static func showProjectInfo() -> [Projects] { 
    return [ 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "1")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "2")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "3")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "4")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "5")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "6")!) 
    ] 
} 

static func showWebInfo() -> [Projects] { 
    return [ 
     Projects(title: "DA", subTitle: "SPASIBO", featuredImage: UIImage(named: "1")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "2")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "3")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "4")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "5")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "6")!) 
    ] 
} 

static func showDeymInfo() -> [Projects] { 
    return [ 
     Projects(title: "DA", subTitle: "PODJALUISTA", featuredImage: UIImage(named: "1")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "2")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "3")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "4")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "5")!), 
     Projects(title: "DA", subTitle: "PRIVET", featuredImage: UIImage(named: "6")!) 
    ] 
} 

} 

-View-Controller:

class ProjectsVC: UIViewController { 

@IBOutlet weak var headerAlpha: UIImageView! 

@IBOutlet weak var backgroundImage: UIImageView! 
@IBOutlet weak var collectionView: UICollectionView! 

//MARK: - UICollectionView DataSourse 
private var projects = Projects.showProjectInfo() 
private var web = Projects.showWebInfo() 
private var deym = Projects.showDeymInfo() 


override func viewDidLoad() { 
    super.viewDidLoad() 
    self.headerAlpha.backgroundColor = UIColor(red: 21/255, green: 55/255, blue: 80/255, alpha: 0.95) 
} 

//MARK: - CollectionView Data Sourse 

private struct Storyboard { 
    static let Cellidentifier = "Project Cell" 
} 

@IBAction func showComponent(sender: UISegmentedControl) { 


} 

override func viewWillAppear(animated: Bool) { 
    super.viewWillAppear(animated) 
    self.navigationController!.navigationBar.topItem!.title = ""; 

} 
} 

UICollectionView Datenquelle, Delegierter:

extension ProjectsVC: UICollectionViewDataSource { 

func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int { 
    return 1 
} 

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

    return projects.count 
} 

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

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(Storyboard.Cellidentifier, forIndexPath: indexPath) as! ProjectsCollectionViewCell 

    cell.project = self.projects[indexPath.item] 
    return cell 

} 
} 

Answer 1

ist eine Antwort

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

    var returnValue = 0 

    switch (mySegmentControl.selectedSegmentIndex) { 
    case 0: 
     returnValue = projects.count 
    case 1: 
     returnValue = web.count 
    case 2: 
     returnValue = deym.count 
    default: 
     break 
    } 

    return returnValue 
} 

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

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier(Storyboard.Cellidentifier, forIndexPath: indexPath) as! ProjectsCollectionViewCell 

    switch (mySegmentControl.selectedSegmentIndex) { 
    case 0: 
     cell.project = self.projects[indexPath.item] 
    case 1: 
     cell.project = self.web[indexPath.item] 
    case 2: 
     cell.project = self.deym[indexPath.item] 
    default: 
     break 
    } 

    return cell 

} 

}

Answer 2

UICollectionView Objekt hat Eigenschaft datasource, so dass Sie leicht ändern können. Denken Sie daran, dass die DatenquelleUICollectionViewDataSourceProtokoll annehmen muss.

Answer 3

Mit dem Schalter können Sie den ausgewählten Segmentindex erkennen und dort können Sie Ihre Datenquelle gemäß Ihren Anforderungen zuweisen.

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

    //use switch here and call one of your methods (showWebInfo(),showProjectInfo() etc) like projects = showProjectInfo() 

    return projects.count 
} 

Gleiche, was Sie in tun müssen:

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

     let cell = collectionView.dequeueReusableCellWithReuseIdentifier(Storyboard.Cellidentifier, forIndexPath: indexPath) as! ProjectsCollectionViewCell 

    //use switch here and call one of your methods (showWebInfo(),showProjectInfo() etc) like projects = showProjectInfo() 

     cell.project = self.projects[indexPath.item] 
     return cell 

    } 

Answer 4

Sie nur knapp sein Ziel Anruf reload Collection Daten aus der Datenquelle zu laden. Hier

override func viewWillAppear(animated: Bool) { 
    super.viewWillAppear(animated) 
    self.navigationController!.navigationBar.topItem!.title = ""; 
    collectionView.reloadData() 
}