如何使用swift在UICollectionView单元格中加载自定义单元格（xib）

Question

I have created a small sample project using Swift. I have created an "MyCustomView" as xib which contains label, button and imageView as shown in below code:

import UIKit

@IBDesignable class MyCustomView: UIView {

    @IBOutlet weak var lblName: UILabel!
    @IBOutlet weak var btnClick: UIButton!
    @IBOutlet weak var myImageView: UIImageView!

    var view:UIView!

    @IBInspectable
    var mytitleLabelText: String? {
        get {
            return lblName.text
        }
        set(mytitleLabelText) {
            lblName.text = mytitleLabelText
        }
    }

    @IBInspectable
    var myCustomImage:UIImage? {
        get {
            return myImageView.image
        }
        set(myCustomImage) {
            myImageView.image = myCustomImage
        }
    }


    override init(frame : CGRect)
    {
        super.init(frame: frame)
        xibSetup()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        xibSetup()
    }


    func xibSetup()
    {
        view = loadViewFromNib()
        view.frame = self.bounds

        // not sure about this ?
        view.autoresizingMask = [UIViewAutoresizing.FlexibleWidth, UIViewAutoresizing.FlexibleHeight]
        addSubview(view)
    }


    func loadViewFromNib() -> UIView {

        let bundle = NSBundle(forClass: self.dynamicType)
        let nib = UINib(nibName: "MyCustomView", bundle: bundle)
        let view = nib.instantiateWithOwner(self, options: nil)[0] as! UIView

        return view
    }
}

Attached the image of xib for the reference.

In StoryBoard -> ViewController added UIViewCollection which as shown in the below image. In this viewcollection, I need that orange color cell to contain my custom xib to be loaded at runtime.

How do I achieve this?

New Modified code as suggested by Sandeep

// 1 import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var collectionView: UICollectionView!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.collectionView.register(UINib(nibName: "MyCustomView", bundle: nil), forCellWithReuseIdentifier: "myCell")

    }

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

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 7
    }

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

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

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

        cell.lblName.text = "MyNewName"
        return cell
    }
}

// 2 import UIKit

@IBDesignable class MyCustomView: UICollectionViewCell {

    @IBOutlet weak var lblName: UILabel!
    @IBOutlet weak var btnClick: UIButton!
    @IBOutlet weak var myImageView: UIImageView!

    var view:UIView!

    @IBInspectable
    var mytitleLabelText: String? {
        get {
            return lblName.text
        }
        set(mytitleLabelText) {
            lblName.text = mytitleLabelText
        }
    }

    @IBInspectable
    var myCustomImage:UIImage? {
        get {
            return myImageView.image
        }
        set(myCustomImage) {
            myImageView.image = myCustomImage
        }
    }

}

Answer 1

Here is what you can do,

1. Change your MyCustomView class to be a subclass of UICollectionViewCell and not UIView.

2. Remove override init(frame : CGRect) , required init?(coder aDecoder: NSCoder) , func xibSetup() , func loadViewFromNib() -> UIView from MyCustomView

3. I seriously could not understand how are you using your setter and getter for mytitleLabelText and myCustomImage. If its of no use get rid of it as well.

4. Finally you will be left with just IBOutlets in MyCustomView.

5. For better coding practice change the name from MyCustomView to MyCustomCell (optional)

6. Go to your xib, select the xib and set its class as MyCustomView.

7. In the same screen change file owner to yourView controller hosting collectionView

8. In ViewDidLoad of your viewController register your nib.

self.collectionView.registerNib(UINib(nibName: "your_xib_name", bundle: nil), forCellWithReuseIdentifier: "your_reusable_identifier")

9. In cellForItemAtIndexPath,

let cell : MyCustomView = collectionView.dequeueReusableCellWithReuseIdentifier("your_reusable_identifier", forIndexPath: indexPath) as! MyCustomView
cell.lblName.text = "bla bla" //access your Cell's IBOutlets
return cell

10. Finally in order to control the size of cell either override the delegate of collectionView or simply go to your collectionView select the collectionCell in it and drag it to match your dimension :) Thats it :)

Happy coding. Search tutorials for better understanding. I can't explain all delegates as I'll end up writing a blog here.

Happy coding

Answer 2

For Swift 4.0

in viewDidLoad :

//custom collectionViewCell
mainCollectionView.register(UINib(nibName: "your_customcell_name", bundle: nil), forCellWithReuseIdentifier: "your_customcell_identifier")

in cellForItemAt indexPath :

let cell : <your_customcell_name> = mainCollectionView.dequeueReusableCell(withReuseIdentifier: "your_customcell_identifier", for: indexPath) as! <your_customcell_name>

And dont forget to set identifier for your custom cell in xib section.

Answer 3

One line approach if you have to register multiple cells.

extension UICollectionViewCell {

    static func register(for collectionView: UICollectionView)  {
        let cellName = String(describing: self)
        let cellIdentifier = cellName + "Identifier"
        let cellNib = UINib(nibName: String(describing: self), bundle: nil)
        collectionView.register(cellNib, forCellWithReuseIdentifier: cellIdentifier)
    }
}

Steps on how to use

1. Name your Cell identifier as "YourcellName" + "Identifier" eg: CustomCellIdentifier if your cell name is CustomCell.

2. CustomCell.register(for: collectionView)

Answer 4

For Swift 4.2 in viewDidLoad

 self.collectionView.register(UINib(nibName: "your_xib_name", bundle: nil), forCellWithReuseIdentifier: "your_reusable_identifier")

in cellForItemAt indexPath:

let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "your_reusable_identifier", for: indexPath) as! MyCustomView

And of course as @Raj Aryan said: don't forget to set identifier for your custom cell in xib section.