当数据从一个视图 Controller 传递到另一个视图时，我如何能够传递图像？

Question

How would I be able to show an image from HomeViewController to the CartViewController

I have the code setup in my cells to where the data passes from one VC to another,

Im trying to present the image when the data is passed

How would I be able to show the image when data is passed from the HomeVC to the CartVC after the atcBtn is pressed

all the data in my labels passes fine its just the image data that fails to pass

I have tried a few ways from stack but I still keep getting error codes on presenting the image in the CartVC

class CartViewController: UIViewController {

    var items: Items!
    @IBOutlet weak var cartTableView: UITableView!

     override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        cartTableView.dataSource = self
        cartTableView.delegate = self
    }

}

extension CartViewController: UITableViewDataSource, UITableViewDelegate {

    func numberOfSections(in tableView: UITableView) -> Int {
        return 1
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return Cart.currentCart.cartItems.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "CartCell", for: indexPath) as! CartCell

        let cart = Cart.currentCart.CartItems[indexPath.row]

        cell.store.text = cart.items.store
        cell.lblMealName.text = (cart.items.name)
        cell.lblSubTotal.text = "$\(cart.items.cost)"

        cell.imageUrl.image = cart.imageUrl   // can't figure out how to get this to code to work since it is an Image to String issue

        return cell

---

class CartCell: UITableViewCell {

    @IBOutlet weak var lblMealName: UILabel!
    @IBOutlet weak var imageUrl: UIImageView!
    @IBOutlet weak var lblSubTotal: UILabel!
    @IBOutlet weak var lblWeight: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }
}

Answer 1

The code you posted doesn't quite match up:

In cellForRowAt in CartViewController , for example, you are using CartCell but your code is setting:

cell.store.text = cart.items.store

but there is no store label / property in your posted CartCell .

However, since you are doing very similar things with HomeCell class, just take the same approach for CartCell .

Something along these lines:

class CartCell: UITableViewCell {

    @IBOutlet weak var lblMealName: UILabel!
    @IBOutlet weak var imageUrl: UIImageView!
    @IBOutlet weak var lblSubTotal: UILabel!
    @IBOutlet weak var lblWeight: UILabel!

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    func configure(withItems items: Items) {
        //store.text = cart.items.store
        lblMealName.text = (items.name)
        lblSubTotal.text = "$\(items.cost)"
        imageUrl.sd_setImage(with: URL(string: items.imageUrl))
    }

}

and change `cell

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "CartCell", for: indexPath) as! CartCell

    let cart = Cart.currentCart.CartItems[indexPath.row]

    //cell.store.text = cart.items.store
    //cell.lblMealName.text = (cart.items.name)
    //cell.lblSubTotal.text = "$\(cart.items.cost)"

    //cell.imageUrl.image = cart.imageUrl   // can't figure out how to get this to code to work since it is an Image to String issue

    cell.configure(withItem: cart)

    return cell
}

Answer 2

This appears to be where the problem is

cell.imageUrl.image = cart.imageUrl // can't figure out how to get this to code to work since it is an Image to String issue

and as you noted, that code doesn't really make sense... If you're storing a url (a string) in your cart object, then you can't cast that to an image with cell.imageUrl.image, right?

You would need to assign it to the url

cell.imageUrl = cart.imageUrl

Of course that will just pass the url to the cell. The cell would then need some intelligence to get that associated image from the url.

Some pseudo code for your CartCell class...

cell.store.text = cart.items.store
cell.lblMealName.text = (cart.items.name)
cell.lblSubTotal.text = "$\(cart.items.cost)"

cell.setImageUrlAndDisplayImage( cart.imageUrl )

and then the function in the CartCell class

func setImageUrlAndDisplayImage( imageUrl: URL) {
    self.setImage(with: URL(string: imageUrl))
}

or of course, you could just assign the image directly to the CartCell image property if it has one.

cell.store.text = cart.items.store
cell.lblMealName.text = (cart.items.name)
cell.lblSubTotal.text = "$\(cart.items.cost)"

cell.the_image = UIImage(with: URL(string: cart.imageUrl))

The above is just pseudo code since we don't know what you Cart class or CartCell class looks like.