Swift 4：如何在didSelectItemAt IndexPath中嵌入字典数组并传值至其他VC

Hey there! Let's tackle your two Swift UICollectionView questions one by one, with code examples tailored to your existing setup:

First, define an array property in your view controller to store the dictionaries (this keeps the data persistent across selections). Then, in the didSelectItemAt method, construct a dictionary with relevant data from userDetails and add it to the array.

Here's a concrete example:

// Add this as a property in your view controller
var selectedItemsArray: [[String: Any]] = []

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    // Fetch the specific data for the selected cell from userDetails
    // Adjust this line to match your actual UserDetails structure
    let selectedCellData = userDetails.cellDataArray[indexPath.item]
    
    // Create a dictionary with the data you need to store
    let itemDictionary: [String: Any] = [
        "userId": selectedCellData.id,
        "userName": selectedCellData.name,
        "fullImageUrl": Constant.url.imageBaseUrl + selectedCellData.imagePath
        // Add any other key-value pairs you require
    ]
    
    // Embed the dictionary into your array
    selectedItemsArray.append(itemDictionary)
    
    // Optional: Print to verify the array was updated
    print("Current selected items array: \(selectedItemsArray)")
}

Note: Adjust the selectedCellData line to match how your UserDetails struct/class stores data for each collection view cell.

The most straightforward way to pass data between view controllers is using a property on the target view controller. Here's how to implement it:

Step 1: Add a property to your target view controller #

In the view controller you want to navigate to (e.g., UserDetailViewController), define a property to receive the userDetails data:

class UserDetailViewController: UIViewController {
    // Property to hold the incoming user details
    var incomingUserDetails: UserDetails!
    
    // Rest of your view controller code...
}

Step 2: Pass the data and navigate in didSelectItemAt #

Back in your collection view's view controller, initialize the target VC, assign userDetails to its property, then navigate to it:

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    // Initialize the target view controller (adjust the identifier to match your storyboard)
    guard let detailVC = storyboard?.instantiateViewController(withIdentifier: "UserDetailViewController") as? UserDetailViewController else {
        print("Failed to initialize UserDetailViewController")
        return
    }
    
    // Pass your userDetails data to the target VC
    detailVC.incomingUserDetails = self.userDetails
    
    // Navigate to the target VC (use push if using a navigation controller, or present for modals)
    navigationController?.pushViewController(detailVC, animated: true)
    // OR present modally: present(detailVC, animated: true, completion: nil)
}

Pro tip: Using guard let safely handles cases where the view controller can't be initialized, preventing crashes.

内容的提问来源于stack exchange，提问作者Gorib Developer