我正在尝试将数据(标题、成分、步骤、图像)从选定的表格单元格传递到新的 View Controller 。但我不知道该怎么做。我有很多错误，所以现在我重新开始。谁能帮我？我是编码新手。谢谢:-) 我的代码:
VIEWCONTROLLER.SWIFT
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
var recipes = [Recipe]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
}
override func viewDidAppear(animated: Bool) {
fetchAndSetResults()
tableView.reloadData()
}
func fetchAndSetResults(){
let app = UIApplication.sharedApplication().delegate as! AppDelegate
let context = app.managedObjectContext
let fetchRequest = NSFetchRequest(entityName: "Recipe")
do {
let results = try context.executeFetchRequest(fetchRequest)
self.recipes = results as! [Recipe]
} catch let err as NSError {
print(err.debugDescription)
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
if let cell = tableView.dequeueReusableCellWithIdentifier("RecipeCell") as? RecipeCell {
let recipe = recipes[indexPath.row]
cell.configureCell(recipe)
return cell
} else {
return RecipeCell()
}
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return recipes.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "RecipeDetail") {
//I WANT TO PASS THE DATA FROM THE TABLE CELL TO THE NEW VIEW CONTROLLER (RECIPEDETAILVC)
}
}
func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
let app = UIApplication.sharedApplication().delegate as! AppDelegate
let context = app.managedObjectContext
context.deleteObject(recipes[indexPath.row])
app.saveContext()
recipes.removeAtIndex(indexPath.row)
tableView.reloadData()
}
}
}
创建食谱.SWIFT
class CreateRecipeVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
@IBOutlet weak var recipeTitle: UITextField!
@IBOutlet weak var recipeIngredients: UITextField!
@IBOutlet weak var recipeSteps: UITextField!
@IBOutlet weak var recipeImage: UIImageView!
@IBOutlet weak var addRecipeBtn: UIButton!
var imagePicker: UIImagePickerController!
override func viewDidLoad() {
super.viewDidLoad()
imagePicker = UIImagePickerController()
imagePicker.delegate = self
recipeImage.layer.cornerRadius = 5.0
recipeImage.clipsToBounds = true
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
imagePicker.dismissViewControllerAnimated(true, completion: nil)
recipeImage.image = image
}
@IBAction func addImage(sender: AnyObject!) {
presentViewController(imagePicker, animated: true, completion: nil)
}
@IBAction func createRecipe(sender: AnyObject!) {
if let title = recipeTitle.text where title != "" {
let app = UIApplication.sharedApplication().delegate as! AppDelegate
let context = app.managedObjectContext
let entity = NSEntityDescription.entityForName("Recipe", inManagedObjectContext: context)!
let recipe = Recipe(entity: entity, insertIntoManagedObjectContext: context)
recipe.title = title
recipe.ingredients = recipeIngredients.text
recipe.steps = recipeSteps.text
recipe.setRecipeImage(recipeImage.image!)
context.insertObject(recipe)
do {
try context.save()
} catch {
print("Could not save recipe")
}
self.navigationController?.popViewControllerAnimated(true)
}
}
}
RECIPEDETAILVC.SWIFT
import UIKit
import CoreData
class RecipeDetailVC: UIViewController {
@IBOutlet weak var recipeImage: UIImageView!
@IBOutlet weak var recipeTitle: UILabel!
@IBOutlet weak var recipeIngredients: UILabel!
@IBOutlet weak var recipeSteps: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//I WANT TO DISPLAY THE CORE DATA INFORMATION FROM THE TABLE CELL I SELECTED.
}
}
RECIPECELL.SWIFT
class RecipeCell: UITableViewCell {
@IBOutlet weak var recipeTitle: UILabel!
@IBOutlet weak var recipeImage: UIImageView!
func configureCell(recipe: Recipe) {
recipeTitle.text = recipe.title
recipeImage.image = recipe.getRecipeImage()
}
}
最佳答案
您需要跟踪该人单击了哪个项目。
var mySelection: Int?
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
mySelection = indexPath.row
}
然后，在进行 segue 时使用它。
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "RecipeDetail") {
//I WANT TO PASS THE DATA FROM THE TABLE CELL TO THE NEW VIEW CONTROLLER (RECIPEDETAILVC)
let recipeDetailControler = segue.destinationViewController as! RecipeDetailViewController
if let mySelection = mySelection {
let recipe = recipes[mySelection]
// add this function to your
recipeDetailControler.configureRecipeData(recipe)
}
}
}
将此函数添加到 RecipeDetailViewController:
func configureRecipeData(recipe: Recipe) {
// IMPLEMENT ME
}
关于ios - 将核心数据从选定的表格单元格传递到新的 View Controller ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36116119/