I'm trying to pass data (title, ingredients, steps, image) from the selected table cell to a new view controller. But I don't know how to do that. I got lots of errors, so now I'm starting again. Can anyone help me? I'm new to coding. Thanks:-) My code:
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视图控制器。但我不知道该怎么做。我有很多错误,所以现在我又开始了。谁能帮我?我是编码的新手。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()
}
}
}
CREATERECIPE.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()
}
}
1 个解决方案
#1
1
You need to track which item the person clicked.
您需要跟踪该用户点击的项目。
var mySelection: Int?
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
mySelection = indexPath.row
}
Then, use that when doing the segue.
然后,在做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)
}
}
}
Add this function to RecipeDetailViewController:
将此函数添加到RecipeDetailViewController:
func configureRecipeData(recipe: Recipe) {
// IMPLEMENT ME
}
#1
1
You need to track which item the person clicked.
您需要跟踪该用户点击的项目。
var mySelection: Int?
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
mySelection = indexPath.row
}
Then, use that when doing the segue.
然后,在做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)
}
}
}
Add this function to RecipeDetailViewController:
将此函数添加到RecipeDetailViewController:
func configureRecipeData(recipe: Recipe) {
// IMPLEMENT ME
}