将字符串委托给 UILabel，将图像委托给 UIImageView - Swift

Question

所以，这就是正在发生的事情：我有两个控制器； MainViewController 和 DetailsTableViewController。在 DetailsTableViewController 上，我想为随机食谱写一个名称，然后我从照片库中选择一张图片。之后，我想将这些数据发送到 MainViewController 中的一个单元格。代码如下：

import UIKit
import CoreData

class MainViewController: UIViewController, UITableViewDataSource, UITableViewDelegate, sendDetailsToMVCDelegate {


    @IBOutlet weak var mainImage: UIImageView!
    @IBOutlet weak var tableView: UITableView!
    var namesListArray: [String] = []
    var imagesListArray: [UIImage] = []

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)
    }

    func sendDetailsToMVC (name: String, image: UIImage) {
        namesListArray.append(name)
        imagesListArray.append(image)
    }

    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return namesListArray.count
    }

    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        var row = indexPath.row
        var name: String = namesListArray[row] as String
        var image: UIImage = imagesListArray[row] as UIImage
        var cell = self.tableView.dequeueReusableCellWithIdentifier("customCell") as! CustomCellTableViewCell
        cell.customLabel!.text = (name as String)
        cell.customImage.image = (image as UIImage)
        return cell
     }
}

和

import UIKit
import CoreData

protocol sendDetailsToMVCDelegate {
    func sendDetailsToMVC(name: String, image: UIImage)
}

class DetailsViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UITableViewDataSource, UITableViewDelegate, sendNameToDetailsViewControllerDelegate {


@IBOutlet weak var nameTextField: UITextField!
@IBOutlet weak var recipeImage: UIImageView!
@IBOutlet weak var tableView: UITableView!
var ingredientsList = [""]
var delegateDetails: sendDetailsToMVCDelegate?

override func viewDidLoad() {
    super.viewDidLoad()
    let howToDoButton = UIBarButtonItem(title:"How To Do", style: UIBarButtonItemStyle.Plain, target: self, action: Selector("showHowToDoScreen"))
    navigationItem.rightBarButtonItem = howToDoButton
    let newIngredientButton = UIBarButtonItem(title:"New Ingredient", style: UIBarButtonItemStyle.Plain, target:self, action: Selector("showNewIngredientScreen"))
    navigationItem.leftBarButtonItem = newIngredientButton

    //Picker imagem pelo toque
    let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: "chooseImage:")
    tapGestureRecognizer.numberOfTapsRequired = 1
    recipeImage.addGestureRecognizer(tapGestureRecognizer)
    recipeImage.userInteractionEnabled = true

}

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return ingredientsList.count
}

func addNameToDetailsViewController(nameToDetail: NSString) {
    ingredientsList.append(nameToDetail as String)
    if tableView == nil {
        return
    }
    tableView!.reloadData()
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let row = indexPath.row
    let ingredientName = ingredientsList[row]
    var cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: nil)
    cell.textLabel!.text = ingredientName
    return cell

}

//Picka a imagem pelo toque, acessando a PhotoLibrary
func chooseImage(recognizer: UITapGestureRecognizer) {
    let imagePicker: UIImagePickerController = UIImagePickerController()
    imagePicker.delegate = self
    imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
    self.presentViewController(imagePicker, animated: true, completion: nil)
}

//Ao selecionar a imagem, coloca-a na tela tocada
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject:AnyObject]) {
    let pickedImage: UIImage = (info as NSDictionary).objectForKey(UIImagePickerControllerOriginalImage) as! UIImage
    // small picture
    let smallPicture = scaleImageWith(pickedImage, newSize: CGSizeMake(75,75))
    var sizeOfImageView:CGRect = recipeImage.frame
    sizeOfImageView.size = smallPicture.size
    recipeImage.frame = sizeOfImageView
    recipeImage.image = smallPicture
    picker.dismissViewControllerAnimated(true, completion: nil)
}


func imagePickerControllerDidCancel(picker: UIImagePickerController) {
    picker.dismissViewControllerAnimated(true, completion: nil)
}

func scaleImageWith(image:UIImage, newSize: CGSize) -> UIImage {
    UIGraphicsBeginImageContextWithOptions(newSize, false, 0.0)
    image.drawInRect(CGRectMake(0,0, newSize.width, newSize.height))
    let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return newImage
}

@IBAction func showNewIngredientScreen() {
    let newIngredient = AddIngredientViewController(delegate: self)
        if let navigation = navigationController {
           navigation.pushViewController(newIngredient, animated: true)
        }
    }

@IBAction func showHowToDoScreen() {
    let howToDo = HowToDoViewController(nibName: "HowToDoViewController", bundle: nil)
    if let navigation = navigationController {
        navigation.pushViewController(howToDo, animated: true)
    }
}



@IBAction func addButton(sender: AnyObject) {

    if nameTextField == nil || recipeImage == nil { return }
    if recipeImage == nil { return }

    let nameLabel = nameTextField.text
    let imageView = recipeImage.image

    if delegateDetails == nil { return }
    delegateDetails?.sendDetailsToMVC(nameLabel, image: imageView!)

    println("button pressed, name \(nameLabel) and image \(imageView) added.")

    if let navigation = self.navigationController {
        navigation.popViewControllerAnimated(true)
    }
}

我的问题是：我传递的信息是否正确？存储图像的正确方法是否像我一样创建图像数组？当我按下 addButton 时，没有任何反应，但它没有崩溃。我在这个问题上已经有一段时间了，如果有人指出我出了什么问题，我将非常感激。

顺便说一下，我是 Swift 的新手，所以请原谅我的任何 n00b 错误。

谢谢！

Answer 1

应该与您的中的相同。在 addButton 函数中，如果不是 nil 而不是应该设置委托，则只设置委托。所以从 DetailViewControler - addButton 中删除 if delegateDetails == nil { return } 它应该可以工作。

将字符串委托给 UILabel，将图像委托给 UIImageView - Swift

Delegating a string to a UILabel and an image to a UIImageView - Swift

iphone

delegates

core-data

uiimageview

swift