Question

我正在尝试将图像从我的集合视图（PortfolioView.swift）传递到另一个视图控制器（PortfolioDetail.swift）。我的PortfolioView.swift代码读取：

import UIKit

class Portfolio View: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    var array = [String] = []
    var name : AnyObject? {
        get {
            return NSUserDefaults.standardUserDefaults().objectForKey("name")
    }
        set {
            NSUserDefaults.standardUserDefaults.setObject(newValue!, forKey: "name")
            NSUserDefaults.standardUserDefaults().synchronize()
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        array = ["PortImage1","PortImage2","PortImage3","PortImage4","PortImage5","PortImage6","PortImage7",
    "PortImage1","PortImage2","PortImage3","PortImage4","PortImage5","PortImage6","PortImage7",
    "PortImage1","PortImage2","PortImage3","PortImage4","PortImage5","PortImage6","PortImage7"]
        self.view.backgroundColor = UIColor(patternImage: UIImage(named: "BackgroundImage.png")!)
    }

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

    func collectionView(collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
        return array.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! CollectionViewCell
        cell.ImageView.image = UIImage(named: array[indexPath.row])
        cell.ImageView.layer.cornerRadius = cell.ImageView.frame.size.width / 2
        cell.ImageView.clipsToBounds = true
        cell.ImageView.layer.borderWidth = 2.0
        cell.ImageView.layer.borderColor = UIColor.whiteColor().CGColor
        return cell
    }
    func collectionView(collectionView: UICollectionView, didDeselectItemAtIndexPath indexPath: NSIndexPath) {
        name = UIImage(named: array[indexPath.row])
    }
}

我的PortfolioDetail.swift代码为：

import UIKit

class PortfolioDetail: UIViewController {
    @IBOutlet var DetailImageView: UIImage!
    @IBOutlet var DetailLabel: UILabel!

    var name: AnyObject? {
        get {
            return NSUserDefaults.standardUserDefaults().objectForKey("name")
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        self.view.backgroundColor = UIColor(patternImage: UIImage(named: "BackgroundImage.png")!)
        DetailImageView.image = UIImage(named: name as! String)
    }

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

当我运行这个应用程序时，我能够显示我的图像数组，但是当我点击其中一个图像时，它不会在我的其他VC中显示图像。我认为我的问题在于以下几行：

DetailImageView.image = UIImage(named: name as! String)

Answer 1

您要在String中保存name = UIImage(named: array[indexPath.row])，然后尝试将其用作name = array[indexPath.row] - 这不起作用，因为这两种类型不兼容。使事情有效的最简单方法是改变 NSUserDefaults
到
name

这样，您就可以在PortfolioDetail中保存图片的名称，并且以后可以根据它加载图片。

现在，正如评论中所说的那样 - 在视图控制器之间传递数据这种方式并不是一个很好的设计选择。最好的方法是直接传递presentViewController - 有两种方法可以做到这一点，具体取决于你如何移动到override func prepareForSegue(_ segue: UIStoryboardSegue, sender sender: AnyObject?) { if (segue.identifier == "YourSegueIdentifier") { let portfolioDetail = segue.destinationViewController as! PortofolioDetail portfolioDetail.name = self.name } }视图控制器 - 通过segue或＆＃34;直接＆＃34; （即在代码中自己实例化并调用let portfolioDetailVC = PortfolioDetail() portoflioDetailVC.name = self.name self.presentViewController(portfolioDetailVC, animated: true, completion: nil)）。

如果您使用segue执行此操作，则应添加（如果您没有）此方法：

get

如果你直接实例化它，它应该是这样的：

set

您还需要删除两个视图控制器中name变量的自定义{{1}}和{{1}}个错误。

如何使用NSUserDefaults将图像从Collection View传递到Xcode中的Detail VC

1 个答案: