如何从 UICollectionView 中的多个部分传递数据

Question

我是 Swift 新手。我正在尝试在详细视图中显示图像，该图像来自UICollectionViewController。我的问题是：

1. 如何通过 segue 将数据发送到详细视图？我无法使用if let indexPath = collectionView.indexPathForSelectedRow... 那么正确的方法是什么？
2. 如何判断用户何时点击来自UICollectionViewController 不同部分的图像，然后将此信息传递给DetailView？

AudiUICollectionViewController.swift：

import UIKit

class AudiUICollectionViewController: UICollectionViewController {

var audiPictures01:[carData] = [
                              carData(name:"01", picture:"1"),
                              carData(name:"02", picture:"2"),
                              carData(name:"03", picture:"3"),
                              carData(name:"04", picture:"4"),
                              carData(name:"05", picture:"5"),
                              carData(name:"06", picture:"6")]

var audiPictures02:[carData] = [
                              carData(name:"07", picture:"7"),
                              carData(name:"08", picture:"8"),
                              carData(name:"09", picture:"9"),
                              carData(name:"10", picture:"10"),
                              carData(name:"11", picture:"11"),
                              carData(name:"12", picture:"12")
                              ]


override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
    return 2
}

override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
    if section == 0 {
        return audiPictures01.count
    } else {
        return audiPictures02.count
    }

}

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    if indexPath.section == 0 {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! AudiUICollectionViewCell

        cell.collectionPicture.image = UIImage(named: audiPictures01[indexPath.row].picture)
        return cell
    } else {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! AudiUICollectionViewCell

        cell.collectionPicture.image = UIImage(named: audiPictures02[indexPath.row].picture)
        return cell
    }


}

//I don't know how to set the segue to pass the data

}

AudiDetailViewController.swift：

import UIKit

class audiDetailViewController: UIViewController {

@IBOutlet weak var audiDetailImageView: UIImageView!

override func viewDidLoad() {
    super.viewDidLoad()

    }
}

Answer 1

您可以使用 prepareForSegue() 功能来处理您的控制器之间的数据，从父母到它的孩子或您的 detailViewController，我将 prepareForSegue() 添加到您的代码中，它应该看起来像这样

 import UIKit

 class AudiUICollectionViewController: UICollectionViewController {

 var audiPictures01:[carData] = [
                          carData(name:"01", picture:"1"),
                          carData(name:"02", picture:"2"),
                          carData(name:"03", picture:"3"),
                          carData(name:"04", picture:"4"),
                          carData(name:"05", picture:"5"),
                          carData(name:"06", picture:"6")]

 var audiPictures02:[carData] = [
                          carData(name:"07", picture:"7"),
                          carData(name:"08", picture:"8"),
                          carData(name:"09", picture:"9"),
                          carData(name:"10", picture:"10"),
                          carData(name:"11", picture:"11"),
                          carData(name:"12", picture:"12")
                          ]


override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 2
}

override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if section == 0 {
    return audiPictures01.count
} else {
    return audiPictures02.count
}

}

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

if indexPath.section == 0 {
    let cell =          collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! AudiUICollectionViewCell

    cell.collectionPicture.image = UIImage(named: audiPictures01[indexPath.row].picture)
    return cell
} else {
    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! AudiUICollectionViewCell

    cell.collectionPicture.image = UIImage(named:       audiPictures02[indexPath.row].picture)
    return cell
}


}

//I don't know how to set the segue to pass the data
// use this line of code in your view controller

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    if let detailVC = segue.destinationViewController as? audiDetailViewController {
        if segue.identifier == "showDetailViewController" {
            let selectedRow = self.collectionView!.indexPathForCell((sender as! UICollectionViewCell))
            var category: carData?
            if selectedRow!.section == 0 {
                category = audiPictures01[selectedRow!.row]
            } else {
                category = audiPictures02[selectedRow!.row]
            }
            detailVC.name = category.name
            detailVC.picture = category.picture
        }
    }

}

}

在 DetailViewController 中，您应该为名称和图片创建一个 var，或者您可以只创建您自己的对象的一个​​变量来将数据传递给它。 我只是为“名称”创建了 2 个变量，另一个为“图片”创建了 var，而您的 detailController 看起来像这样

import UIKit

class audiDetailViewController: UIViewController {

@IBOutlet weak var audiDetailImageView: UIImageView!
var picture: String?
var name: String?

override func viewDidLoad() {
    super.viewDidLoad()
         print(name, picture)
    }
}

希望这会有所帮助