迅速将来自不同类的数组追加到数组 [英] append to array from different class in swift

问题描述

我正在尝试附加到我的数组

  var feedArray：[AnyObject] = [] 
  

来自另一个类。
我有2个类：

  class FeedViewController：UIViewController，UICollectionViewDataSource，
 UICollectionViewDelegate，UIImagePickerControllerDelegate，UINavigationControllerDelegate { 
 
 var feedArray：[AnyObject] = [] 
  

和

  class AddEditViewController：UIViewController，NSFetchedResultsControllerDelegate，
 UIImagePickerControllerDelegate，UINavigationControllerDelegate {
  

我想在我的 AddEditViewController中附加数组 feedArray。
但是我不能。
我尝试过：

  FeedViewController（）。feedArray.append（ TheObjectImTryingToAdd）
  

我什至试图放

  print（FeedViewController（）。feedArray.count）
  

，即使数组有3个对象。

我在做什么错？如果您想查看详细的代码，这是我以前的问题：为什么在我重新搜索时主视图控制器不会更新？

解决方案

经过一番尝试之后，我找到了解决方法

首先，将数组添加到类之外，使其具有全局性，而不是：

  import UIKit 
 import CoreData 
 import MobileCoreServices 
 
 class FeedViewController：UIViewController ，UICollectionViewDataSource，
 UICollectionViewDelegate，UIImagePickerControllerDelegate，
 UINavigationControllerDelegate {
 
 @IBOutlet弱var collectionView：UICollectionView！ 
 var feedArray：[AnyObject] = [] 
  

更改它，以便您拥有：

 导入UIKit 
导入CoreData 
导入MobileCoreServices 
 
 var feedArray：[AnyObject] = [] 
 
类FeedViewController：UIViewController，UICollectionViewDataSource，
 UICollectionViewDelegate，UIImagePickerControllerDelegate，
 UINavigationControllerDelegate {
 
 @IBOutlet弱var collectionView：UICollectionView！ 
  

而不是使用

  FeedViewController（）。feedArray.append（feedItem）
  

现在可以使用：

  feedArray.append（feedItem）
  

问题出在哪里，是我每次使用： FeedViewController（）。fee ...我创建了一个新实例，所以实际上我没有正确地追加数组。 / p>

我希望对您有所帮助。

Im trying to append to my array

var feedArray: [AnyObject] = []

from another class. I have 2 classes:

class FeedViewController: UIViewController, UICollectionViewDataSource,
     UICollectionViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

      var feedArray: [AnyObject] = []

and

class AddEditViewController: UIViewController, NSFetchedResultsControllerDelegate,
      UIImagePickerControllerDelegate, UINavigationControllerDelegate {

I want to in my "AddEditViewController" append the array "feedArray". But I'm not able. I have tried:

FeedViewController().feedArray.append("TheObjectImTryingToAdd")

I even tried to put

print(FeedViewController().feedArray.count)

but the result is always 0 even though the array have 3 objects.

what I'm i doing wrong? if you want to see detailed code, this is my previous question: why won't my main viewcontroller update when i segue back?

解决方案

So, After playing around a little bit and trying to learn, I found the solution

First of all, add the array outside of the class so it is global, so instead of:

import UIKit
import CoreData
import MobileCoreServices

class FeedViewController: UIViewController, UICollectionViewDataSource,
UICollectionViewDelegate, UIImagePickerControllerDelegate,
UINavigationControllerDelegate {

   @IBOutlet weak var collectionView: UICollectionView!
   var feedArray: [AnyObject] = []

change it so you have:

import UIKit
import CoreData
import MobileCoreServices

 var feedArray: [AnyObject] = []

class FeedViewController: UIViewController, UICollectionViewDataSource,
UICollectionViewDelegate, UIImagePickerControllerDelegate,
UINavigationControllerDelegate {

  @IBOutlet weak var collectionView: UICollectionView!

And instead of using

FeedViewController().feedArray.append(feedItem)

Now you can use:

feedArray.append(feedItem)

What the problem was, is that every time i used : "FeedViewController().fee..." I created a new instance, so i actually didn't append the array properly.

I hope it helped.

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