如何在多个数组的索引处保存多个元素？

Posted 2023-02-24

【中文标题】如何在多个数组的索引处保存多个元素？

【英文标题】：How to save multiple elements at index for multiple arrays?

【发布时间】：2015-11-17 21:38:44

【问题描述】：

我正在建立这样的数组......

var vidRankArray = [String]()
var vidIdArray = [String]()
var vidTitleArray = [String]()
var vidDescriptionArray = [String]()
var vidImageArray = [String]()

返回解析信息并插入这样的信息......

override func viewWillAppear(animated: Bool)
    
        let query = PFQuery(className: "UserVideos")
        query.whereKey("userObjectId", equalTo: PFUser.currentUser()!.objectId!)
        query.findObjectsInBackgroundWithBlock  (vid:Array?, error:NSError?) -> Void in
            if vid != nil
            

                for items in vid!
                
                    var i:Int
                    i = 0
                    if items["vid1"] != nil
                    
                        if let myfav1 = items["vid1"] as? NSArray
                        
                            let id = myfav1[0] as! String
                            let rank = myfav1[1] as! String
                            let title = myfav1[2] as! String
                            let description = myfav1[3] as! String
                            let image = myfav1[4] as! String
                            self.vidRankArray.insert(rank, atIndex: i)
                            self.vidIdArray.insert(id, atIndex: i)
                            self.vidTitleArray.insert(title, atIndex: i)
                            self.vidDescriptionArray.insert(description, atIndex: i)
                            self.vidImageArray.insert(image, atIndex: i)
                        
                    
                    if items["vid2"] != nil
                    
                        if let myfav2 = items["vid2"] as? NSArray
                        
                            let id = myfav2[0] as! String
                            let rank = myfav2[1] as! String
                            let title = myfav2[2] as! String
                            let description = myfav2[3] as! String
                            let image = myfav2[4] as! String
                            self.vidRankArray.insert(rank, atIndex: ++i)
                            self.vidIdArray.insert(id, atIndex: ++i)
                            self.vidTitleArray.insert(title, atIndex: ++i)
                            self.vidDescriptionArray.insert(description, atIndex: ++i)
                            self.vidImageArray.insert(image, atIndex: ++i)
                        
                    
                    if items["vid3"] != nil
                    
                        if let myfav3 = items["vid3"] as? NSArray
                        
                            let id = myfav3[0] as! String
                            let rank = myfav3[1] as! String
                            let title = myfav3[2] as! String
                            let description = myfav3[3] as! String
                            let image = myfav3[4] as! String
                            self.vidRankArray.insert(rank, atIndex: ++i)
                            self.vidIdArray.insert(id, atIndex: ++i)
                            self.vidTitleArray.insert(title, atIndex: ++i)
                            self.vidDescriptionArray.insert(description, atIndex: ++i)
                            self.vidImageArray.insert(image, atIndex: ++i)

                        
                    

我正在尝试将每个 vid 中的每个元素按顺序插入各自的数组中。我有 if item != nil 语句，因此如果没有特定项目，则可以跳过它。我很难做到这一点。它要么抛出一个数组超出索引错误或索引超出范围。令人困惑，因为当我的所有物品都附加时它工作得很好。请给我任何想法。

****** 更新 ******* 我添加了这个...

for items in vid!
                
                    for var i=0; i<vid!.count; ++i
                    
                    if items["vid1"] != nil

现在我的控制台打印出这个......

["2", "2", "1", "1"]
["3fy4cqWMhyI", "3fy4cqWMhyI", "TI0DGvqKZTI", "TI0DGvqKZTI"]
["Wonder Girls (원더걸스) - Be My Baby", "Wonder Girls (원더걸스) - Be My Baby", "EXO-K_중독(Overdose)_Music Video", "EXO-K_중독(Overdose)_Music Video"]
["Wonder Girls\' 2nd Album Title Song \"Be My Baby\" Copyrightⓒ 2011. JYP Entertainment. All Rights Reserved ▣ Wonder Girls 2nd Album Site ...", "Wonder Girls\' 2nd Album Title Song \"Be My Baby\" Copyrightⓒ 2011. JYP Entertainment. All Rights Reserved ▣ Wonder Girls 2nd Album Site ...", "The music video of EXO\'s \'Overdose\' is released! EXO is back with a new mini album with a more powerful performance that will make you \'overdose\' on their ...", "The music video of EXO\'s \'Overdose\' is released! EXO is back with a new mini album with a more powerful performance that will make you \'overdose\' on their ..."]
["https://i.ytimg.com/vi/3fy4cqWMhyI/default.jpg", "https://i.ytimg.com/vi/3fy4cqWMhyI/default.jpg", "https://i.ytimg.com/vi/TI0DGvqKZTI/default.jpg", "https://i.ytimg.com/vi/TI0DGvqKZTI/default.jpg"]

感觉就像我很接近。任何想法为什么它给我每个乱序的 2 个？

*********更新********

我让它工作了。我删除了 var i = 0 语句并明确了 insertAtIndex。当我肯定有 vid1 和 vid2 时，它工作得很好。我做了 vid4，但它超出了范围，因为它没有看到 vid3 或索引 2。我怎样才能让它跳过并简单地为保存的那些添加信息，即我试图使用 var i=0;一世

【问题讨论】：

考虑使用struct oder自定义类mit属性rank、id、title、description和image分别保存一项的属性。

请参阅第二次更新。我有点让它工作。如何跳过每个项目并仅添加存在的元素？

【参考方案1】：

只需删除var i，每个insert(variable, atIndex: index) 并将其替换为append(variable)。您的整数代码非常混乱，有时您会增加 i，有时您不会。使用append()，您确定它会将您的项目附加到数组中，因此它将是最后一个并且不会显示范围错误。