在元组中附加两个字符串数组

Question

我想在append中Sting两个Arrays tuple，但它给了我错误？

这是我的班级：

import UIKit
var tuple : [(String, String)] = []
class ViewController: UIViewController , UICollectionViewDelegate{

    let reuseIdentifier = "cell"

    var url : [String] = []
    var image : [String] = []

    override func viewDidLoad(){

    }


    override func viewWillAppear(animated: Bool) {

        for i in tuple{

            url.append(i.0)
            image.append(i.1)
            print("URL values.............. \(url)")
            print("Image values.............. \(image)")
        }


        NSUserDefaults.standardUserDefaults().setObject(url, forKey: "u")
        NSUserDefaults.standardUserDefaults().setObject(image, forKey: "i")
        NSUserDefaults.standardUserDefaults().synchronize()


        var u = NSUserDefaults.standardUserDefaults().objectForKey("u")
        var i = NSUserDefaults.standardUserDefaults().objectForKey("i")

        tuple.removeAll()
        tuple.append(u,i)

    }

当我将类型更改为：

var u : String = NSUserDefaults.standardUserDefaults().objectForKey("u") as! String
var i : String = NSUserDefaults.standardUserDefaults().objectForKey("i") as! String

现在它给了我这个错误：

如何将元组附加到数组？

Answer 1

[删除了代码]

此外，正如用户在评论中告诉您的那样，命名数组tuple是一个坏习惯。名称tuples已经更好了

编辑：正如@ originaluser2所说，你也可以使用tuple.append((u,i))

EDIT2：我认为这绝对是你要找的（我也调整了名字以避免混淆，你也应该这样做）

import UIKit

class ViewController: UIViewController , UICollectionViewDelegate{

    let reuseIdentifier = "cell"

    var tuples: [(String, String)] = []

    var urls: [String] = []
    var images: [String] = []

    override func viewDidLoad(){

    }


    override func viewWillAppear(animated: Bool) {

        for i in tuples {

            urls.append(i.0)
            images.append(i.1)
            print("URL values.............. \(urls)")
            print("Image values.............. \(images)")
        }


        NSUserDefaults.standardUserDefaults().setObject(urls, forKey: "u")
        NSUserDefaults.standardUserDefaults().setObject(images, forKey: "i")
        NSUserDefaults.standardUserDefaults().synchronize()

        // Cast objects as NSArray, since it's a subclass of NSObject
        // Only NSObject derivate classes can be used for these purposes
        let u = NSUserDefaults.standardUserDefaults().objectForKey("u") as! NSArray
        let i = NSUserDefaults.standardUserDefaults().objectForKey("i") as! NSArray

        tuples.removeAll()

        // For every element of the first NSArray
        for index in 0 ..< u.count {
            // Append in the tuples array the strings at position index
            // of both array
            // NSString and String class are bridged, so you can use them both
            // in order to accomplish your needs. An NSArray btw can store NSString, but not String objects
            tuples.append((u.objectAtIndex(index) as! String,i.objectAtIndex(index) as! String))
        }
    }
}