xcode 元组类型 '(key: String, value: AnyObject)' 的值没有成员 'subscript'
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Value of tuple type '(key: String, value: AnyObject)' has no member 'subscript'
提问by Belal Elsiesy
I get an error like this : Value of tuple type '(key: String, value: AnyObject)' has no member 'subscript'
我收到这样的错误：元组类型“（键：字符串，值：AnyObject）”的值没有成员“下标”
I tried to search online but I don't understand, it always says something about changing it to an array of dictionaries but when I parse the data as [[String:AnyObject]] it gives me an error.
我试图在线搜索但我不明白，它总是说一些关于将其更改为字典数组的内容，但是当我将数据解析为 [[String:AnyObject]] 时，它给了我一个错误。
Here is my code for context
这是我的上下文代码
`//
// MapViewViewController.swift
// On the Map!
//
// Created by Belal Elsiesy on 11/13/17.
// Copyright ? 2017 Elsiesy Industries. All rights reserved.
//
import UIKit
import MapKit
class MapViewViewController: UIViewController, MKMapViewDelegate {
@IBOutlet weak var MapView: MKMapView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
getLocations()
let appDelegate = UIApplication.shared.delegate as! AppDelegate
let locations = appDelegate.locationData
var annotations = [MKPointAnnotation]()
// When the array is complete, we add the annotations to the map.
for location in locations! {
// Notice that the float values are being used to create CLLocationDegree values.
// This is a version of the Double type.
let lat = CLLocationDegrees(location["latitude"] as! Double)
let long = CLLocationDegrees(location["longitude"] as! Double)
// The lat and long are used to create a CLLocationCoordinates2D instance.
let coordinate = CLLocationCoordinate2D(latitude: lat, longitude: long)
let first = location["firstName"] as! String
let last = location["lastName"] as! String
let mediaURL = location["mediaURL"] as! String
// Here we create the annotation and set its coordiate, title, and subtitle properties
let annotation = MKPointAnnotation()
annotation.coordinate = coordinate
annotation.title = "\(first) \(last)"
annotation.subtitle = mediaURL
// Finally we place the annotation in an array of annotations.
annotations.append(annotation)
}
// When the array is complete, we add the annotations to the map.
self.MapView.addAnnotations(annotations)
}
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
func getLocations() {
var request = URLRequest(url: URL(string: "https://parse.udacity.com/parse/classes/StudentLocation")!)
request.addValue("QrX47CA9cyuGewLdsL7o5Eb8iug6Em8ye0dnAbIr", forHTTPHeaderField: "X-Parse-Application-Id")
request.addValue("QuWThTdiRmTux3YaDseUSEpUKo7aBYM737yKd4gY", forHTTPHeaderField: "X-Parse-REST-API-Key")
let session = URLSession.shared
let task = session.dataTask(with: request) { data, response, error in
if error != nil { // Handle error...
////////////////////////DO THIS LATER
}
print(String(data: data!, encoding: .utf8)!)
let parsedResult: [String:AnyObject]!
do {
parsedResult = try JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! [String : AnyObject]
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.locationData = parsedResult
} catch {
print("Could not parse the data as JSON: '\(data)'")
}
}
task.resume()
}
`
回答by FuzzzzyBoy
From Apple Documentation: You can iterate over the key-value pairs in a dictionary with a for-in loop. Each item in the dictionary is returned as a (key, value) tuple, and you can decompose the tuple's members into temporary constants or variables as part of the iteration:
来自 Apple 文档：您可以使用 for-in 循环迭代字典中的键值对。字典中的每一项都作为 (key, value) 元组返回，作为迭代的一部分，您可以将元组的成员分解为临时常量或变量：
for (key, value) in dictionary {
print(key)
print(value)
}
And pay attention to another issue with your code: 1) There is async code in function getLocation() and when you assign in viewDidLoad()
并注意您的代码的另一个问题：1) 函数 getLocation() 中有异步代码，当您在 viewDidLoad() 中分配时
let locations = appDelegate.locationData
locations equal nil.
位置等于零。
2) Swift 4 have useful features for parse JSON, research this. Now you get dictionary with only one key-value pair with key equal "result"
2) Swift 4 具有解析 JSON 的有用功能，研究一下。现在你得到的字典只有一个键值对，键等于“结果”
回答by ttt
I just ran into this error while trying to sort an array of Tuples. The reason is that Tuple members aren't referenced like Arrays.
我在尝试对元组数组进行排序时遇到了这个错误。原因是元组成员不像数组那样被引用。
For a Tuple you use location.latitude
对于您使用的元组 location.latitude
(For an Array you would use location["latitude"])
（对于您将使用的数组location["latitude"]）
Tuples are declared with regular braces, not the square braces for arrays:
元组用普通大括号声明，而不是数组的方括号：
let location = (latitude: 2.3, longitude: 1.2)
let c = location.latitude // c is now 2.3
I know the question is old, but I hope this helps anyone else searching for has no member 'subscript'
我知道这个问题很老，但我希望这可以帮助其他人搜索没有成员“下标”
