问题描述

尝试从服务访问响应数据以显示到 TodayExtension 小部件中

Trying to access response data from service to show into TodayExtenstion Widget

import Foundation

struct MarketIndex:Codable {

    let indicesName: String
    let indicesValue: String
    let dateValue : String
    let indicesChangeValue : String
    let changePercentage : String
    let indexVolume: String?
}

struct MarketIndexCache {
    static let key = "MARKET_INDEX_KEY"
    static func save(_ value: [MarketIndex]!) {
        UserDefaults.standard.set(try? PropertyListEncoder().encode(value), forKey: key)
    }
    static func get() -> [MarketIndex]! {
        var marketIndex: [MarketIndex]!
        if let data = UserDefaults.standard.value(forKey: key) as? Data {
            marketIndex = try? PropertyListDecoder().decode([MarketIndex].self, from: data)
            return marketIndex!
        } else {
            return marketIndex
        }
    }
    static func remove() {
        UserDefaults.standard.removeObject(forKey: key)
    }
}

MarketIndexClient 服务调用类代码片段

MarketIndexClient Service Call class code snippet

marketIndexClient.fetchMarketIndex(symbol: "AAPL,MSFT"){ marketIndex in
    self.stockIndex = marketIndex
    completion()
    MarketIndexCache.save(self.stockIndex)
    self.dispatchGroupCalls.leave()

}

当尝试访问另一个能够获取保存数据的视图控制器时.

When Trying to access another viewcontroller able to get saved data.

override func viewDidLoad() {
    super.viewDidLoad()
    marketIndex = MarketIndexCache.get()
}

当尝试从 TodayWidgetViewController 访问它时，它返回 nil.

When trying to access its from TodayWidgetViewController its returns nil.

import UIKit
import NotificationCenter
class TodayWidgetViewController

    override func viewDidLoad() {
        super.viewDidLoad()

        marketIndex = MarketIndexCache.get()
        print(marketIndex as Any)

    }

两个目标的 UserDefaults 是否不会相互共享数据?

Is UserDefaults for two targets will not share the data with each other?

当我选择目标项目名称时，我是否需要配置 TodayExtenstion，因此当我的项目在设备上运行时，两者都需要相互同步.

When I select target projectName do I need to configure the TodayExtenstion so both need to sync with each other when my project run on device.

在运行应用程序项目时，我无法调试 TodayExtenstionWidget.

I unable to debug TodayExtenstionWidget when running application project.

这是我在使用 TodayExtenstion 时发现的观察结果.

This are my observation found while working with TodayExtenstion.

我无法弄清楚为什么它的回报为零！您的意见将真正指导我实现它.

I am unable to figure it out why its returns nil! Your inputs will really guide me to achieve it.

错误信息:

在展开可选值时意外发现 nil致命错误:在展开可选值时意外发现 nil

推荐答案

嘿，正如@LowKostKustomz 解释的那样，您需要在主应用程序和扩展程序中激活应用程序组.然后在从主应用程序和扩展程序保存时，尝试类似

Hey as @LowKostKustomz explained, you need to activate app groups in both main app and extension. Then while saving from main app as well as extension, try something like

struct MarketIndexCache {
    static let key = "MARKET_INDEX_KEY"
    static let groupBundleID = <#you group identifier#>
    static func save(_ value: [MarketIndex]!) {
        let defaults = UserDefaults.init(suiteName: groupBundleID)
        defaults?.set(try? PropertyListEncoder().encode(value), forKey: key)
    }
    static func get() -> [MarketIndex]! {
        var marketIndex: [MarketIndex]!
        if let data = defaults?.value(forKey: key) as? Data {
            let defaults = UserDefaults.init(suiteName: groupBundleID)
            marketIndex = try? PropertyListDecoder().decode([MarketIndex].self, from: data)
            return marketIndex!
        } else {
            return marketIndex
        }
    }
    static func remove() {
        let defaults = UserDefaults.init(suiteName: groupBundleID)
        defaults?.removeObject(forKey: key)
    }
}

这篇关于如何将响应数据设置到 TodayExtension 小部件中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！