iOS 14 小组件（3）：WidgetExtension 长按交互以及网络数据处理

1. 基本介绍

Widget Extension 创建看这里 -> iOS 14 小组件（1）：WidgetExtension 创建及报错详解

这一篇介绍一下如何处理长按的弹出框以及网络数据交互更新。

2. 效果展示

Edit Widget Extension.gif

3. 网络数据处理

其实小组件刷新原理很简单，流程就是 Provider -> Entry -> EntryView，这么个逻辑。我们在 Provider 中更新 entry 的属性，然后在 EntryView 中可以拿到这个 entry，于是就可以完成数据的更新展示，当然 entry 的属性参数都是可以自定义的。

这里我就只写一下网络数据的处理，至于 Request 请求，我就不找虚拟接口来处理了。

import WidgetKit
import SwiftUI
import Intents

struct Provider: IntentTimelineProvider {
    
    let response = ResponseObject(test1: "default_test1", test2: "default_test2")
    
    
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), configuration: ConfigurationIntent(), response: response)
    }

    func getSnapshot(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), configuration: configuration, response: response)
        completion(entry)
    }

    func getTimeline(for configuration: ConfigurationIntent, in context: Context, completion: @escaping (Timeline<Entry>) -> ()) {
        var entries: [SimpleEntry] = []

        // Generate a timeline consisting of five entries an hour apart, starting from the current date.
        let currentDate = Date()
        for hourOffset in 0 ..< 5 {
            let entryDate = Calendar.current.date(byAdding: .hour, value: hourOffset, to: currentDate)!
            
            // 在这里做网络请求，拿到请求结果 netResponse 用来更新页面
            let netResponse = ResponseObject(test1: "net_test1", test2: "net_test2")
            let entry = SimpleEntry(date: entryDate, configuration: configuration, response: netResponse)
            entries.append(entry)
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct ResponseObject {
    let test1 : String
    let test2 : String
}


struct SimpleEntry: TimelineEntry {
    let date: Date
    let configuration: ConfigurationIntent
    let response : ResponseObject
    
}

struct WidgetExEntryView : View {
    var entry: Provider.Entry

    var body: some View {
        ZStack(alignment: .leading, content: {
            Image("widgetImage")
                .frame(width: 100, height: 100, alignment: .center)
            
            HStack(alignment: .center, spacing: 15, content: {
                
                Image("xcode")
                
                VStack(alignment: .leading, spacing: 15, content: {
                    
                    Text(entry.response.test1)
                        .foregroundColor(.white)
                    
                    Text(entry.response.test2)
                        .foregroundColor(.white)
                        .lineLimit(2)
                })
                
            })
        }).widgetURL(URL(string: "widget://test/widgetImage"))
    }
}

@main
struct WidgetEx: Widget {
    let kind: String = "WidgetEx"

    var body: some WidgetConfiguration {
        IntentConfiguration(kind: kind, intent: ConfigurationIntent.self, provider: Provider()) { entry in
            WidgetExEntryView(entry: entry)
        }
        .configurationDisplayName("My Widget")
        .description("This is an example widget.")
    }
}

struct WidgetEx_Previews: PreviewProvider {
    
    static var previews: some View {
        let response = ResponseObject(test1: "default_test1", test2: "default_test2")

        WidgetExEntryView(entry: SimpleEntry(date: Date(), configuration: ConfigurationIntent(), response: response))
            .previewContext(WidgetPreviewContext(family: .systemSmall))
    }
}

添加前效果图（注意图中文字变化）