问题描述
我正在尝试编写一个可以显示图像的简单小部件。此图像位于应用程序的资产中。到目前为止,这是我的代码。大部分是从标准模板复制过来的:
import WidgetKit
import SwiftUI
struct Provider: TimelineProvider {
func placeholder(in context: Context) -> SimpleEntry {
SimpleEntry(date: Date())
}
func getSnapshot(in context: Context,completion: @escaping (SimpleEntry) -> ()) {
let entry = SimpleEntry(date: Date())
completion(entry)
}
func getTimeline(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)!
let entry = SimpleEntry(date: entryDate)
entries.append(entry)
}
let timeline = Timeline(entries: entries,policy: .atEnd)
completion(timeline)
}
}
struct SimpleEntry: TimelineEntry {
let date: Date
}
struct contactCodeEntryView : View {
var entry: Provider.Entry
var body: some View {
vstack {
Image("picture")
.resizable()
.scaledToFit()
}
}
}
@main
struct contactCode: Widget {
let kind: String = "contactCode"
var body: some WidgetConfiguration {
StaticConfiguration(kind: kind,provider: Provider()) { entry in
contactCodeEntryView(entry: entry)
}
.configurationdisplayName("My Widget")
.description("This is an example widget.")
}
}
struct contactCode_Previews: PreviewProvider {
static var previews: some View {
contactCodeEntryView(entry: SimpleEntry(date: Date()))
.previewContext(WidgetPreviewContext(family: .systemSmall))
}
}
我知道小部件可以与 SwiftUI 一起使用,但是当我尝试预览/运行此代码时,我只得到一个空白小部件。当我尝试在其他 SwiftUI 项目中运行来自 contactCodeEntryView
(略有修改)的代码时,它可以工作。为什么?有人可以帮我吗?
解决方法
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