问题描述
我正在开发iOS 14 Widget扩展程序。
func getTimeline(in context: Context,completion: @escaping (Timeline<Entry>) -> ()) {
var entries: [ImageEntry] = []
let currentDate = Date()
for i in 1 ..< 4 {
let imageNumber = String(i)
let currentimage = "image_" + imageNumber
let entry = ImageEntry(date: currentDate,image: currentimage)
entries.append(entry)
}
let nextUpdateDate = Calendar.current.date(byAdding: .minute,value: 5,to: currentDate)!
let timeline = Timeline(entries: entries,policy: .after(nextUpdateDate))
completion(timeline)
}
struct WidgetModuleEntryView : View {
var entry: Provider.Entry
var body: some View {
Image(entry.image)
.resizable()
.scaledToFill()
}
}
第一个图像始终呈现,但后续的图像却不呈现。
可能是什么问题?
解决方法
构造时间表,您需要为每个条目指定明确的条目日期。该策略参数用于重新创建下一个时间轴。
所以您的getTimeline
应该像
func getTimeline(in context: Context,completion: @escaping (Timeline<Entry>) -> ()) {
var entries: [ImageEntry] = []
let currentDate = Date()
for i in 1 ..< 4 {
let imageNumber = String(i)
let currentImage = "image_" + imageNumber
let entryDate = Calendar.current.date(byAdding: .minute,value: (i-1)*5,to: currentDate)!
let entry = ImageEntry(date: entryDate,image: currentImage)
entries.append(entry)
}
let timeline = Timeline(entries: entries,policy: .atEnd)
completion(timeline)
}