[英]Load Date() from FetchedRequest/Core Data into Date Picker SwiftUI
Im loading CoreData into my View like this:我像这样将 CoreData 加载到我的视图中:
@FetchRequest(entity: Rechnungen.entity(), sortDescriptors: []
)var rechnung: FetchedResults<Rechnungen>
Considering im only interested in one certain entity I applied this filter(Only shows a enity which has the right UUID)考虑到我只对某个实体感兴趣,我应用了这个过滤器(只显示一个具有正确 UUID 的实体)
ForEach(self.rechnung.filter{
$0.id == rechnungoffen}) { rechnung in
This works fine since these TextFields show the correct outputs这很好用,因为这些 TextFields 显示正确的输出
Form {
Section(header: Text("Rechnungsdetails")) {
TextField("\(rechnung.verkaeufer)", text:$verkaeufer)
TextField("\(rechnung.beschreibung)", text:$beschreibung)
And now I want to show the Date, and here's where Im stuck because this does not work, and I do not really know why现在我想显示日期,这就是我卡住的地方,因为这不起作用,我真的不知道为什么
DatePicker(selection: $datum, in: ...Date()){
Text("Datum & Uhrzeit")
.onAppear{
self.datum = rechnung.datum
}
Doesn't the variable "datum"(Type Date(), also set as @State) should change to whatever rechnung.datum(Type Date()) is set to?变量 "datum"(Type Date(), 也设置为 @State) 是否应该更改为 rechnung.datum(Type Date()) 设置的任何值? and therefore display the date...因此显示日期...
SwiftUI sadly still is documented poorly but maybe Im missing something essential here遗憾的是,SwiftUI 的记录仍然很差,但也许我在这里遗漏了一些重要的东西
Change the picker code to:将选择器代码更改为:
DatePicker(selection: $datum, in: datum...Date()) {
Text("Datum & Uhrzeit")
.onAppear{
self.datum = rechnung.datum
}
}
Source: https://developer.apple.com/documentation/swiftui/datepicker资料来源: https://developer.apple.com/documentation/swiftui/datepicker
Okay I solved the problem by myself, I changed the Picker code to:好的,我自己解决了问题,我将 Picker 代码更改为:
DatePicker("Datum & Uhrzeit", selection: $datum, in: datum...Date())
.onAppear{
datum = rechnung.datum
}
which now works, god knows why!现在有效,天知道为什么!
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