出现工作表时，EnvironmentObject不起作用

问题描述

我有一个具有managedObjectContext(环境变量)的视图.当在带有NavigationLink的NavigationView中显示时，它可以正常工作.但是，当视图以表格形式显示时，它不起作用.保存某些实体数据时出现错误.

I have a view that has managedObjectContext(Environment Variable). It works fine when presented in NavigationView with NavigationLink. But it does not work when the view is presented as a sheet.It gives me an error when I save some entity data.

操作无法完成.(Foundation._GenericObjCError错误0.)"

"The operation couldn’t be completed. (Foundation._GenericObjCError error 0.)"

使用环境对象时是否缺少任何内容.我的代码

Is there anything I am missing when using the Environment object. My code

let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext

@Environment(\.managedObjectContext) var managedObjectContext

推荐答案

工作表不是 ContentView 的子组件.

因此，您必须将此环境分别传递给工作表:

Thus, you have to pass this Environment separately to the sheet:

.sheet(isPresented: self.$isPresented, content: MySheetView().environment(\.self.moc)

其中 moc 在启动工作表的视图中定义为:

where moc is defined in the View that initiates the sheet as:

@Environment(\.managedObjectContext) var moc

这篇关于出现工作表时，EnvironmentObject不起作用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！