Can't have conditional in SwiftUI ForEach

Question

I'm learning SwiftUI at the moment. I've been playing around with loading a list from CoreData and making changes on / filtering etc. I've run into the issues below. Essentially as soon as I try to apply any conditionals within the ForEach I I'm presented with that error.

This works if I run iterate through the organisations in List itself rather than a ForEach. This isn't the ideal solution as I loose the inbuilt deletion function.

Am I missing something stupid?

let defaults = UserDefaults.standard

@EnvironmentObject var userData: UserData

@Environment(\.managedObjectContext) var managedObjectContext
@FetchRequest(entity: Organisation.entity(), sortDescriptors: [NSSortDescriptor(keyPath: \Organisation.name, ascending: true)])
var orgs: FetchedResults<Organisation>


var body: some View
{
    NavigationView {
        
        List {
            
            ForEach(orgs, id: \.self) {org in
                
                if !self.userData.showFavsOnly || org.isFavorite {
                    
                    NavigationLink(destination: OrganisationView(org: org, moc: self.managedObjectContext)) {
                        
                        OrganisationRow(org: org)
                        
                    }
                    
                }
                
            }
            
        }
        
    }
}

There error code I get is I get is on the for each line and is

Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols

Thanks for your help

pawello2222 · Accepted Answer · 2020-09-04 20:06:15Z

2

Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols

This error means that your ForEach loop expects some View. But you give it an if-statement instead. What if the condition returns false?

The solution may be to wrap the if-statement in some View - it could be a Group, VStack, ZStack...

ForEach(orgs, id: \.self) { org in
    Group {
        if !self.userData.showFavsOnly || org.isFavorite {
            NavigationLink(destination: OrganisationView(org: org, moc: self.managedObjectContext)) {
                OrganisationRow(org: org)
            }
        }
    }
}

answered Sep 4, 2020 at 20:06

pawello2222

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