Swift TipKit complex rule with filter

Question

I'm trying to implement a complex rule to display a Tip from TipKit.

I'm using the official documentation (https://developer.apple.com/documentation/tipkit/tips/event) as example. But the same exact code doesn't compile and gives me the error "The filter function is not supported in this rule." on the line 0ドル.donations.filter { 0ドル.landmarkName != "Wilbere Bowl" }.count > 3

import SwiftUI
import TipKit
struct ContentView: View {
 var tip = InlineTip()
 var body: some View {
 VStack {
 Image(systemName: "globe")
 .imageScale(.large)
 .foregroundStyle(.tint)
 Text("Hello, world!")
 TipView(tip)
 Button("TIP") {
 InlineTip.didViewLandmarkDetail.sendDonation(.init(landmarkID: 0, landmarkName: "TEST"))
 }
 }
 .padding()
 }
}
struct InlineTip: Tip {
 static let didViewLandmarkDetail = Tips.Event<DidViewLandmark>(id: "didViewLandmarkDetail")
 var title: Text {
 Text("Save as a Favorite")
 }
 var message: Text? {
 Text("Your favorite backyards always appear at the top of the list.")
 }
 var image: Image? {
 Image(systemName: "star")
 }
 var rules: [Rule] {
 // Define a rule based on the interaction.
 #Rule(Self.didViewLandmarkDetail) {
 0ドル.donations.filter { 0ドル.landmarkName != "Wilbere Bowl" }.count > 3
 }
 }
}
struct DidViewLandmark: Codable, Sendable {
 let landmarkID: Int
 let landmarkName: String
}

Sorry, if it's a duplicate. I couldn't find anything related to this error.

Answer 1

I had the same issue just now.

I figured out, you need to exactly use the syntax provided by the documentation:

[...]
 #Rule(LandmarkDetail.didViewLandmarkDetail) {
 0ドル.donations.filter({ 0ドル.landmarkName != "Wilbere Bowl" }).count > 3
 }
[...]

Note the round brackets in the filter function.

• lyzkov: That's ridiculous. They restrict correct syntax due to underdeveloped macros... and that's undocumented, yet advertised as a feature ready to use in the public release of iOS. YEAH