我有一个LazyVGrid
,它显示了从远程API提取的一些数据。
通过按钮隐藏LazyVGrid
时,遇到内存泄漏。仅当内容超出LazyVGrid
内部显示的内容时,这种情况才会发生。
我已经为您准备了一些代码来重现此泄漏。 这段代码是否有些夸张,还是在苹果方面有漏洞?也许有解决方法?
import SwiftUI
import Foundation
import Combine
enum FakeAPI {
static var fakeData: [Result] {
return [
Result(id: 1), Result(id: 2), Result(id: 3), Result(id: 4), Result(id: 5),
Result(id: 6), Result(id: 7), Result(id: 8), Result(id: 9), Result(id: 10),
Result(id: 11), Result(id: 12), Result(id: 13), Result(id: 14), Result(id: 15),
Result(id: 16), Result(id: 17), Result(id: 18), Result(id: 19), Result(id: 20),
Result(id: 21), Result(id: 22), Result(id: 23), Result(id: 24), Result(id: 25),
Result(id: 26), Result(id: 27), Result(id: 28), Result(id: 29), Result(id: 30)
]
}
static func fetchData() -> AnyPublisher<[Result], Error> {
return Just(fakeData)
.mapError({ $0 as Error })
.eraseToAnyPublisher()
}
}
struct Result: Identifiable {
let id: Int
}
struct ContentView: View {
@StateObject private var vm: ViewModel = ViewModel()
let columns = [
GridItem(.adaptive(minimum: 200), alignment: .top),
GridItem(.adaptive(minimum: 200), alignment: .top)
]
var body: some View {
NavigationView {
ScrollView {
Button {
vm.hide = true
} label: {
Text("Hide")
}
if !vm.hide {
LazyVGrid(columns: columns) {
ForEach(vm.results) { result in
Text("\(result.id)")
.frame(width: 120, height: 120)
.background(Color.red)
}
}
}
}
.navigationTitle("Grid Memory Leak")
.onAppear {
vm.load()
}
}
}
}
final class ViewModel: ObservableObject {
@Published private(set) var results: [Result] = []
@Published var hide = false
private var subscriptions = Set<AnyCancellable>()
func load() -> Void {
FakeAPI.fetchData()
.sink(receiveCompletion: { _ in }, receiveValue: { [weak self] results in
self?.results = results
})
.store(in: &subscriptions)
}
}