swift - 为什么它说 "Trailing closure passed to parameter of type ' Int' 不接受闭包”？

Question

我在 SwiftUI 项目中为 Onboarding Screen 添加了第二个 TabView，它抛出了类似这样的错误

Trailing closure passed to a parameter of type 'Int' that does notaccept a closure

有什么想法吗？

TabView {
    ForEach(0 ..< onboardingData.count) { index in
        let element = onboardingData[index]
        OnboardingCard(onboardingItem: element)
    }
}

入职卡:

fileprivate struct OnboardingCard: View {
    let onboardingItem: OnboardingItem
    var body: some View {
        VStack {
            Image(onboardingItem.imageName)
                .resizable()
                .frame(height: 320)
                .frame (maxWidth: .infinity)
            Text(onboardingItem.title)
                .font(.title)
                .foregroundColor(.black)
                .bold()
                .padding()
            Text(onboardingItem.description)
                .multilineTextAlignment(.center)
                .font(.body)
                .foregroundColor(.gray)
                .padding (.horizontal, 15)
        }
    }
}
        
struct OnboardingItem {
    let imageName: String
    let title: String
    let description: String
}

Answer 1

我只是运行你的代码。它按预期工作。

---

确认 Identifiable 协议(protocol)。

struct OnboardingItem: Identifiable {
    var id: UUID = UUID()
    let imageName: String
    let title: String
    let description: String
}

这样做可以避免使用和基于索引的循环。而是这样做:

ForEach(onboardingData) { onboardingItem in
     OnboardingCard(onboardingItem: onboardingItem)
}