ios-projects/AIStudyApp/AIStudyApp/ContentView.swift

import SwiftUI

struct ContentView: View {
    @State private var selectedTab = "ai"
    var body: some View {
        ZStack {
            switch selectedTab {
            case "ai": NavigationStack { AIHomeView().background(Color.zxBg0.ignoresSafeArea()) }
            case "library": NavigationStack { LibraryHomeView().background(Color.zxBg0.ignoresSafeArea()) }
            case "study": NavigationStack { StudyHomeView().background(Color.zxBg0.ignoresSafeArea()) }
            case "analysis": NavigationStack { AnalysisHomeView().background(Color.zxBg0.ignoresSafeArea()) }
            case "profile": NavigationStack { ProfileView().background(Color.zxBg0.ignoresSafeArea()) }
            default: NavigationStack { AIHomeView() }
            }
            VStack { Spacer(); ZXTabBar(active: $selectedTab) }.ignoresSafeArea(edges: .bottom)
        }
        .animation(.easeInOut(duration: 0.2), value: selectedTab)
        .ignoresSafeArea(edges: .bottom)
    }
}

struct ZXTabBar: View {
    @Binding var active: String
    private let items = [
        ("ai", "AI", "brain.head.profile"),
        ("library", "知识库", "books.vertical"),
        ("study", "学习", "bolt"),
        ("analysis", "分析", "chart.bar"),
        ("profile", "我的", "person"),
    ]

    var body: some View {
        HStack(spacing: 0) {
            ForEach(items, id: \.0) { item in
                let on = item.0 == active
                Button {
                    active = item.0
                } label: {
                    VStack(spacing: 4) {
                        ZStack(alignment: .top) {
                            if on {
                                Capsule()
                                    .fill(Color.zxPurple)
                                    .frame(width: 20, height: 3)
                                    .offset(y: -4)
                            }
                            Image(systemName: on ? "\(item.2).fill" : item.2)
                                .font(.system(size: 22))
                                .foregroundColor(on ? Color.zxPurple : Color.zxF03)
                        }
                        Text(item.1)
                            .font(.system(size: 10, weight: on ? .semibold : .regular))
                            .foregroundColor(on ? Color.zxPurple : Color.zxF03)
                    }
                    .frame(maxWidth: .infinity)
                }
                .accessibilityLabel("\(item.1)标签")
            }
        }
        .padding(.top, 6)
        .padding(.bottom, 34)
        .frame(height: 83)
        .background(.ultraThinMaterial)
        .background(Color.zxBg0.opacity(0.95))
        .overlay(alignment: .top) {
            Rectangle().fill(Color.zxBorder008).frame(height: 1)
        }
    }
}

struct ZXIconBtn: View {
    let icon: String; let size: CGFloat; var branded = false; let action: () -> Void
    var body: some View {
        Button(action: action) {
            Image(systemName: icon).font(.system(size: size * 0.44)).frame(width: size, height: size)
        }
        .foregroundColor(branded ? .white : Color.zxF05)
        .background(branded ? AnyView(ZXGradient.brand) : AnyView(Color(hex: "#FFFFFF", opacity: 0.05)))
        .clipShape(RoundedRectangle(cornerRadius: 10))
        .overlay {
            if !branded {
                RoundedRectangle(cornerRadius: 10).stroke(Color.zxBorder008, lineWidth: 1)
            }
        }
    }
}

struct ZXScoreBox: View {
    let score: Int; let bg: Color; let fg: Color
    var body: some View {
        Text("\(score)")
            .font(.system(size: 12, weight: .heavy))
            .foregroundColor(fg)
            .frame(width: 36, height: 36)
            .background(bg)
            .clipShape(RoundedRectangle(cornerRadius: 10))
    }
}

struct ZXWeakRow: View {
    let score: Int; let topic: String; let lib: String; let priority: String
    var body: some View {
        HStack(spacing: 12) {
            Text("\(score)").font(.system(size: 13, weight: .heavy)).foregroundColor(Color.zxYellow)
                .frame(width: 40, height: 40).background(Color.zxYellowBG(0.15)).clipShape(RoundedRectangle(cornerRadius: 12))
            VStack(alignment: .leading, spacing: 2) {
                Text(topic).font(.system(size: 13, weight: .semibold)).foregroundColor(Color.zxF0)
                Text(lib).font(.system(size: 11)).foregroundColor(Color.zxF04)
            }.frame(maxWidth: .infinity, alignment: .leading)
            Text("\(priority)优先").font(.system(size: 11, weight: .bold))
                .foregroundColor(priority == "高" ? Color.zxRed : Color.zxYellow)
                .padding(.horizontal, 8).padding(.vertical, 3)
                .background((priority == "高" ? Color.zxRedBG(0.15) : Color.zxYellowBG(0.15))).clipShape(Capsule())
        }
        .padding(.horizontal, 16).padding(.vertical, 12)
        .background(Color.zxYellowBG(0.06))
        .overlay(RoundedRectangle(cornerRadius: 14).stroke(Color(hex: "#F59E0B", opacity: 0.15), lineWidth: 1))
        .clipShape(RoundedRectangle(cornerRadius: 14))
    }
}

struct ZXAIInputBar: View {
    @Binding var text: String; let onSend: () -> Void
    var body: some View {
        HStack(spacing: 10) {
            Image(systemName: "sparkles").font(.system(size: 16)).foregroundColor(Color.zxPurple)
            TextField("问 AI 任何学习问题…", text: $text).font(.system(size: 14)).tint(Color.zxPurple).accessibilityLabel("AI 学习问题输入框")
            Spacer()
            Image(systemName: "mic.fill").font(.system(size: 18)).foregroundColor(Color.zxF03).accessibilityLabel("语音输入")
            Button(action: onSend) {
                Image(systemName: "arrow.up").font(.system(size: 14, weight: .bold)).foregroundColor(.white)
                    .frame(width: 30, height: 30).background(ZXGradient.brand).clipShape(RoundedRectangle(cornerRadius: 9))
            }
            .zxPressable()
            .disabled(text.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
            .accessibilityLabel("发送消息")
        }
        .padding(.horizontal, 14).padding(.vertical, 10)
        .background(.ultraThinMaterial).background(Color.zxFill004)
        .overlay(RoundedRectangle(cornerRadius: 20).stroke(Color.zxBorder008, lineWidth: 1))
        .clipShape(RoundedRectangle(cornerRadius: 20))
    }
}