131 lines
4.4 KiB
Swift
131 lines
4.4 KiB
Swift
//
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// PreviewExampleView.swift
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// TeachMate
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//
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// Created by Hongli on 2025/3/18.
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//
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import SwiftUI
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import SwiftData
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/// 示例视图，展示如何使用预览数据
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/// 此视图仅用于开发和测试，不会包含在最终应用中
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struct PreviewExampleView: View {
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@Environment(\.modelContext) private var modelContext
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@Query private var semesters: [Semester]
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var body: some View {
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NavigationStack {
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List {
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Section("学期") {
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ForEach(semesters) { semester in
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HStack {
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Text(semester.title)
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.font(.headline)
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Spacer()
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if semester.isCurrent {
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Text("当前")
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.font(.caption)
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.foregroundStyle(.secondary)
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}
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}
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}
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}
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Section("使用预览数据的示例") {
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NavigationLink("标准预览容器") {
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Text("此视图使用 PreviewData.createContainer()")
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.font(.headline)
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}
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NavigationLink("大数据集预览") {
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Text("此视图使用 PreviewData.createLargeDataContainer()")
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.font(.headline)
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}
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NavigationLink("空容器预览") {
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Text("此视图使用 PreviewData.createEmptyContainer()")
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.font(.headline)
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}
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}
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Section("辅助方法示例") {
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HStack {
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Text("随机课程颜色:")
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RoundedRectangle(cornerRadius: 4)
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.fill(ColorFromHex(hex: PreviewData.randomCourseColor()))
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.frame(width: 20, height: 20)
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}
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HStack {
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Text("随机课程名称:")
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Text(PreviewData.randomCourseName())
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.foregroundStyle(.secondary)
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}
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HStack {
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Text("随机教室位置:")
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Text(PreviewData.randomLocation())
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.foregroundStyle(.secondary)
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}
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HStack {
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Text("随机班级:")
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Text(PreviewData.randomClass())
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.foregroundStyle(.secondary)
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}
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}
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}
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.navigationTitle("预览数据示例")
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}
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}
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// 内部函数，用于从十六进制字符串创建颜色
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// 避免与 ColorExtension.swift 中的扩展冲突
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private func ColorFromHex(hex: String) -> Color {
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let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
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var int: UInt64 = 0
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Scanner(string: hex).scanHexInt64(&int)
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let a, r, g, b: UInt64
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switch hex.count {
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case 3: // RGB (12-bit)
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(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
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case 6: // RGB (24-bit)
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(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
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case 8: // ARGB (32-bit)
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(a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
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default:
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(a, r, g, b) = (1, 1, 1, 0)
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}
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return Color(
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.sRGB,
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red: Double(r) / 255,
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green: Double(g) / 255,
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blue: Double(b) / 255,
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opacity: Double(a) / 255
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)
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}
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}
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// 标准预览
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#Preview("标准预览") {
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PreviewExampleView()
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.modelContainer(PreviewData.createContainer())
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}
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// 大数据集预览
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#Preview("大数据集") {
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PreviewExampleView()
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.modelContainer(PreviewData.createLargeDataContainer())
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}
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// 空容器预览
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#Preview("空容器") {
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PreviewExampleView()
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.modelContainer(PreviewData.createEmptyContainer())
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}
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