Vapor 项目未使用 Swift 4 和 Xcode 9 构建/运行

Question

我已经安装了最新版本的 Xcode 9，并且现在已经用 brew 重新安装了几次 vapor，但是每当我尝试构建/运行/更新项目时，我仍然收到以下错误。

这就是我正在使用的东西

1.) Vapor Toolbox: 3.1.2

2.) Apple Swift version 4.0 (swiftlang-900.0.43 clang-900.0.22.8)
    Target: x86_64-apple-macosx10.9

3.) Xcode 9.0
    Build version 9M136h

Error: Could not generate Xcode project: error: manifest parse error(s):
/var/folder/60/n3ldjzgs5vsg06v17_1yy44h0000gn/T/TemporaryFile.VwrbJo.swift:41:5
: error: argument 'targets' must preceed argument 'dependencies'
    targets" [
    ^
error: The product dependency 'Vapor' was not found.
error: The product dependency 'FluentProvider' was not found.
error: The product dependency 'Testing' was not found.

这是我的 Package.swift 文件。查看我最初的错误，我确实尝试切换它们在文件中出现的“目标”和“依赖项”顺序。这没有解决任何问题并产生以下错误消息：error: argument 'dependencies' must precede argument 'targets'

Package.swift

let package = Package(
    name: "test",
    products: [
        .library(name: "App", targets: ["App"]),
        .executable(name: "Run", targets: ["Run"])
    ],
    dependencies: [
        .package(url: "https://github.com/vapor/vapor.git", .upToNextMajor(from: "2.1.0")),
        .package(url: "https://github.com/vapor/fluent-provider.git", .upToNextMajor(from: "1.2.0")),
    ],
    targets: [
        .target(
            name: "App",
            dependencies: ["Vapor", "FluentProvider"],
            exclude: [
                    "Config",
                    "Public",
                    "Resources",
                    ]
        ),
        .target(name: "Run", dependencies: ["App"]),
        .testTarget(name: "AppTests", dependencies: ["App", "Testing"])
    ]
)

Answer 1

Xcode 12 / Swift 5.3 更新

vapor 现在是homebrew/core 的一部分。来源：githubhomebrew-core/Formula/vapor.rb.

##### If applicable, remove the obsolete 'vapor/tap' #####
## List current taps:
brew tap
# homebrew/core
# vapor/tap
## Remove tap:
brew untap vapor/tap

#### Install current version of vapor #####
brew install vapor
brew upgrade vapor

Xcode 9 / Swift 4

1. 双重检查版本：“最新版本”至少是 Xcode 9.1 (9B55) 和 Apple Swift 4.0.2 (swiftlang-900.0.69.1 clang- 900.0.38)

2. 验证Packages.swift 中的第一行是// swift-tools-version:4.0。 如果没有swift-tools-version 行，Packages.swift 可以作为 swift-tools-version 3 处理。这会导致错误。* p>

cd _PROJECT_PATH_
swift package tools-version
# if not 4.0.0, then …
swift package tools-version --set-current

一个例子，Package.swift 如下所示。请参阅Swift Package Manager Manifest API Redesign 和swift-package-manager Usage Documentation 了解更多信息。

// swift-tools-version:4.0
// The swift-tools-version declares the minimum version of Swift
// required to build this package. 
// Syntax: '// swift-tools-version:<specifier>' on the 1st line

import PackageDescription

let package = Package(
    name: "test",
    products: [
        .library(name: "App", targets: ["App"]),
        .executable(name: "Run", targets: ["Run"])
    ],
    dependencies: [
        .package(url: "https://github.com/vapor/vapor.git", .upToNextMajor(from: "2.3.0")),
        .package(url: "https://github.com/vapor/fluent-provider.git", .upToNextMajor(from: "1.3.0")),
    ],
    targets: [
        .target(
            name: "App",
            dependencies: ["Vapor", "FluentProvider"],
            exclude: [
                    "Config",
                    "Public",
                    "Resources",
                    ]
        ),
        .target(name: "Run", dependencies: ["App"]),
        .testTarget(name: "AppTests", dependencies: ["App", "Testing"])
    ]
)

1. 复查

cd _PROJECT_PATH_
swift package tools-version
# should be 4.0.0

vapor clean
vapor update
vapor --version

# Vapor Toolbox: 3.1.2
# Vapor Framework: 2.3.0

4. 尝试重新构建。

---

更多关于使用 Xcode 9 和 Swift 4 与 Vapor 2 的说明已发布在 StackOverflow here。

GitHub 存储库Vapor Examples Lab 有几个示例项目已迁移到 Vapor 2 和 Swift 4。