同一Xcode项目中动态本地Swift Package跨包导入失败的解决方法

我有一个包含两个本地动态Package（PackageA和PackageB）的Xcode项目，希望在PackageB的package.swift中配置依赖，使其能够导入PackageA并在PackageB中使用；同时Xcode项目因已导入PackageB，可同时使用这两个包。但当前配置下PackageB无法找到PackageA，附上两个包的package.swift代码如下：

// PackageB的package.swift
let package = Package(
    name: "PackageB",
    products: [
        .library(
            name: "PackageB",
            targets: ["PackageB"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
    ],
    targets: [
        .target(
            name: "PackageB",
            dependencies: ["PackageA"]),
        .testTarget(
            name: "PackageBTests",
            dependencies: ["PackageB"]),
    ]
)

// PackageA的package.swift
let package = Package(
    name: "PackageA",
    products: [
        .library(
            name: "PackageA",
            targets: ["PackageA"]),
    ],
    dependencies: [
        // Dependencies declare other packages that this package depends on.
        // .package(url: /* package url */, from: "1.0.0"),
    ],
    targets: [
        .target(
            name: "PackageA",
            dependencies: []),
        .testTarget(
            name: "PackageATests",
            dependencies: ["PackageA"]),
    ]
)

• 声明本地依赖路径
  在PackageB的package.swift的dependencies数组中，添加对PackageA的本地路径引用。根据两个包的实际相对目录调整路径，比如如果两者在同一级目录下，修改如下：

  dependencies: [
      .package(path: "../PackageA")
  ],
  

• 明确Target依赖的Product
  PackageB的target不能直接写["PackageA"]，需要明确指定依赖的是PackageA导出的product，修改target部分：

  .target(
      name: "PackageB",
      dependencies: [.product(name: "PackageA", package: "PackageA")]),
  

• 刷新Xcode依赖
  修改完成后，在Xcode中执行File > Packages > Update to Latest Package Versions，或者重启Xcode，让IDE重新加载依赖配置。

• 额外验证项

  • 确认PackageA的package.swift中products里的name确实是PackageA，和PackageB中引用的名称一致
  • 检查相对路径是否正确，避免因路径错误导致无法找到PackageA

内容的提问来源于stack exchange，提问作者bogen