ios - 运行后 `swift build` dependencies are downloaded by class is not found

Question

我正在尝试使用 Swift Package Manager 创建一个示例，我正在创建一个小型库，将其托管在我的 github 上，然后将此库用作依赖项创建一个可执行 Swift 程序。

这是我的设置:

图书馆

MyXMLHelper.swift

class MyXMLHelper {

  static func enclose(text: String, withXMLTag tag: String) -> String {
    let openingTag = "<\(tag)>"
    let closingTag = "</\(tag)>"
    return openingTag + text + closingTag
  }

}

Package.swift

import PackageDescription

let package = Package(
  name: "XMLHelper"
)

也欢迎您在我的github上查看原始版本.

可执行文件(命令行)

ma​​in.swift

import XMLHelper

print("Please enter a text you would like to enclose: ", terminator: "")
let text = readLine()!

print("Please enter the XML tag: ", terminator: "")
let tag = readLine()!

let result = MyXMLHelper.enclose(text: text, withXMLTag: tag)
print("Result: \(result)")

Package.swift

import PackageDescription

let package = Package(
  name: "XML_application",
  dependencies: [
    .Package(url: "https://github.com/nikolasburk/xml-util",
             majorVersion: 2),
  ]
)

运行 swift build 后，文件夹结构如下所示:

所以，swift build 成功下载了依赖项，但它也给我以下错误:

/Users/nburk/Projects/makeschool/tutorials/swift-package-manager-demo/xml-app/main.swift:9:14: error: use of unresolved identifier 'MyXMLHelper'
let result = MyXMLHelper.enclose(text: text, withXMLTag: tag)
             ^~~~~~~~~~~
<unknown>:0: error: build had 1 command failures
error: exit(1): /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2016-08-24-a.xctoolchain/usr/bin/swift-build-tool -f /Users/nburk/Projects/makeschool/tutorials/swift-package-manager-demo/xml-app/.build/debug.yaml

有人知道这是为什么吗？为什么它找不到类 MyXMLHelper，它不应该在这里可见吗？

Answer 1

这可能是因为您的类(class)不是公开的。

在 MyXMLHelper.swift 中，应该这样声明:

public class MyXMLHelper {

或者，如果您希望能够对其进行子类化(Xcode 8 beta 6):

open class MyXMLHelper {