xcode 为什么我在使用 Swift Cocoa App 和桥接头时收到未声明类型的“PubNub”编译器错误？
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Why am I getting an undeclared type 'PubNub' compiler error with Swift Cocoa App and bridging header?
提问by Jim Hankins
I am starting a new Cocoa Swift Project that is incorporating the PubNub SDK via CocoaPods with the following Podfile:
我正在启动一个新的 Cocoa Swift 项目，该项目通过 CocoaPods 将 PubNub SDK 与以下 Podfile 合并：
target 'myProject' do
source 'https://github.com/CocoaPods/Specs.git'
use_frameworks!
pod 'PubNub', '~>4.0'
pod 'Alamofire', '~> 1.3'
end
target 'myProjectTests' do
end
In my auto-generated bridging header I have the import for PubNub as:
在我自动生成的桥接头中，我将 PubNub 导入为：
#import <PubNub/PubNub.h>
And my AppDelegate.swift file:
还有我的 AppDelegate.swift 文件：
import Cocoa
@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
var client:PubNub?
func applicationDidFinishLaunching(aNotification: NSNotification) {
let config = PNConfiguration( publishKey: "Your_Pub_Key", subscribeKey: "Your_Sub_Key")
client = PubNub.clientWithConfiguration(config)
client?.addListener(self)
client?.subscribeToChannels(["Your_Channel"], withPresence: false)
client?.publish("Swift + PubNub!", toChannel: "demo", compressed: false, withCompletion: nil) }
func client(client: PubNub!, didReceiveMessage message: PNMessageResult!) {
println(message)
}
func applicationWillTerminate(aNotification: NSNotification) {
// Insert code here to tear down your application
}
}
The project fails to build due to compiler errors on use of undeclared type PubNub. I've checked the build settings and the Swift Compiler - Code Generation section shows it's pointed to the bridging header file of the target (auto-populated).
由于使用未声明的类型 PubNub 时出现编译器错误，项目无法构建。我检查了构建设置，Swift Compiler - Code Generation 部分显示它指向目标的桥接头文件（自动填充）。
Using Xcode 6.4 and pods version 0.38.2
使用 Xcode 6.4 和 pods 版本 0.38.2
回答by SwiftArchitect
No Bridging-Header when Importing External Frameworks
导入外部框架时没有桥接头
Straight from Apple Developer Documentation:
直接来自Apple 开发者文档：
You can import external frameworks that have a pure Objective-Ccodebase, a pure Swiftcodebase, or a mixed-languagecodebase. [...] You can import a frameworkinto any Swift file within a different target using the following syntax:
您可以导入具有纯 Objective-C代码库、纯 Swift代码库或混合语言代码库的外部框架。[...] 您可以使用以下语法将框架导入不同目标中的任何 Swift 文件：
import FrameworkName
Fix
使固定
Add import PubNubframework.
添加import PubNub框架。
import UIKit
import PubNub
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var client:PubNub?
// ...
}
With a single import, PubNubis declared, auto-completesin Xcode editor, compiles, links, builds and runs.
使用单个import,PubNub声明，在 Xcode 编辑器中自动完成、编译、链接、构建和运行。
Step-by-step Swift Framework Tutorial
Swift 框架分步教程
Since many comments below imply that Bridging-Headers are always required, wrongly so when using External Frameworks as is presently the case with the use_frameworks!directive in the Podfile, find here a pure Swiftsolution. It is followed by an Xcodeproject you can download and experience with.
由于下面的许多评论暗示桥接头总是需要的，所以当使用外部框架时是错误的，就像目前在 中的use_frameworks!指令的情况一样，在Podfile这里找到一个纯 Swift解决方案。接下来是一个Xcode您可以下载并体验的项目。
Unambiguously documented in the iOS Developer Library, in concept Using Swift with Cocoa and Objective-C, chapter Mix and Match, section Swift and Objective-C in the Same Project, paragraph Importing External Frameworks:
明确记录在iOS 开发人员库中，在概念中使用 Swift 与 Cocoa 和 Objective-C，混合和匹配章节，同一项目中的 Swift 和 Objective-C部分，导入外部框架段落：
The process for importing an external framework is the samewhether the framework is written in a single language or contains files from both languages.
无论框架是用一种语言编写的还是包含两种语言的文件，导入外部框架的过程都是相同的。
Podfile
播客文件
platform :ios, '8.0'
use_frameworks!
target 'SO-31642385' do
pod 'PubNub', '~>4.0'
pod 'Alamofire', '~> 1.3'
end
Install the pods
安装豆荚
] pod install
Downloading dependencies
Installing Alamofire (1.3.1)
Installing CocoaLumberHyman (2.0.0)
Installing PubNub (4.0.4)
Generating Pods project
Integrating client project
Please close any current Xcode sessions and use `SO-31642385.xcworkspace` for this project from now on.
Import Framework
导入框架
import UIKit
import PubNub
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var client:PubNub?
func application(_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions:
[UIApplicationLaunchOptionsKey: Any]?) -> Bool {
self.client = PubNub()
return true
}
// ...
}
? Find this solution on GitHuband additional details on Swift Recipes.
? 在GitHub 上找到此解决方案，在Swift Recipes上找到更多详细信息。
