Swift iTunes ScriptingBridge链接器错误 [英] Swift iTunes ScriptingBridge linker error

问题描述

我已经大量搜寻这个问题的答案，但没有找到，所以我在这里问。我想读使用SWIFT在iTunes当前曲目，但每当我尝试引用任何iTunes的类（iTunesApplication，iTunesTrack等），我得到以下错误：

 适用于建筑x86_64的未定义符号：
_OBJC_CLASS _ $ _ iTunesApplication，从引用：在iTunesWrapper.o $ b在iTunesWrapper.o 
 __TMaCSo17iTunesApplication 
 __TFC8WAILT_v213iTunesWrapper17getSongWithFormatfS0_FTSS3sepSS10timeOnLeftSb_SS $ b LD：符号（S）没有发现建筑x86_64的
铛：错误：连接命令，退出代码1（使用-v看看调用）
   
 
 
任何想法，为什么会这样？
 
 
 
谢谢，结果
 -tlf 
 
 PS如果我使用Obj-C，它的工作就好了。它只有当我使用雨燕的错误。
 
 
解决方案
由于斯威夫特的强静态类型的
，它与它不代码链接问题没有一个实现或二进制。因此，要使用Objective-C的桥接报头有了它，你将很可能需要使用通用 SBObject 是因为斯威夫特知道这些的实施，即使你的.h声明其他类。 
 
 
 
另一种方法是使用脚本生成一个可以看到和使用的带有声明的本地Swift文件。 这里是一个Python脚本（完全公开：它是我的）生成Objective-C脚本桥头然后创建一个本地Swift版本。这避免了链接器错误和上述SBObject通用类型。
 
I have searched extensively for an answer to this, but have found none, so I'm asking here. I am trying to read the current track in iTunes using Swift, but whenever I try to reference any of the iTunes classes (iTunesApplication, iTunesTrack, etc) I get the following error:
Undefined symbols for architecture x86_64:  
  "_OBJC_CLASS_$_iTunesApplication", referenced from:  
      __TFC8WAILT_v213iTunesWrapper17getSongWithFormatfS0_FTSS3sepSS10timeOnLeftSb_SS  in iTunesWrapper.o  
      __TMaCSo17iTunesApplication in iTunesWrapper.o  
ld: symbol(s) not found for architecture x86_64  
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Any idea why this is happening?

Thanks,

-tlf

P.S. If I use Obj-C, it works just fine. It only errors when I am using Swift.
解决方案
Because of Swift's strong static typing, it has issues linking with code that it doesn't have either an implementation or a binary for. Therefore to use an Objective-C Bridging Header with it, you will most likely need to use generic SBObjects because Swift knows the implementation of those, even though your .h declares the other classes. 

An alternative is to use a script to generate a native Swift file with declarations that it can see and use. Here is a Python script (full disclosure: it's mine) that generates Objective-C Scripting Bridge headers then creates a native Swift version. This avoids Linker Errors and the aforementioned SBObject generic typing.

                        
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