swift的动态库

共享可执行文件 iOS 有沙箱机制，不能跨App间共享共态库，但Apple开放了App Extension，可以在App和Extension间共间动态库（这也许是Apple开放动态链接库的唯一原因了）。

http://blog.lanvige.com/2015/01/04/library-vs-framework-in-ios/?utm_source=tuicool&utm_medium=referral

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Introducing extensions in iOS8 seems to change this a bit,because extensions are separate executables. Sharing code between an extension and its containing app is done via a framework. Apple is saying this in their release notes:

Emphasis is mine.

Source: https://developer.apple.com/library/content/documentation/Xcode/Conceptual/WhatsNewXcode-Archive/Articles/xcode_6_0.html#//apple_ref/doc/uid/TP40014509-SW14

Further,in the extension dev guide,they explain that you can share code between an extension and the containing app via a "embedded framework".

Source: https://developer.apple.com/library/content/documentation/General/Conceptual/ExtensibilityPG/ExtensionScenarios.html#//apple_ref/doc/uid/TP40014214-CH21-SW1

My question is - what is an embedded framework,how does it differ from a dynamic framework,and will we really see proper dynamic linking in iOS8? All the documentation I‘ve read seems ambiguous about this.

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"Embedded" and "Dynamic" frameworks don‘t refer to the same aspect of frameworks. They are not the opposite of one another. First,let‘s define what‘s a framework: in Apple lingo,a framework refers to some compiled code + the public headers of said code.

• Now a dynamic framework is a framework whose code was built as a dynamic library. It is the opposite of a "static" framework,where the code would be built as a static library. In case you‘re wondering,Wikipedia has a very nice explanation of what‘s the difference between a static and a dynamic library.
• And finally,an embedded framework is a framework that is packaged within an app,as opposed to being installed system-wide,in "/System/Library/Frameworks" for example.

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An embedded framework is simply one that‘s included in the app bundle,rather than a global framework which is installed in system directory.

Dynamic Frameworks doesn‘t means dynamically linked framework. Apps still just work in a sandbox environment.

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https://stackoverflow.com/questions/25080914/does-ios-8-support-dynamic-linking