Xcode10 - dyld: Library not loaded for pod install

问题:

I have a project with target frameworks.

• MainAppTarget
• FrameworkA

FrameworkA is the only one to use a certain pod, hence in my pod file I have something like

target 'MainAppTarget' do
    ...
end

target 'FrameworkA' do
    pod 'PodA'
end

the build succeeds with no problem, but when I run the app on a simulator the app crashes immediately with the following error message:

dyld: Library not loaded: @rpath/PodA.framework/PodA
  Referenced from: .../Build/Products/Development-iphonesimulator/FrameworkA.framework/FrameworkA
  Reason: image not found

I tried all the usual suspects (delete derived data, clean, pod deintegrate...) nothing worked so far.

Any idea why this would happen, and how I can make it work without having to install all the pods necessarily on both targets?

The app is in Swift 4.2.

回答1:

From your error message, there are a few things that should be checked.

dyld: Library not loaded: @rpath/PodA.framework/PodA
  Referenced from: .../Build/Products/Development-iphonesimulator/FrameworkA.framework/FrameworkA
  Reason: image not found

The first thing that seems odd is that the path for the framework that is being loaded (FrameworkA.framework) is not embedded inside an app. Check the "General" tab of the MainAppTarget and make sure the framework is appearing in the "Embedded Binaries" and "Linked Frameworks and Libraries" sections.

Second, @rpath is a shorthand for the runpath search path list, which tells dyld where to look for needed libraries.

Here's an example project on Github with a main app that uses one Cocoapod, and a dynamic framework that the main app depends on that uses a different Cocoapod: https://github.com/dtweston/FrameworkPodTest

Build settings that you should check on all of the targets that are involved (including the framework targets built by the Pods project):

• Runpath Search Paths (LD_RUNPATH_SEARCH_PATHS)
  • In the example project, these are determined by the cocoapod, but each one is set to $(inherited) @executable_path/Frameworks @loader_path/Frameworks
• Dynamic Library Install Name (LD_DYLIB_INSTALL_NAME)
  • In the example project, this is unchanged from the default $(DYLIB_INSTALL_NAME_BASE:standardizepath)/$(EXECUTABLE_PATH)
• Dynamic Library Install Name Base (DYLIB_INSTALL_NAME_BASE)
  • In the example project, set to @rpath (again determined by the Cocoapod)

Here's a screenshot of the built application bundle showing how it's laid out:

You can use otool to get information about how the application is assembled by xcodebuild.

Here's the main app binary:

otool -L FrameworkPodTest
FrameworkPodTest:
    @rpath/KeychainSwift.framework/KeychainSwift (compatibility version 1.0.0, current version 1.0.0)
    @rpath/Lottie.framework/Lottie (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 61000.0.0)
    @rpath/Framework.framework/Framework (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 1560.10.0)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.200.5)
    /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (compatibility version 64.0.0, current version 1245.9.2)
...

And the framework binary:

otool -L Frameworks/Framework.framework/Framework
Frameworks/Framework.framework/Framework:
    @rpath/Framework.framework/Framework (compatibility version 1.0.0, current version 1.0.0)
    @rpath/KeychainSwift.framework/KeychainSwift (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 1560.10.0)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 228.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 1252.200.5)
    @rpath/libswiftCore.dylib (compatibility version 1.0.0, current version 1000.11.42)
    @rpath/libswiftCoreFoundation.dylib (compatibility version 1.0.0, current version 1000.11.42)
...

回答2:

The reason the build succeeds is that the PodA framework is visible to the FrameworkA during compilation (it can link to it), but when the application launches, then it tries to find and load the dynamic framework PodA required by the FrameworkA, and it looks like the PodA is not embedded in the MainAppTarget, so the app crashes with the error message you saw.

To fix this, make sure that the PodA framework is embedded in the MainAppTarget. Specifically, you need to make sure that the final app bundle contains the PodA.framework in the Framewokrs subfolder. Usually cocoapods copies the frameworks automatically.

Check that the Build Phases for the MainAppTarget contains cocoapods's [CP] Embed Pods Frameworks and that the scripts' input files contain the path to the PodA framework. Something like this (example shows Alamofire pod):

I have set up a project with the details you posted, but it looks to me that cocoapods handles this case automatically in the created workspace setup (you can take a look at my demo project here: https://github.com/DmitryBespalov/StackOverflowPodFramework). If your setup is different, please let me know of the details and I can help you further with that.

回答3:

I too was facing the same problem. All you need to do is set the third party frameworks you are using for e.g:- PodA as Optional instead of Required under Link binary with Libraries in build Phases section. That's all. try it again and it will run as expected.

Note:- You need to add the PodA in the app in which you are using your framework. There is no other way except create a static framework consisting your PodA and use this newly created static framework inside your dynamic framework.

回答4:

At first, check whether your CocoaPod is compatible (supported) or not.

Make sure you dragged FrameworkA to the Embedded Binaries section in your project's General settings tab. Also make sure you have Embed Frameworks (1 item) in Build Phases tab and FrameworkA is included there.

Here's a solution:

Step One: Drag and drop FrameworkA.framework in your project navigation. Link framework and Library added this library.

Step Two: In Xcode go to Project > General > Embedded Binary > Add FrameworkA.framework.

Step Three: Make sure that in Build Phases tab Link Binary with Libraries (1 item) and Embed Frameworks (1 item) do exist.

P.S. I did it in Xcode 10.2.1 but in Xcode 10.1 it works the same way.

回答5:

You have to add pod 'PodA' in FrameworkA target into MainAppTarget also.

target 'MainAppTarget' do
  pod 'PodA'
end

target 'FrameworkA' do
  pod 'PodA'
end

回答6:

This problem is just on iOS 13.3.1.

You can't fix it, Just you have to downgrade to iOS 13.3 or wait for Xcode new update.