您将如何追溯导入框架的来源？答案

【问题标题】：How would you trace back the source of an imported framework?您将如何追溯导入框架的来源？
【发布时间】：2013-10-23 02:24:09
【问题描述】：

使用 Xcode 4 和 iOS 6 SDK 为了使用 QuartzCore.framework 中的类，您必须链接 QuartzCore.framework 和 #import <QuartzCore/QuartzCore.h>。这很好，而且很有意义。我对自己的世界观很满意 :)

在带有 iOS 7 SDK 的 Xcode 5 中，QuartzCore 标头似乎会自动导入。使用 CA 类不会引发警告或链接器错误。

我的问题是：

鉴于这些标头显然是从某个地方导入的并且库正在链接，我如何跟踪导入的来源和链接的框架？这更多只是为了我的好奇心和更多地了解这个过程，而不是解决特定问题。

其他信息：

模块已打开（默认情况下在 Xcode 5 中）但 @import 未在任何代码中使用。但是，将 Enable Modules (C and Objective-C) 和 Link Frameworks Automatically 都切换为“否”似乎不需要 QuartzCore 的#import 来编译。
关闭模块后，查看产品 |执行操作 | Preprocess 在预处理输出中显示 QuartzCore 标头。这解释了为什么代码可以编译，但不能解释它的来源。

otool 在其输出中没有显示任何 QuartzCore 框架：

$ otool -L Test 
Test:
    /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
    /System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 2903.2.0)
    /System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 1047.20.0)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)
    /usr/lib/libSystem.dylib (compatibility version 1.0.0, current version 111.0.0)

使用部分解决方案编辑

我至少找到了#import 的来源。检查 iOS 7 UIKit 标头后，UISlider 现在包含一个 <QuartzCore/QuartzCore.h> 的导入，这在 iOS 6 中是不存在的。谜团已解决，但缺少链接器错误仍然令人好奇。

【问题讨论】：

也许与UISlider 的导入所有QuartzCore 现在都链接到UIKit？我现在正在查看框架，QuartzCore 是 6.7MB，而UIKit 是 40.4MB！我怀疑 Apple 是否会允许如此巨大的疏忽，而且我不知道 iPhoneOS6.0SDK 的大小是多少。另外，我过去有多个定义链接器错误，我想如果是这种情况可能会发生这种情况。
P.S.我喜欢你每周的电子邮件。你摇滚！
链接器命令行是什么样的？

标签： ios objective-c xcode module linker

【解决方案1】：

看起来它正在被 UIKit 链接，可能与 LC_REEXPORT_DYLIB。

有关此 Twitter 线程的更多信息：https://twitter.com/daveverwer/status/390060215221354496

在 UIKit.framework 上运行 otool 显示它是链接的。

$ otool -L UIKit 
UIKit:
    /System/Library/Frameworks/UIKit.framework/UIKit (compatibility version 1.0.0, current version 2380.17.0)
    /System/Library/PrivateFrameworks/UIFoundation.framework/UIFoundation (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/CoreVideo.framework/CoreVideo (compatibility version 1.2.0, current version 1.8.0)
    /System/Library/Frameworks/VideoToolbox.framework/VideoToolbox (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/MobileAsset.framework/MobileAsset (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/TelephonyUtilities.framework/TelephonyUtilities (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/WebBookmarks.framework/WebBookmarks (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/BackBoardServices.framework/BackBoardServices (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/XPCObjects.framework/XPCObjects (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libicucore.A.dylib (compatibility version 1.0.0, current version 49.1.0)
    /System/Library/Frameworks/CoreImage.framework/CoreImage (compatibility version 1.0.0, current version 2.0.0)
    /System/Library/Frameworks/Security.framework/Security (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/DictionaryServices.framework/DictionaryServices (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/Foundation.framework/Foundation (compatibility version 300.0.0, current version 993.0.0)
    /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices (compatibility version 1.0.0, current version 14.0.0)
    /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
    /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation (compatibility version 150.0.0, current version 793.0.0)
    /usr/lib/libobjc.A.dylib (compatibility version 1.0.0, current version 227.0.0)
    /System/Library/Frameworks/ImageIO.framework/ImageIO (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/QuartzCore.framework/QuartzCore (compatibility version 1.2.0, current version 1.8.0)
    /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport (compatibility version 1.0.0, current version 29.0.0)
    /System/Library/Frameworks/CoreText.framework/CoreText (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices (compatibility version 1.0.0, current version 40.0.0)
    /usr/lib/libsqlite3.dylib (compatibility version 9.0.0, current version 9.6.0)
    /System/Library/PrivateFrameworks/WebKit.framework/WebKit (compatibility version 1.0.0, current version 536.26.0)
    /System/Library/PrivateFrameworks/WebCore.framework/WebCore (compatibility version 1.0.0, current version 536.26.0)
    /System/Library/PrivateFrameworks/ProofReader.framework/ProofReader (compatibility version 1.0.0, current version 180.0.0)
    /System/Library/Frameworks/CFNetwork.framework/CFNetwork (compatibility version 1.0.0, current version 609.1.4)
    /usr/lib/libAccessibility.dylib (compatibility version 1.0.0, current version 1.0.0)
    /System/Library/Frameworks/Accelerate.framework/Accelerate (compatibility version 1.0.0, current version 4.0.0)
    /System/Library/PrivateFrameworks/PrintKit.framework/PrintKit (compatibility version 1.0.0, current version 109.2.0)
    /usr/lib/libMobileGestalt.dylib (compatibility version 1.0.0, current version 1.0.0)
    /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 56.0.0)
    /usr/lib/libSystem.dylib (compatibility version 1.0.0, current version 125.0.0)

【讨论】：