cocoa - 使用 ARC 编译时 ImageKit 错误和警告

Question

我正在尝试将我的项目转换为 ARC，但我在项目中使用 ImageKit。 ARC 重构工具和我自己的手动重构都会在 ImageKit 头文件中产生 ARC 错误和警告，这些头文件已包含在我自己的源文件中。它们看起来像这样:

In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:9:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFOperation.m:10:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserView.h:176:14: error: the current deployment target does not support automated __weak references [4]
     IBOutlet __weak NSScroller*                   _horizontalScroller;
              ^
<built-in>:115:31: note: instantiated from:
 #define __weak __attribute__((objc_ownership(weak)))
                               ^
In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:9:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFOperation.m:10:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserView.h:177:14: error: the current deployment target does not support automated __weak references [4]
     IBOutlet __weak id                            _delegate;
              ^
<built-in>:115:31: note: instantiated from:
 #define __weak __attribute__((objc_ownership(weak)))
                               ^
In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:9:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFOperation.m:10:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserView.h:179:11: warning: '__strong' only applies to objective-c object or block pointer types; type here is 'void *' [3]
     void* __strong                                _reserved;
           ^
In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:10:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFOperation.m:10:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserCell.h:36:2: error: the current deployment target does not support automated __weak references [4]
         __weak id                   _parent;
         ^
<built-in>:115:31: note: instantiated from:
 #define __weak __attribute__((objc_ownership(weak)))
                               ^

那时我将项目设置设置为目标 10.6。当目标为 10.7 时，我只会收到警告:

In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:9:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFGenerator.m:12:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserView.h:179:11: warning: '__strong' only applies to objective-c object or block pointer types; type here is 'void *' [3]
     void* __strong                                _reserved;
           ^
In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:10:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFGenerator.m:12:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKImageBrowserCell.h:37:8: warning: '__strong' only applies to objective-c object or block pointer types; type here is 'void *' [3]
         void* __strong              _ibCellReserved;
               ^
In file included from /Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/ImageKit.h:13:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFController.h:12:
In file included from /Volumes/Macintosh HD/Users/simone/Development/AFGenerator.m:12:
/Developer/SDKs/MacOSX10.7.sdk/System/Library/Frameworks/Quartz.framework/Versions/A/Frameworks/ImageKit.framework/Headers/IKPictureTaker.h:31:11: warning: '__strong' only applies to objective-c object or block pointer types; type here is 'void *' [3]
     void *__strong _ikReserved;
           ^
3 warnings generated.

但是当我使用 ARC 只针对 10.7 时，我至少可以构建并运行我的程序。

这是怎么回事？这是正常的吗？或者 ImageKit 只是与 ARC 不兼容？

Answer 1

结果 Xcode 4.2 崩溃了，因为我直接导入 ，并且在我的代码中只链接了 ImageKit 框架。这对于非 ARC 代码来说很好，但 ARC 不喜欢这样。

切换到导入 (进一步包括ImageKit) 并链接整个Quartz框架解决了这个问题。 [更新:看起来您不必链接整个 Quartz 框架。将导入更改为 并继续直接链接 ImageKit。]

这很奇怪。