與ARC編譯時ImageKit錯誤和警告

Question

我試圖將我的項目轉換爲ARC，但我在我的項目中使用ImageKit。 ARC重構工具和我自己的手動重構都會在ImageKit頭文件中使用ARC生成錯誤和警告，這些錯誤和警告已包含在我自己的源文件中。他們看起來像這樣：

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))) 
          ^

這就是當我設置我的項目設置爲目標10.6。當目標10.7，我只是得到警告：

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. 

但我至少可以構建和定位只是ARC 10.7運行時，我的程序。

這是怎麼回事？這是正常的嗎？或者ImageKit與ARC不兼容？

Answer 1

原來，Xcode 4.2是barfing，因爲我直接導入<ImageKit/ImageKit.h>，並且只有ImageKit框架鏈接在我的代碼中。非ARC代碼很好，但ARC不喜歡這樣。

切換到導入<石英/ Quartz.h >（其還包括ImageKit）和鏈接整個Quartz框架解決了這個問題。 [更新：看起來你不必鏈接整個Quartz框架。將導入更改爲<Quartz/Quartz.h>並保持直接鏈接ImageKit。]

這很奇怪。