在 Xcode 中为 C++ 项目构建包装框架

路易斯

所以,我有一个 C++ 项目,我想将它放入一个框架中,该框架将充当 C++ 代码的包装器(用 Objective-C/C++ 编写),以便我以后可以在 Swift 或 Objective-C 项目中使用它通过简单地将框架添加到应用程序。

到目前为止我已经完成了:

  • 创建了所有包装器
  • 在构建阶段公开包装器的公共标头
  • 在构建阶段添加了一个运行脚本,以简单地将所有 C++ 头文件(保留其文件目录结构)复制到框架的目录中,以便使用框架的应用程序可以使用它们。我这样做而不是仅仅将它们放在构建阶段的标题字段中的原因是因为有很多文件和文件夹并且这样做需要我将每个标题更改为#include "LocalHeader.h"而不是它当前的编写方式#include "CppRootFolder/Subfolder/Header.h". 我也不想这样做,因为我想保持 C++ 文件不变。

问题:

一切似乎都运行良好,除了在构建实际应用程序时,xcode 会出错,说它无法在文件结构中找到文件。为了说明我的意思,我有以下几点:

  • 框架的伞文件#include "CppRootFolder/umbrella.h"(c++ 伞文件)
  • 在 CppRootFolder/umbrella.h 中,我有几个 #include "CppRootFolder/Subfolder/Header.h"
  • 每个子文件夹中的每个头文件都包含从 C++ 代码的根文件夹引用它们的其他头文件。

我对此的看法:

我似乎很清楚问题在于编译器需要从 C++ 代码的根文件夹中找到头文件。因此,在实际的应用程序中,在构建设置中,我将标题搜索路径添加到:$BUILT_PRODUCTS_DIR/FrameworkName.framework/Headers,这是我使用脚本复制所有标题的地方。但是,构建失败并产生大量随机错误,无法识别已定义的类型。

关于如何让它发挥作用的任何想法?

谢谢

更新(日志):

<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "Headers/Box2D.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D.h:17:9: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D.h:17:
#import "World.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/World.h:10:9: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/World.h:10:
#import "Box2D/Box2D.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Box2D.h:34:10: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Box2D.h:34:
#include "Box2D/Common/b2Settings.h"
         ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Common/b2Settings.h:153:8: error: must use 'struct' tag to refer to type 'b2Version'
extern b2Version b2_version;
       ^
<module-includes>:1:9: note: in file included from <module-includes>:1:
#import "Headers/Box2D.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D.h:17:9: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D.h:17:
#import "World.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/World.h:10:9: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/World.h:10:
#import "Box2D/Box2D.h"
        ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Box2D.h:35:10: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Box2D.h:35:
#include "Box2D/Common/b2Draw.h"
         ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Common/b2Draw.h:22:10: note: in file included from /Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Common/b2Draw.h:22:
#include "Box2D/Common/b2Math.h"
         ^
/Users/luis/Library/Developer/Xcode/DerivedData/Project-dgathvjusrdgslfvqqcvkeqyjzcb/Build/Products/Debug-iphoneos/Box2D.framework/Headers/Box2D/Common/b2Math.h:28:31: error: unexpected type name 'int32': expected expression
        int32 ix = *reinterpret_cast<int32*>(&x);
马雷克

当您编写包装器时,C++ 不应在外部可见。因此#include "cppHedarFile.h"不应在包装器外部访问,否则您将在 Objective C 代码中使用 C++ 时出错。

所以不应该有 C++ 头文件的伞头文件。

请提供技术细节:复制粘贴您看到的错误消息。您对错误的解释可能会产生误导。


除了这一行,您没有粘贴所有内容:

/Box2D.framework/Headers/Box2D/Common/b2Math.h:28:31: error: unexpected type name 'int32': expected expression
    int32 ix = *reinterpret_cast<int32*>(&x);

告诉我我是对的。很可能您包含了来自 Objective C 文件的 C++ 头文件*.m对于此类文件,无法访问 C++ 标准头文件,这int32就是无法识别类型的原因

就像我写的乞讨。当您围绕 C++ 编写 Objective C 包装器时,禁止从公共头文件中包含 C++ 头文件。您只能*.mm从内部标头的表单文件中执行此操作,这些标头仅由*.mm. 这样包装器就可以完成他们的工作并从包装器的用户那里处理 C++。


例子

公共标题KXSomeClass.h

@interface KXSomeClass : NSObject

@property (nonatomic, readonly) BOOL allowed;

- (NSUInteger)someAction:(NSString *)s;

@end

私有标头 KXSomeClass+Internal.h

// this header is used only by wrappers
#import "KXSomeClass.h"
#include <memory>
@interface KXSomeClass ()

- (instancetype)initWithNativeSomeClass:(const std::shared_ptr<SomeClass>&)nativeObject;

@end

执行 KXSomeClass.mm

#import "KXSomeClass+Internal.h"

@interface KXSomeClass ()
@property (assign, nonatomic) std::shared_ptr<SomeClass> native;
@end

#import "KXSomeClass+Internal.h"
#include "cpp/SomeClass.h"

@implementation CSCapability

- (instancetype)initWithNativeSomeClass:(const std::shared_ptr<SomeClass>&)nativeObject
{
    if (self = [super init]) {
         _native = nativeObject;
    }
    return self;
}

- (NSUInteger)someAction:(NSString *)s
{
    return _native->SomeAction(s.UTF8String);
}

- (BOOL)allowed
{
    return _native->Allowed();
}

@end

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