小贝子编程

创建跨平台 C++ 触摸管理器.在 c++ 中传递 Objective-c 对象涉及代码



所以我正在尝试创建一个可以跨平台(iOS，Android等(使用的多点触控类。目标是引擎不需要知道平台即可获得更新的触摸数据。

现在我正在做总体设计，并专门实现iOS端。Android等方面将在很久以后出现。

为此，我正在尝试使用委派模式。实际上只有两个界面项。

有一个方法更新(浮点数dt(要用dt在每个新帧上调用。然后，此方法将返回有关所有触摸的信息的 c++ 结构，或者可能设置可以访问的属性。我不确定。

在 iOS 端，唯一需要从外部调用的其他函数是 touchesDown，它传入 UITouches 和它们所在的 UIView 的 NSSet*。

这是我到目前为止正在使用的设计

Multitouch
PlatformTouchManager.h (C++ Abstract Class with Update)
iOS
iOSMultiTouch.cpp (Objective-c++)
iOSMultiTouch.hpp (Objective-c++ Class inheriting PlatformTouchManager)
MultTouch.cpp (C++)
MultiTouch.h (C++ class)

这里是PlatformTouchManager.h

#define MAX_TOUCHES 5
#define PLATFORM_iOS
//#define PLATFORM_ANDROID
class PlatformTouchManager {
public:
// Update All The Events
virtual void update(float time) = 0;
};

当然还有多点触控。

class Multitouch {
private:
PlatformTouchManager* manager;
public:
Multitouch() {
#ifdef PLATFORM_iOS
manager = new iOSMultiTouch();
#endif
}
~Multitouch() {
delete manager;
}
Multitouch(const Multitouch&) = delete;
void update(float dt);
void* getManager() {
return manager;
}
};

最后是iOSMultiTouch.hpp

#include <stdio.h>
#include "../PlatformTouchManager.h"
#include <set>
#import <UIKit/UIKit.h>
class iOSMultiTouch: public PlatformTouchManager {
public:
// Initializer
iOSMultiTouch();
// Destructor
~iOSMultiTouch();
// Update All The Events
void update(float time);
// Touch Down Set
void touchesDown(id<NSSet> set, id<UIView> view);
};

值得注意的是，这段代码包含在MultiTouch.h(c ++(和我的原生视图代码中，即objective-c++。

因此，跨平台引擎会创建一个多点触控对象，保留引用，并且每个帧调用都会更新。

我想象iOS UIView将从跨平台引擎获得Multitouch*。将其转换为iOSMultiTouch*对象，并在委托上调用touchesDown:(NSSet *)touches withEvent:(IUView *)view。

我这样做遇到了严重的问题。

如果我尝试在iOSMUltiTouch.hpp中导入UIKit，则会导致构建混乱，因此看起来我只能将其导入源文件中。因此，我的触地方法需要无效touchesDown(void* touches, void* view);.

然后问题在于实现这一点，因为当我尝试将这些void*指针转换为正确的类型时，我得到警告Cast of C pointer type void* to objective-c pointer type id requires a bridged cast。

我知道这里有一些 ARC 问题，因为 ARC 在投射到原始指针时无法跟踪这些事情，但我该如何解决这个问题？

iOSTouchManager确实需要保持对UITouch对象的强引用，直到帧释放触摸之后。

如何实现此转换？我应该有没有其他方法来设计我的类来简化这一点？

对于那些想知道这些是弹出的错误，如果您从iOSMultiTouch.hpp导入uikit，就会弹出

Parse Issue
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:512:1: Expected unqualified-id
../Multitouch/MultiTouch.cpp:9:10: In file included from ../Multitouch/MultiTouch.cpp:9:
../Multitouch/MultiTouch.h:15:10: In file included from ../Multitouch/MultiTouch.h:15:
../Multitouch/iOS/iOSMultiTouch.hpp:15:9: In file included from ../Multitouch/iOS/iOSMultiTouch.hpp:15:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSZone.h:9:1: Expected unqualified-id
../Multitouch/MultiTouch.cpp:9:10: In file included from ../Multitouch/MultiTouch.cpp:9:
../Multitouch/MultiTouch.h:15:10: In file included from ../Multitouch/MultiTouch.h:15:
../Multitouch/iOS/iOSMultiTouch.hpp:15:9: In file included from ../Multitouch/iOS/iOSMultiTouch.hpp:15:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:5:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObject.h:8:
Semantic Issues
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:514:9: Unknown type name 'NSString'
../Multitouch/MultiTouch.cpp:9:10: In file included from ../Multitouch/MultiTouch.cpp:9:
../Multitouch/MultiTouch.h:15:10: In file included from ../Multitouch/MultiTouch.h:15:
../Multitouch/iOS/iOSMultiTouch.hpp:15:9: In file included from ../Multitouch/iOS/iOSMultiTouch.hpp:15:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIKit.h:8:
Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:9: In file included from Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS12.0.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:

问题

您遇到了大量错误，因为您将iOS框架(UIKit(导入了C++文件(iOSMultiTouch.cpp(。

溶液

对于需要将iOS框架导入到的实现文件，必须使用.mm而不是扩展名.cpp。.cppC++扩展，而不是Objective-C++扩展。

在这种情况下，您需要将iOSMultiTouch.cpp重命名为iOSMultiTouch.mm.将void *替换为 Objective-C 指针，它将按预期工作。

Utils.h不会保留任何与 Objective-C 相关的内容，并且可以在任何地方使用。Utils.mm用于处理 Objective-C 部件。

Utils.h 

PlatformTouchManager* GetIOSTouchManager();

Utils.mm

#include "Utils.h"
#include "iOSMultiTouch.hpp"
PlatformTouchManager* GetIOSTouchManager() {
return new iOSMultiTouch();
};

多点触控

#include "Utils.h"
// Other include
class Multitouch {
private:
PlatformTouchManager* manager;
public:
Multitouch() {
#ifdef PLATFORM_iOS
manager = GetIOSTouchManager();
#endif
}
~Multitouch() {
delete manager;
}
Multitouch(const Multitouch&) = delete;
void update(float dt);
PlatformTouchManager* getManager() {
return manager;
}
};

相关内容

最新更新


热门标签：

javascript python java c# php android html jquery c++ css ios sql mysql arrays asp.net json python-3.x ruby-on-rails .net sql-server django objective-c excel regex ruby linux ajax iphone xml vba spring asp.net-mvc database wordpress string postgresql wpf windows xcode bash git oracle list vb.net multithreading eclipse algorithm macos powershell visual-studio image forms numpy scala function api selenium