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社区首页 >问答首页 >创建一个跨平台的c++触摸管理器。在c++中传递objects对象涉及代码。

问创建一个跨平台的c++触摸管理器。在c++中传递objects对象涉及代码。
EN

Stack Overflow用户
提问于 2018-09-09 19:51:27
回答 1查看 341关注 0票数 2

因此，我正在尝试创建一个可以跨平台使用的多点触摸类(iOS、Android等)。目标是引擎不需要知道平台来获得更新的触摸数据。

现在，我正在进行一般设计，并且正在专门实现iOS端。Android等方面将在很晚的时候到来。

为了做到这一点，我尝试使用委托模式。实际上只有两个接口项。

在每个新帧上都要调用一个方法更新(Float)，然后这个方法将返回一个关于所有触点的c++结构，或者设置一个可以访问的属性。我不确定。

在iOS方面，需要从外部调用的唯一其他函数是touchesDown，它传入UITouches的NSSet*和它们所在的UIView。

这是我目前正在进行的设计。

代码语言：javascript
复制
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)

这是PlatformTouchManager.h

代码语言：javascript
复制
#define MAX_TOUCHES 5
#define PLATFORM_iOS
//#define PLATFORM_ANDROID

class PlatformTouchManager {
public:
    // Update All The Events
    virtual void update(float time) = 0;
};

当然还有多重触控

代码语言：javascript
复制
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

代码语言：javascript
复制
#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，这段代码是由MultiTouch.h (c++)和目标-c++的原生视图代码包含的。

因此，跨平台引擎创建了一个多点触摸对象，保存了一个引用，并更新了每个帧调用。

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

我做这件事有很严重的问题。

如果我试图在UIKit中导入iOSMUltiTouch.hpp，它会导致构建混乱，所以我只能在源文件中导入它。因此，我的触摸方法需要是无效的touchesDown(void* touches, void* view);.。

问题是实现这一点，因为当我尝试将这些void*指针转换为它们的适当类型时，就会得到警告Cast of C pointer type void* to objective-c pointer type id requires a bridged cast。

据我所知，这里有一些ARC问题，因为ARC无法跟踪这些被抛入原始指针的东西，但我该如何绕过这个问题呢？

iOSTouchManager确实需要保持对UITouch对象的强烈引用，直到框架释放之后。

如何实现此强制转换？有什么不同的方法，我应该设计我的课程，使这更容易吗？

对于那些想知道这些错误的人来说，如果您从iOSMultiTouch.hpp导入uikit，就会出现这些错误。

代码语言：javascript
复制
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:
c++
objective-c
xcode
uikit
EN

回答 1

Stack Overflow用户

回答已采纳

发布于 2018-09-12 07:14:26

问题

由于您在一个iOS文件(iOSMultiTouch.cpp)中导入了C++框架(UIKit)，所以出现了大量错误。

解决方案

对于需要导入iOS框架的实现文件，您必须使用.mm而不是.cpp扩展。.cpp是C++扩展，而不是目标-C++扩展.

在这种情况下，需要将iOSMultiTouch.cpp重命名为iOSMultiTouch.mm。用Objective指针替换void *，它将按预期工作。

Utils.h将保留与目标C无关的内容，并且可以在任何地方使用.Utils.mm用于与Objective部件一起工作.

Utils.h

代码语言：javascript
复制
PlatformTouchManager* GetIOSTouchManager();

Utils.mm

代码语言：javascript
复制
#include "Utils.h"
#include "iOSMultiTouch.hpp"

PlatformTouchManager* GetIOSTouchManager() {
  return new iOSMultiTouch();
};

Multitouch.h

代码语言：javascript
复制
#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;
  }
};
票数 2
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/52248165

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