iOS+Unity iOS项目整合 Unity AR+3D（Unity5.4.0 Xcode8.3 OC语言）

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swift整合版详见-->swift4.0+xCode9.1+Unity5.4

1、项目准备

工程截图.png

Unity工程.png

1.1 首先要有一个Unity工程和IOS工程
1.2 Unity导出时可选 模拟器模式 和 真机模式，导出后只能在对应的设备运行
1.3 确保导出的unity可以直接运行
1.4 建议在将Unity和IOS放在同一目录下

2.导入

拖动.png

group.png

2.1 在xcode中创建一个group，例如“Unity”，主要便于分类
2.2 拖入操作有三个选项，是否复制、创建组或者关联、添加到目标
建议都不要复制（复制会将内容添加到IOS项目中，后续替换起来麻烦）
而参见1.4操作，更新时，每次替换Unity目录即可
2.3 Classes和Libraries 选择groups
Data文件选择reference
网上很多教程要删除Unity下的一些.h文件，不删也没关系（因为头文件太多，每次删都要好久，只要你不点开，这个只会对你的xcodeproj文件大小有一点点很小的影响）
2.4 特别的，如果使用VR功能，Data文件夹下Raw文件夹中的QCAR和Vuforia要再拖一次放在根目录（原因不明），如下图

vr.png

3 添加framework

framework.png

3.1 就是这么多。。。大家也可以参照导出的Unity工程下的Framework进行添加

4 配置

打开Building Setting

 Build Optons
      Enable Bitcode    NO
 Linking    
     Other Linker Flags
          -weak_framework
          CoreMotion
          -weak-lSystem
          -Wl,-undefined,dynamic_lookup **可以不加，如果报metal相关的错误可以加一下**
Other C Flags
      -DINIT_SCRIPTING_BACKEND=1
C Language Dialect
        选择 C99 
C++ Language Dialect 
        选择 C++ 11

4.1 Search Path
添加头文件路径和库文件路径

头文件.png

这里不用手打，可以直接拖进去添加
4.2 库路径

库文件.png

如果导出的Unity下有 plugin/ios 也添加进去
4.3 如果报头文件找不到之类的错误，看这里是否把包含头文件的路径都添加进去了
4.4 如果报link错误，看库路径是否都添加完整

4.5 其他配置

其他配置1.png

其他配置2.png

**关于配置部分比较麻烦，有两个方式参考：
1、参照导出的Unity项目的Building Setting
2、参照nerd （大神？）的视频教程， 原地址https://vimeo.com/145572230 （不太稳定）
**

5. 文件修改

5.1 修改pch
创建一个新的pch文件，找到原有的pch文件，复制到自定义的pch文件，并添加一行，如下图

原有的pch.png

自定义的pch.png

5.2 Building Setting中修改

添加pch路径.png

5.3 修改main文件
找到Unity的main.mm文件，直接复制到ios的main.m文件中（原有内容注释或者删除），并将文件名改为main.mm
找到

const char* AppControllerClassName = "UnityAppController";

替换为

const char* AppControllerClassName = "AppDelegate";

5.4 打开Build Phases 搜索main.mm会有两个文件，删除Unity下的main.mm(否则会编译冲突)
（如果报错，duplicate xxx 多半是因为这个文件重复）

6 工程文件修改

6.1 APPDelegate.h

#import 

@interface AppDelegate : UIResponder 
@property (strong, nonatomic) UIWindow *window;
@property (strong,nonatomic) UnityAppController *unityAppController;
//@property (nonatomic,strong) UINavigationController *navVC;
@property (nonatomic, strong) UIWindow *unityWindow;
- (void)hideUnityWindow;
- (void)showUnityWindow;
@end

6.2 APPDelegate.m

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

// Unity相关方法
- (UIWindow *)unityWindow{
    return UnityGetMainWindow();
}

- (void)showUnityWindow{
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [backButton setImage:[UIImage imageNamed:@"close.png"] forState:UIControlStateNormal];
    [backButton setAlpha:0.4];
    [backButton setFrame:CGRectMake(self.unityWindow.frame.size.width-60, 10, 50, 50)];
    [backButton addTarget:self action:@selector(hideUnityWindow) forControlEvents:UIControlEventTouchUpInside];

    [self.unityWindow addSubview:backButton];
    [self.unityWindow makeKeyAndVisible];
}

- (void)hideUnityWindow{
    [self.window makeKeyAndVisible];
}


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.unityAppController=[[UnityAppController alloc] init];
    [self.unityAppController application:application didFinishLaunchingWithOptions:launchOptions];
    
    return YES;
}


- (void)applicationWillResignActive:(UIApplication *)application {
   
    [self.unityAppController applicationWillResignActive:application];
}


- (void)applicationDidEnterBackground:(UIApplication *)application {
    [self.unityAppController applicationDidEnterBackground:application];
}


- (void)applicationWillEnterForeground:(UIApplication *)application {
    [self.unityAppController applicationWillEnterForeground:application];
}


- (void)applicationDidBecomeActive:(UIApplication *)application {
    [self.unityAppController applicationDidBecomeActive:application];
}


- (void)applicationWillTerminate:(UIApplication *)application {
    [self.unityAppController applicationWillTerminate:application];
}


@end

6.3 UnityAppController.h

两个地方
@class UnityViewControllerBase;

#import "AppDelegate.h"
inline UnityAppController* GetAppController(){
   AppDelegate *delegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
   return delegate.unityAppController;
}

#pragma once

#import 

#include "PluginBase/RenderPluginDelegate.h"

@class UnityView;
@class UnityViewControllerBase;
@class DisplayConnection;

@interface UnityAppController : NSObject
{
    UnityView*          _unityView;
    CADisplayLink*      _displayLink;

    UIWindow*           _window;
    UIView*             _rootView;
    UIViewController*   _rootController;
    UIView*             _snapshotView;

    DisplayConnection*  _mainDisplay;

    // we will cache view controllers for fixed orientation
    // auto-rotation view contoller goes to index=0
    UnityViewControllerBase* _viewControllerForOrientation[5];
#if !UNITY_TVOS
    UIInterfaceOrientation  _curOrientation;
#endif

    id    _renderDelegate;
}

// override it to add your render plugin delegate
- (void)shouldAttachRenderDelegate;

// this one is called at the very end of didFinishLaunchingWithOptions:
// after views have been created but before initing engine itself
// override it to register plugins, tweak UI etc
- (void)preStartUnity;

// this one is called at first applicationDidBecomeActive
// NB: it will be started with delay 0, so it will run on next run loop iteration
// this is done to make sure that activity indicator animation starts before blocking loading
- (void)startUnity:(UIApplication*)application;

// this is a part of UIApplicationDelegate protocol starting with ios5
// setter will be generated empty
@property (retain, nonatomic) UIWindow* window;

@property (readonly, copy, nonatomic) UnityView*            unityView;
@property (readonly, copy, nonatomic) CADisplayLink*        unityDisplayLink;

@property (readonly, copy, nonatomic) UIView*               rootView;
@property (readonly, copy, nonatomic) UIViewController*     rootViewController;
@property (readonly, copy, nonatomic) DisplayConnection*    mainDisplay;

#if !UNITY_TVOS
@property (readonly, nonatomic) UIInterfaceOrientation      interfaceOrientation;
#endif

@property (nonatomic, retain) id                            renderDelegate;
@property (nonatomic, copy)                                 void(^quitHandler)();

@end

// Put this into mm file with your subclass implementation
// pass subclass name to define

#define IMPL_APP_CONTROLLER_SUBCLASS(ClassName) \
@interface ClassName(OverrideAppDelegate)       \
{                                               \
}                                               \
+(void)load;                                    \
@end                                            \
@implementation ClassName(OverrideAppDelegate)  \
+(void)load                                     \
{                                               \
    extern const char* AppControllerClassName;  \
    AppControllerClassName = #ClassName;        \
}                                               \
@end

#import "AppDelegate.h"

inline UnityAppController*  GetAppController()
{
    AppDelegate *delegate = (AppDelegate*)[UIApplication sharedApplication].delegate;
    return delegate.unityAppController;
}

#define APP_CONTROLLER_RENDER_PLUGIN_METHOD(method)                         \
do {                                                                        \
    id delegate = GetAppController().renderDelegate;  \
    if([delegate respondsToSelector:@selector(method)])                     \
        [delegate method];                                                  \
} while(0)

#define APP_CONTROLLER_RENDER_PLUGIN_METHOD_ARG(method, arg)                \
do {                                                                        \
    id delegate = GetAppController().renderDelegate;  \
    if([delegate respondsToSelector:@selector(method:)])                    \
        [delegate method:arg];                                              \
} while(0)



// these are simple wrappers about ios api, added for convenience
void AppController_SendNotification(NSString* name);
void AppController_SendNotificationWithArg(NSString* name, id arg);

void AppController_SendUnityViewControllerNotification(NSString* name);

主要参照了the-nerd的文章
https://the-nerd.be/2015/11/13/integrate-unity-5-in-a-native-ios-app-with-xcode-7/
视频参见：https://vimeo.com/145572230 （经常无法解析）
重新在b站传了一份，参见：https://www.bilibili.com/video/av13740194/

以上，是使用两个window交互显示的方式，可以用最基本的Unitydemo测试一下，OK在导入完整的Unity项目。
至于如何在某个页面的某个View上显示Unity，下一篇再说