程式中有兩個UIView,高德地圖的View在下層，Unity的View在上層，當滑鼠點選到Unity中的UI或其他物件時，Unity截獲點選訊息，否則高德地圖處理點選訊息。

一：Unity設定NGUI Camera

Clear Flags 設定為：Solid Color

Background設定為黑色，alpha=0，完全透明

二：打包匯出Xcode工程：

 1.在Classes/UI/UnityView.mm中新增程式碼：

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event

{

//判斷一下渲染API是否為metal，OpenGLES暫未實現

if(UnitySelectedRenderingAPI() == apiMetal)

{

// 獲取渲染surface

UnityDisplaySurfaceMTL* surf = (UnityDisplaySurfaceMTL*)GetMainDisplaySurface();

// 渲染surface尺寸

CGSize s = ((CAMetalLayer*)self.layer).drawableSize;

// 得到點選座標

CGPoint p = [self convertPoint:point toView:self];

// 座標轉換

CGFloat bw = self.bounds.size.

CGFloat bh = self.bounds.size.height;

CGFloat box = self.bounds.origin.x;

CGFloat boy = self.bounds.origin.y;

CGFloat x = (p.x - box)/bw * s.width;

CGFloat y = (p.y - boy)/bh * s.height;

// 得到上一次渲染的Texture

MTLTextureRef lastTex = surf->lastSystemColorRB;

// 獲取Texture中此座標的顏色值

MTLRegion region = MTLRegionMake2D

Byte byteBuff[4];

[lastTex getBytes:byteBuff bytesPerRow:_surfaceSize.width*4 fromRegion:region mipmapLevel:0];

// 判斷Alpha值

int a = byteBuff[3];

if(a > 0 )

{

return YES;

}

else

{

return NO;

}

}

returnYES;

}

2：在Classes/Unity/UnityRendering.h中的UnityDisplaySurfaceMTL結構宣告中，新增OBJC_OBJECT_PTR MTLTextureRef lastSystemColorRB,用來儲存上一幀渲染Texture。

unsigned colorFormat;// [MTLPixelFormat]

unsigned depthFormat;// [MTLPixelFormat]

/**新增程式碼**/

OBJC_OBJECT_PTR MTLTextureRef lastSystemColorRB;

/**新增程式碼**/

END_STRUCT(UnityDisplaySurfaceMTL)

extern "C" void StartFrameRenderingMTL(UnityDisplaySurfaceMTL* surface)

{

// in case of skipping present we want to nullify prev drawable explicitly to poke ARC

surface->drawable = nil;

surface->drawable = [surface->layer nextDrawable];

// on A7 SoC nextDrawable may be nil before locking the screen

if (!surface->drawable)

return;

surface->systemColorRB= [surface->drawable texture];

/**新增程式碼**/

surface->lastSystemColorRB = surface->systemColorRB;

/**新增程式碼**/

// screen disconnect notification comes asynchronously

// even better when preparing render we might still have [UIScreen screens].count == 2, but drawable would be nil already

if (surface->systemColorRB)

4:修改Classes/Unity/MetalHelper.mm的CreateSystemRenderingSurfaceMTL函式程式碼：

extern "C" void CreateSystemRenderingSurfaceMTL(UnityDisplaySurfaceMTL* surface)

{

DestroySystemRenderingSurfaceMTL(surface);

MTLPixelFormat colorFormat = surface->srgb ? MTLPixelFormatBGRA8Unorm_sRGB : MTLPixelFormatBGRA8Unorm;

surface->layer.presentsWithTransaction = NO;

surface->layer.drawsAsynchronously = YES;

#if UNITY_OSX

MetalUpdateDisplaySync();

#endif

//修改程式碼位置

CGFloat backgroundColorValues[] = {0, 0, 0, 0};

CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();

CGColorRef backgroundColorRef = CGColorCreate(colorSpaceRef, backgroundColorValues);

surface->layer.backgroundColor = backgroundColorRef; // retained automatically

CGColorRelease(backgroundColorRef);

CGColorSpaceRelease(colorSpaceRef);

surface->layer.device = surface->device;

surface->layer.pixelFormat = colorFormat;

//新增程式碼位置

surface->layer.opaque=NO;

surface->layer.framebufferOnly = NO;

surface->colorFormat = colorFormat;

}