程序中有两个UIView,高德地图的View在下层，Unity的View在上层，当鼠标点击到Unity中的UI或其他对象时，Unity截获点击消息，否则高德地图处理点击消息。
一：Unity设置NGUI Camera
Clear Flags 设置为：Solid Color
Background设置为黑色，alpha=0，完全透明
二：打包导出Xcode工程：
1.在Classes/UI/UnityView.mm中添加代码：
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
//判断一下渲染API是否为metal，OpenGLES暂未实现
if(UnitySelectedRenderingAPI() ==apiMetal)
{
// 获取渲染surface
UnityDisplaySurfaceMTL* surf = (UnityDisplaySurfaceMTL*)GetMainDisplaySurface();
// 渲染surface尺寸
CGSizes = ((CAMetalLayer*)self.layer).drawableSize;
// 得到点击坐标
CGPoint p = [self convertPoint:point toView:self];
// 坐标转换
CGFloatbw = self.bounds.size.width;
CGFloatbh = self.bounds.size.height;
CGFloatbox = self.bounds.origin.x;
CGFloatboy = 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
MTLTextureReflastTex = surf->lastSystemColorRB;
// 获取Texture中此坐标的颜色值
MTLRegion region = MTLRegionMake2D(x, y, 1, 1);
Byte byteBuff[4];
[lastTex getBytes:byteBuff bytesPerRow:_surfaceSize.width*4 fromRegion:region mipmapLevel:0];
// 判断Alpha值
int a = byteBuff[3];
if(a > 0 )
{
return YES;
}
else
{
return NO;
}
}
returnYES;
}
2：在Classes/Unity/UnityRendering.h中的UnityDisplaySurfaceMTL结构声明中，添加 OBJC_OBJECT_PTR MTLTextureRef lastSystemColorRB,用来保存上一帧渲染Texture。
unsigned colorFormat; // [MTLPixelFormat]
unsigned depthFormat; // [MTLPixelFormat]
/**新增代码**/
OBJC_OBJECT_PTR MTLTextureRef lastSystemColorRB;
/**新增代码**/
END_STRUCT(UnityDisplaySurfaceMTL)
3:在每次渲染前保存lastSystemColorRB,修改Classes/Unity/MetalHelper.mm的StartFrameRenderingMTL函数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];
/**新增代码**/
surface->lastSystemColorRB= surface->systemColorRB;
/**新增代码**/
// 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函数代码：
extern "C" void CreateSystemRenderingSurfaceMTL(UnityDisplaySurfaceMTL* surface)
{
DestroySystemRenderingSurfaceMTL(surface);
MTLPixelFormatcolorFormat = surface->srgb?MTLPixelFormatBGRA8Unorm_sRGB:MTLPixelFormatBGRA8Unorm;
surface->layer.presentsWithTransaction=NO;
surface->layer.drawsAsynchronously=YES;
#if UNITY_OSX
MetalUpdateDisplaySync();
#endif
//修改代码位置
CGFloat backgroundColorValues[] = {0, 0, 0, 0};
CGColorSpaceRefcolorSpaceRef =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;
//添加代码位置
surface->layer.opaque=NO;
surface->layer.framebufferOnly = NO;
surface->colorFormat = colorFormat;
}