UnityView transparent & touchable on Unity 5.3.3f1

HelloPlugin.cs

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;

public class HelloPlugin : MonoBehaviour
{
	[DllImport ("__Internal")]
	private static extern void hello_ ();

	[DllImport ("__Internal")]
	private static extern void init_ ();

	void Start ()
	{
		if (Application.platform == RuntimePlatform.IPhonePlayer) {
			init_ ();
		} else {
			Debug.Log ("init");
		}
	}

	public void hello ()
	{
		if (Application.platform == RuntimePlatform.IPhonePlayer) {
			hello_ ();
		} else {
			Debug.Log ("hello");
		}
	}
}

HelloPlugin.h

#import <Foundation/Foundation.h>

extern "C" {
    void hello_ ();
    void init_ ();
}

HelloPlugin.mm

#import "HelloPlugin.h"
#import <Mapbox/Mapbox.h>
#import "UnityView.h"
#import "UnityView+Touchable.h"

@implementation HelloPlugin

+ (UIWindow*) getWindow {
    UIWindow *window = [UIApplication sharedApplication].keyWindow;

    if (!window) {
        window = [UIApplication sharedApplication].windows[0];
    }

    return window;
}

+ (UnityView*) getUnityView {
    return [HelloPlugin getWindow].subviews[0];
}

+ (UIView*) createCustomView:(CGRect)frame {
    UIView* view = [[UIView alloc] initWithFrame:CGRectMake(frame.size.width/2, frame.size.height/2, frame.size.width/2, frame.size.height/2)];
    view.backgroundColor = [[UIColor alloc] initWithRed:0 green:0 blue:0 alpha:1];
    return view;
}

+ (UIView*) createMapView:(CGRect)frame {
    MGLMapView *mapView = [[MGLMapView alloc] initWithFrame:frame];
    mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    [mapView setCenterCoordinate:CLLocationCoordinate2DMake(40.7326808, -73.9843407)
                       zoomLevel:12 animated:NO];
    return mapView;
}

@end

void init_ () {
    [MGLAccountManager setAccessToken:@"YOUR TOKEN"];

    UIWindow* window = HelloPlugin.getWindow;
    UnityView* unityView = HelloPlugin.getUnityView;
    unityView.handleTouch = FALSE;

    UIView* mapView = [HelloPlugin createMapView:window.frame];
    [window addSubview:mapView];
    [window sendSubviewToBack:mapView];
}

void hello_ () {
    NSLog(@"Hello, Unity!");
}

MetalHelper.mm.patch

--- /Users/maruyama/git/unity/UnityMapBox/Exports/ios/Classes/Unity/MetalHelper.mm	2016-02-20 05:20:34.000000000 +0900
+++ MetalHelper.mm	2016-03-16 13:50:33.000000000 +0900
@@ -35,7 +35,8 @@

 	surface->layer.presentsWithTransaction = NO;
 	surface->layer.drawsAsynchronously = YES;
-	CGFloat backgroundColor[] = {0,0,0,1};
+	surface->layer.opaque = FALSE;
+	CGFloat backgroundColor[] = {0,0,0,0};
 	surface->layer.backgroundColor = CGColorCreate(CGColorSpaceCreateDeviceRGB(), backgroundColor);
 	surface->layer.device = surface->device;
 	surface->layer.pixelFormat = colorFormat;

Unity+Touchable.m

#import "UnityView+Touchable.h"
#import <objc/runtime.h>

@implementation UnityView(Touchable)

static char const * const kKeyHandleTouch = "handleTouch";

@dynamic handleTouch;

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    CGFloat thresholdX = [UIApplication sharedApplication].keyWindow.frame.size.width / 2;
    return (thresholdX > point.x) ? YES : NO;
}

- (void)setHandleTouch:(BOOL)handleTouch {
    NSNumber *number = [NSNumber numberWithBool:handleTouch];
    objc_setAssociatedObject(self, kKeyHandleTouch, number, OBJC_ASSOCIATION_RETAIN);
}

- (BOOL)handleTouch {
    NSNumber *number = objc_getAssociatedObject(self, kKeyHandleTouch);
    return [number boolValue];
}

@end

UnityView+Touchable.h

#import <Foundation/Foundation.h>
#import "UnityView.h"

@interface UnityView (Touchable)

@property (readwrite) BOOL handleTouch;

@end