- (void)setupWebView {
    if (!self.uiWebView) {
        self.uiWebView = [[[UIWebView alloc] init] autorelease];
        self.uiWebView.delegate = self;
    }
    if (!self.uiWebView.superview) {
        auto view = cocos2d::Director::getInstance()->getOpenGLView();
        auto eaglview = (CCEAGLView *) view->getEAGLView();
        [eaglview addSubview:self.uiWebView];
    }
}

- (void)setupWebView {
    if (!self.uiWebView) {
        self.uiWebView = [[[UIWebView alloc] init] autorelease];
        self.uiWebView.delegate = self;
        
        // 15/7/17 add
        [self.uiWebView setOpaque:NO];
        [self.uiWebView setBackgroundColor:[UIColor clearColor]];
    }
    if (!self.uiWebView.superview) {
        auto view = cocos2d::Director::getInstance()->getOpenGLView();
        auto eaglview = (CCEAGLView *) view->getEAGLView();
        [eaglview addSubview:self.uiWebView];
    }
}

style=""

/cocos2d/cocos/ui/UIWebViewImpl-ios.mm

Android Cocos2dxWebView.Java

public Cocos2dxWebView(Context context, int viewTag) {

this.setBackgroundColor(0); // 设置背景色

//this.getBackground().setAlpha(0); // 设置填充透明度 范围：0-255

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