使用Stack布局创建图文重叠的效果

image_and_text_in_stack.dart

new Stack(
  children: <Widget>[
    new Positioned.fill(
      child: new FadeInImage(
        placeholder: new AssetImage('placeholder.png'),
        image: new CachedNetworkImageProvider(photos[int].url),
        fit: BoxFit.contain,
        alignment: Alignment.center,
        fadeInDuration: new Duration(milliseconds: 200),
        fadeInCurve: Curves.linear,
      ),
    ),
    new Positioned(
      top: 10.0,
      left: 10.0,
      child: new Container(
        child: new Text(photos[int].title)
      ),
    ),
  ],
)