placeholderBuilder property
自定义占位小部件
例子 placeholderBuilder: (size) { return SizedBox( width: size.width, height: size.height, child: Center( child: Column( mainAxisAlignment: MainAxisAlignment.center, children: Icon(Icons.add), SizedBox(height: 2), Text('添加图片'), , ), )); },
Implementation
final PlaceholderBuilder? placeholderBuilder;