placeholderBuilder property

PlaceholderBuilder? placeholderBuilder

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;