updateLineSpacing method Null safety

Future<bool> updateLineSpacing(
  1. int lineSpacing
)

更新文字行间距

iOS独有

Implementation

Future<bool> updateLineSpacing(int lineSpacing) async {
  if (!Platform.isIOS) {
    return false;
  }
  if (lineSpacing < 0) {
    return false;
  }
  bool ret = await BMFMapDispatcherFactory.instance.overlayDispatcher
      .updateTextMember(this.methodChannel,
          {'id': this.id, 'member': 'lineSpacing', 'value': lineSpacing});
  if (ret) {
    this.lineSpacing = lineSpacing;
  }
  return ret;
}