Flutter GestureDetector同时用缩放平移报错，求经纬度调整方案

Flutter的GestureDetector报错核心原因是缩放手势本身已包含平移功能，同时注册平移、缩放两种手势识别器属于冗余配置，只需保留onScaleUpdate回调，把平移逻辑整合进去即可，无需额外使用onPanUpdate。

修改后的代码直接将平移判断逻辑移入onScaleUpdate，利用回调参数details.delta获取平移偏移量，同时保留你原有的缩放逻辑：

Positioned(
  top: 250,
  right: 10,
  child: GestureDetector(
    onScaleUpdate: (details) {
      setState(() {
        // 处理缩放逻辑
        double scaleFactor = details.scale;
        if (scaleFactor > 1) {
          topL[chosenPlate]!.latitude += tolerance;
          botL[chosenPlate]!.latitude -= tolerance;
          botR[chosenPlate]!.latitude -= tolerance;
          topL[chosenPlate]!.longitude -= tolerance;
          botL[chosenPlate]!.longitude -= tolerance;
          botR[chosenPlate]!.longitude += tolerance;
        } else if (scaleFactor < 1) {
          topL[chosenPlate]!.latitude -= tolerance;
          topL[chosenPlate]!.longitude -= tolerance;
          botL[chosenPlate]!.latitude += tolerance;
          botL[chosenPlate]!.longitude -= tolerance;
          botR[chosenPlate]!.latitude += tolerance;
          botR[chosenPlate]!.longitude += tolerance;
        }

        // 处理平移逻辑
        if (details.delta.dx < 0) {
          topL[chosenPlate]!.longitude -= tolerance;
          botL[chosenPlate]!.longitude -= tolerance;
          botR[chosenPlate]!.longitude -= tolerance;
        } else if (details.delta.dx > 0) {
          topL[chosenPlate]!.longitude += tolerance;
          botL[chosenPlate]!.longitude += tolerance;
          botR[chosenPlate]!.longitude += tolerance;
        }

        if (details.delta.dy < 0) {
          topL[chosenPlate]!.latitude += tolerance;
          botL[chosenPlate]!.latitude += tolerance;
          botR[chosenPlate]!.latitude += tolerance;
        } else if (details.delta.dy > 0) {
          topL[chosenPlate]!.latitude -= tolerance;
          botL[chosenPlate]!.latitude -= tolerance;
          botR[chosenPlate]!.latitude -= tolerance;
        }
      });
    },
    child: Container(
      height: 20.h,
      width: 30.w,
      color: Color.fromARGB(255, 233, 176, 176),
    ),
  ),
)

额外说明：

• 将分散的setState合并到同一个回调中，避免多次触发UI更新
• 缩放参数scaleFactor为相对比例，你的固定tolerance增减逻辑可直接沿用
• 平移参数delta与原onPanUpdate的偏移量逻辑完全一致，无需额外转换

内容的提问来源于stack exchange，提问作者Pannam