这是和GestureDetector 中的一个属性有关。
GestureDetector( behavior: HitTestBehavior.opaque, )
/// How to behave during hit tests. enum HitTestBehavior { /// Targets that defer to their children receive events within their bounds /// only if one of their children is hit by the hit test. deferToChild, /// Opaque targets can be hit by hit tests, causing them to both receive /// events within their bounds and prevent targets visually behind them from /// also receiving events. opaque, /// Translucent targets both receive events within their bounds and permit /// targets visually behind them to also receive events. translucent, }加入以上代码即可