flutter错误之 The method ‘>’ was called on null
如下方的报错,一般是ListView搭配Column或者Row出错了,看我下面的错误是Column ════════ Exception caught by rendering library ═════════════════════════════════ RenderBox was not laid out: RenderFlex#c1bcd relayoutBoundary=up1 NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE 'package:flutter/src/rendering/box.dart': Failed assertion:
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