garfeng

QLayout: Attempting to add QLayout "" to MainWindow "", which already has a layout

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widget_main_body = new QWidget(this);

setCentralWidget(widget_main_body);

hbox=new QHBoxLayout(this);

widget_main_body->setLayout(hbox);

以上会报：QLayout: Attempting to add QLayout "" to MainWindow "", which already has a layout

的错误。

因为new QHBoxLayout(this)的this参数，会自动把该layout设置给this。

所以处理办法是：

widget_main_body = new QWidget(this);

setCentralWidget(widget_main_body);

hbox=new QHBoxLayout; //这里不传参

widget_main_body->setLayout(hbox);