Constructor as follows: the MainWindow: : MainWindow (QWidget * parent) : QMainWindow (parent), UI (new UI: : MainWindow) {UI - & gt; SetupUi (this); This - & gt; SetWindowFlags (Qt: : FramelessWindowHint); This - & gt; SetWindowFlags (Qt: : Windows); This - & gt; ShowFullScreen (); Taishiback=new QWidget. Taishiback - & gt; ,0,800,600 setGeometry (0);//taishiback - & gt; SetAutoFillBackground (true);//UI - & gt; VerticalLayout - & gt; AddWidget (taishi);//taishiback - & gt; Show ();//taishiback - & gt; SetParent (this); Lab1=new QLabel; Lab1 - & gt; SetGeometry (0110 0,50,100); Lab1 - & gt; SetText (" 1234555 "); Lab1 - & gt; SetParent (this); } to see many routine use layout managers, don't use cannot be displayed? And where there is a problem? If this does not add the new controls, so should use this member function?

CodePudding user response:

LZ you this writing is not an error? Right should write QWidget so * taishiback=new QWidget (this);

CodePudding user response:

QMainWindow setCentralWidget (), please set control center

CodePudding user response:

//taishiback - & gt; Show (); Why do you want to comment out? Encountered this problem before, and the show will be displayed, commented how display have a look at the UI files are generated that ui_XXXXX. H file, where the function is called the show

CodePudding user response:

Don't come out, and finally in the interface directly pulled a, but this method sets the background color, and still on the road is not easy

CodePudding user response:

Add the following code QWidget * taishiback=new QWidget; Taishiback - & gt; SetGeometry (420370320-30); QPalette the palette. The palette. SetBrush (QPalette: : Background, QBrush (Qt: : red)); Taishiback - & gt; SetPalette (palette); Taishiback - & gt; SetEnabled (true); Taishiback - & gt; SetAutoFillBackground (true); Taishiback - & gt; SetParent (this); Display a red rectangular patten form the lower right corner

CodePudding user response:

Don't add the layout editor are easy to be blocked by other controls, naturally can not see

CodePudding user response:

SetParent (centerWidget ());