Child thread executes custom signal and crashes when updating interface content

[zzh151223]

Describe the bug
JVM crashes when child thread executes custom signal .emit() to update content

Expected behavior
Request the web page in the child thread and return the data, output the data to the form

Screenshots

Additional context

        new QThread(){
            @Override
            public void run(){
                //Request a web page and get the return value
                .......
                // customsignal.emit()
                customsignal.emit()
            }
        }.start();

================================================
        //customsignal execute
        tablewidget.setItem(0,0, QTableWidgetItem(The value returned by the page))  // program crashes here

[zzh151223]

new QThread(){
    @Override
    public void run(){
    //Request a web page and get the return value
    .......
    tablewidget.setItem(0,0, QTableWidgetItem("test"))  // program crashes here
}
}.start();

This will also give an error

[omix]

QTTablewidget.setItem() is thread affine, i.e. you cannot use it outside the main thread.
The method throws an QThreadAffinityException. The application crashes because QThread.run() must not throw any exceptions.

QThread.create(()->{
    tablewidget.setItem(0,0, QTableWidgetItem("test"));
});

Will not crash but print the thrown exception.

Avoid QThreadAffinityException by placing the setItem operation in main thread.