QGIS设置图层显隐和调整图层顺序

QGIS设置图层显隐，代码如下：

void setLayerVisiable(bool visible, const QString &layerName){
	QgsLayerTree *tree = QgsProject::instance()->layerTreeRoot();
	QList<QgsLayerTreeLayer *> layers = tree->findLayers();
	for (int i = 0; i < layers.size(); ++i) {
		QgsLayerTreeLayer *layer = layers[i];
		if (layer->name() == layerName) {
			layer->setItemVisibilityChecked(visible);
			setLayers(tree->checkedLayers());
			break;
		}
	}
}

QGIS调整图层顺序（图层上移），代码如下：

void moveLayerUp(const QString &layerName){
	QgsLayerTree *tree = QgsProject::instance()->layerTreeRoot();
	QList<QgsLayerTreeLayer *> layers = tree->findLayers();

	if (layers.length() < 2) { return; }
	if (layers[0]->name() == layerName) { return; }

	for (int i = 1; i < layers.size(); ++i){
		QgsLayerTreeLayer *node = layers[i];
		if (node->name() == layerName){
			QgsLayerTreeNode *clonedNode = node->clone();
			tree->insertChildNode(i - 1, clonedNode);
			tree->removeChildNode(node);
			setLayers(tree->checkedLayers());
			break;
		}
	}
}