Reverse Layer Order.sketchplugin

// Reverse Layer Order

var doc = context.document,
    selection = context.selection;

function reverseLayerOrder(layers) {
  // Reverses the layer order
  for (var i=0; i < [layers count]; i++) {
    var first = [layers objectAtIndex:i]
    var next = [layers objectAtIndex:([layers count] - 1)]
    swapIndex(first, next)
  }
}

function swapIndex(layer1, layer2) {
  var a = layer1;
  var b = layer2;

  // check if both layers are in the same group
  var parent_a = null;
  var parent_b = null;

  try {
      parent_a = a.parentGroup();
      parent_b = b.parentGroup();
  } catch (error) {}

  if (parent_a == parent_b) {

      var parent = parent_a;

      // deselect all layers
      doc.currentPage().deselectAllLayers();

      // select b
      a.setIsSelected(true);

      var steps = Math.abs(parent.indexOfLayer(b) - parent.indexOfLayer(a));

      for (var i = 0; i < steps; i++) {
        [NSApp sendAction:'moveForward:' to:nil from:doc];
      }
  } else {
      doc.showMessage("Please select layers of the same group")
  }
}

var originalSelection = selection
reverseLayerOrder(selection)

// Restore selection
for (var j=0; j < [originalSelection count]; j++) {
  var layer = [originalSelection objectAtIndex:j]
  layer.setIsSelected(true)
}