How to change the font of a color bar?

Question

When using DensityPlot or similar, I want to change the font size of both frame labels and the color bar legend, but I can only get the frame labels to work.

Example:

DensityPlot[Sin[x] Sin[y], {x, -4, 4}, {y, -3, 3}, PlotLegends -> Automatic, 
BaseStyle -> {FontSize -> 30}]

Answer 1

labels = Directive[FontSize -> 24, Black, Italic];

DensityPlot[Sin[x] Sin[y], {x, -4, 4}, {y, -3, 3}, 
 PlotLegends -> BarLegend[{"LakeColors", {-1, 1}}, LabelStyle -> labels], 
 LabelStyle -> labels]

Answer 2

Here is an example

DensityPlot[Sin[x] Sin[y], {x, -4, 4}, {y, -3, 3}, 
    PlotLegends -> BarLegend["LakeColors", 
        LabelStyle -> {FontSize -> 30,     FontFamily -> "Helvetica"}], 
    BaseStyle -> {FontSize -> 30, FontFamily -> "Helvetica"}
]

More information in Mathematica 9 documentation.