directly support embed.FS and fs.FS on view engines

_examples/view/embedding-templates-into-app-bindata/main.go

@@ -0,0 +1,52 @@
+package main
+
+import "github.com/kataras/iris/v12"
+
+func main() {
+	app := iris.New()
+
+	// $ go install github.com/go-bindata/go-bindata/v3/go-bindata@latest
+	// $ go-bindata -fs -prefix "templates" ./templates/...
+	// $ go run .
+	// html files are not used, you can delete the folder and run the example.
+	tmpl := iris.HTML(AssetFile(), ".html")
+	tmpl.Layout("layouts/layout.html")
+	tmpl.AddFunc("greet", func(s string) string {
+		return "Greetings " + s + "!"
+	})
+
+	app.RegisterView(tmpl)
+
+	app.Get("/", func(ctx iris.Context) {
+		if err := ctx.View("page1.html"); err != nil {
+			ctx.StatusCode(iris.StatusInternalServerError)
+			ctx.Writef(err.Error())
+		}
+	})
+
+	// remove the layout for a specific route
+	app.Get("/nolayout", func(ctx iris.Context) {
+		ctx.ViewLayout(iris.NoLayout)
+		if err := ctx.View("page1.html"); err != nil {
+			ctx.StatusCode(iris.StatusInternalServerError)
+			ctx.Writef(err.Error())
+		}
+	})
+
+	// set a layout for a party, .Layout should be BEFORE any Get or other Handle party's method
+	my := app.Party("/my").Layout("layouts/mylayout.html")
+	{ // both of these will use the layouts/mylayout.html as their layout.
+		my.Get("/", func(ctx iris.Context) {
+			ctx.View("page1.html")
+		})
+		my.Get("/other", func(ctx iris.Context) {
+			ctx.View("page1.html")
+		})
+	}
+
+	// http://localhost:8080
+	// http://localhost:8080/nolayout
+	// http://localhost:8080/my
+	// http://localhost:8080/my/other
+	app.Listen(":8080")
+}