Ability to register a view engine per group of routes or for the current a chain of handlers

Example at: https://github.com/kataras/iris/tree/master/_examples/view/context-view-engine

_examples/view/context-view-engine/main.go

@@ -0,0 +1,65 @@
+package main
+
+import "github.com/kataras/iris/v12"
+
+func main() {
+	app := iris.New()
+	// Register a root view engine, as usual,
+	// will be used to render files through Context.View method
+	// when no Party or Handler-specific view engine is available.
+	app.RegisterView(iris.Blocks("./views/public", ".html"))
+
+	// http://localhost:8080
+	app.Get("/", index)
+
+	// Register a view engine per group of routes.
+	adminGroup := app.Party("/admin")
+	adminGroup.RegisterView(iris.Blocks("./views/admin", ".html"))
+
+	// http://localhost:8080/admin
+	adminGroup.Get("/", admin)
+
+	// Register a view engine on-fly for the current chain of handlers.
+	views := iris.Blocks("./views/on-fly", ".html")
+	if err := views.Load(); err != nil {
+		app.Logger().Fatal(err)
+	}
+
+	// http://localhost:8080/on-fly
+	app.Get("/on-fly", setViews(views), onFly)
+
+	app.Listen(":8080")
+}
+
+func index(ctx iris.Context) {
+	data := iris.Map{
+		"Title": "Public Index Title",
+	}
+
+	ctx.ViewLayout("main")
+	ctx.View("index", data)
+}
+
+func admin(ctx iris.Context) {
+	data := iris.Map{
+		"Title": "Admin Panel",
+	}
+
+	ctx.ViewLayout("main")
+	ctx.View("index", data)
+}
+
+func setViews(views iris.ViewEngine) iris.Handler {
+	return func(ctx iris.Context) {
+		ctx.ViewEngine(views)
+		ctx.Next()
+	}
+}
+
+func onFly(ctx iris.Context) {
+	data := iris.Map{
+		"Message": "View engine changed through 'setViews' custom middleware.",
+	}
+
+	ctx.View("index", data)
+}