simple_navigation_view.py

navtest_mainview.pyui

[
  {
    "class" : "View",
    "attributes" : {
      "name" : "Main View",
      "background_color" : "RGBA(1.000000,1.000000,1.000000,1.000000)",
      "tint_color" : "RGBA(0.000000,0.478000,1.000000,1.000000)",
      "enabled" : true,
      "border_color" : "RGBA(0.000000,0.000000,0.000000,1.000000)",
      "flex" : ""
    },
    "frame" : "{{0, 0}, {600, 400}}",
    "selected" : false,
    "nodes" : [
      {
        "class" : "Label",
        "attributes" : {
          "font_size" : 18,
          "text" : "main view",
          "font_name" : "<System>",
          "name" : "label1",
          "class" : "Label",
          "alignment" : "left",
          "frame" : "{{45, 104}, {150, 32}}",
          "uuid" : "0B1C41A7-4126-448B-9280-0FC8579D0774"
        },
        "frame" : "{{224, 166}, {150, 55}}",
        "selected" : false,
        "nodes" : [

        ]
      },
      {
        "class" : "Button",
        "attributes" : {
          "font_size" : 15,
          "uuid" : "1BB1CA87-874C-408E-8536-7E328159B638",
          "name" : "button1",
          "action" : "button_action",
          "class" : "Button",
          "frame" : "{{260, 184}, {80, 32}}",
          "title" : "print_view_name"
        },
        "frame" : "{{218, 256}, {156, 48}}",
        "selected" : false,
        "nodes" : [

        ]
      }
    ]
  }
]

navtest_subview1.pyui

[
  {
    "class" : "View",
    "attributes" : {
      "name" : "Subview1",
      "background_color" : "RGBA(1.000000,1.000000,1.000000,1.000000)",
      "tint_color" : "RGBA(0.000000,0.478000,1.000000,1.000000)",
      "enabled" : true,
      "border_color" : "RGBA(0.000000,0.000000,0.000000,1.000000)",
      "flex" : ""
    },
    "frame" : "{{0, 0}, {600, 400}}",
    "selected" : false,
    "nodes" : [
      {
        "class" : "Label",
        "attributes" : {
          "font_size" : 18,
          "text" : "Subview 1",
          "font_name" : "<System>",
          "name" : "label1",
          "class" : "Label",
          "alignment" : "left",
          "frame" : "{{45, 104}, {150, 32}}",
          "uuid" : "5ACF2819-96A2-4C54-89E4-D7E8963A15E1"
        },
        "frame" : "{{222, 171}, {150, 32}}",
        "selected" : false,
        "nodes" : [

        ]
      },
      {
        "class" : "Button",
        "attributes" : {
          "font_size" : 15,
          "uuid" : "96E13161-8A5B-4430-956B-A02665598A82",
          "name" : "button1",
          "action" : "button_action",
          "class" : "Button",
          "frame" : "{{260, 184}, {80, 32}}",
          "title" : "Button"
        },
        "frame" : "{{222, 263}, {144, 52}}",
        "selected" : false,
        "nodes" : [

        ]
      }
    ]
  }
]

navtest_subview2.pyui

[
  {
    "class" : "View",
    "attributes" : {
      "name" : "Subview2",
      "background_color" : "RGBA(1.000000,1.000000,1.000000,1.000000)",
      "tint_color" : "RGBA(0.000000,0.478000,1.000000,1.000000)",
      "enabled" : true,
      "border_color" : "RGBA(0.000000,0.000000,0.000000,1.000000)",
      "flex" : ""
    },
    "frame" : "{{0, 0}, {600, 400}}",
    "selected" : false,
    "nodes" : [
      {
        "class" : "Label",
        "attributes" : {
          "font_size" : 18,
          "text" : "Subview 2",
          "font_name" : "<System>",
          "name" : "label1",
          "class" : "Label",
          "alignment" : "left",
          "frame" : "{{45, 104}, {150, 32}}",
          "uuid" : "590803AC-D7E1-4D8A-B5B7-E7F2CAFDD034"
        },
        "frame" : "{{224, 174}, {150, 58}}",
        "selected" : false,
        "nodes" : [

        ]
      },
      {
        "class" : "Button",
        "attributes" : {
          "font_size" : 15,
          "title" : "Button",
          "name" : "button1",
          "action" : "button_action",
          "class" : "Button",
          "frame" : "{{260, 184}, {80, 32}}",
          "uuid" : "D957F725-49FD-4AB3-AF2D-C9B3693A8E79"
        },
        "frame" : "{{224, 284}, {150, 74}}",
        "selected" : true,
        "nodes" : [

        ]
      }
    ]
  }
]

simple_navigation_view.py

import ui
from functools import partial

def button_action(sender):
    print(sender.superview.name)


class SimpleNavigationView(ui.View):
    def add_close_buttonitem(self, v):
        close = ui.ButtonItem()
        close.image = ui.Image.named('ionicons-close-24')
        close.action = self.bt_close
        v.left_button_items = [close]
    
    def add_right_buttonitem(self, v, action):
        right = ui.ButtonItem()
        right.image = ui.Image.named('ionicons-arrow-right-b-24')
        right.action = action
        v.right_button_items = [right]  
        
    def bt_close(self, sender):
        self.nav_view.superview.close()
        
    def bt_subview(self, i, sender):
        subview = ui.load_view(self.subviews_pyui[i])
        if i < (len(self.subviews_pyui)-1):
            self.add_right_buttonitem(subview, self.bt_subviews[i+1])
        self.nav_view.push_view(subview)
        
    def make_bt_subview(self):
        for i in range(len(self.subviews_pyui)-1, 0, -1):
            self.bt_subviews[i] = partial(self.bt_subview, i)
                
    def __init__(self, w=600, h=400, subviews_pyui=None):
        super().__init__(frame=(0,0,w,h))
        self.subviews_pyui = subviews_pyui
        self.bt_subviews = [None]*len(self.subviews_pyui)
        if len(self.subviews_pyui) > 1:
            self.main_view = ui.load_view(self.subviews_pyui[0])
            self.make_bt_subview()
            self.add_close_buttonitem(self.main_view)
            self.add_right_buttonitem(self.main_view, self.bt_subviews[1])
            self.nav_view = ui.NavigationView(self.main_view)
            self.nav_view.width = w
            self.nav_view.height = h
            self.add_subview(self.nav_view)
            

SimpleNavigationView(w=600, h=400,
        subviews_pyui=('navtest_mainview', 'navtest_subview1', 'navtest_subview2')
            ).present('sheet',   hide_title_bar=True)