我在从另一个类更新kivy Label Text运行时时遇到了一些麻烦。 我已尝试过类似问题的所有可能解决方案,但无法获得结果。 在我的应用程序中,我有一个主类和另一个弹出类。我想从弹出类更新主类窗口小部件的文本标签。
main.kv文件
<JKmain>:
the_time: _id_lbl_time
AnchorLayout:
anchor_x: 'left'
anchor_y: 'top'
BoxLayout:
orientation: 'vertical'
id: _tool_box
size_hint: None,0.75
width: 300
Label:
id: _id_lbl_time
text: "Total Layers : "
AnchorLayout:
anchor_x: 'right'
anchor_y: 'top'
GridLayout:
rows:2
...
...
BoxLayout:
orientation: 'horizontal'
Button:
on_release: app.root.current = "main"
text: "SELECT"
size_hint: 1,0.2
background_color: (1.0, 1.0, 0.0, 1.0)
on_release: root.popup_func(self)
Button:
text: "START"
size_hint: 1,0.2
background_color: (1.0, 0.0, 1.0, 1.0)
on_release: root.change_text(100)
Button:
text: "EXIT"
size_hint: 1,0.2
background_color: (1.0, 0.0, 1.0, 1.0)
on_release: root.exit_app(self)
<ConfirmPopup>:
BoxLayout:
orientation: 'vertical'
FileChooserIconView:
id: filechooser
filters: ['*.zip']
GridLayout:
cols: 2
size_hint: 1,0.2
Button:
text: 'OK'
on_release: root.dispatch('on_answer',filechooser.selection)
size_hint: 1,0.2
Button:
text: 'Cancel'
on_release: root.dispatch('on_answer', 'Cancel')
size_hint: 1,0.2
ConfirmPopup类:
class ConfirmPopup(BoxLayout):
def __init__(self,**kwargs):
self.register_event_type('on_answer')
super(ConfirmPopup,self).__init__(**kwargs)
...
...
self.total_images=0
def on_answer(self, filename):
...
...
...
if not isdir_empty == "":
folders = ([name for name in os.listdir(self.project_path)])
targets = []
for i in folders:
if i.endswith('.png'):
targets.append(i)
self.total_images = len(targets)
jk = JKMain()
jk.change_text(self.total_images)
主类:
class JKMain(AnchorLayout):
def __init__(self, **kwargs):
super(JKMain, self).__init__(**kwargs)
def change_text(self,layers):
self.the_time.text = "Total Layers : " + str(layers)
print "Total Layers = " + str(layers)
def popup_func(self, instance):
content = ConfirmPopup()
content.bind(on_answer=self._on_answer)
self.popup = Popup(title="Select .zip file",
content=content,
size_hint=(None, None),
size=(500,500),
auto_dismiss= False)
self.popup.open()
def _on_answer(self, instance, answer):
self.popup.dismiss()
我可以使用 change_text
功能更新文字。从 ConfirmPopup 类开始,我创建 JKMain 的实例并访问 change_text
函数来更改Label,但它无法正常工作
答案 0 :(得分:0)
它无法正常工作,因为通过创建 JKMain 的另一个实例,现在您有两个 JKMain 实例,并且您没有访问第一个实例,即根。 / p>
作为解决方案正常运行的演示, self.total_images 在方法 on_answer 中设置为 8 ,然后再调用方法 change_text
<JKmain>:
...
on_release: root.popup_func()
...
<ConfirmPopup>:
...
on_release: root.dispatch('on_answer', filechooser.selection, app.root)
class ConfirmPopup(BoxLayout):
...
def on_answer(self, filename, JKMain):
self.total_images = 8
print("JKMain=", JKMain)
JKMain.change_text(self.total_images)
class JKMain(AnchorLayout):
...
def popup_func(self):
...
def _on_answer(self, instance, answer, obj):
self.popup.dismiss()
from kivy.app import App
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.popup import Popup
class ConfirmPopup(BoxLayout):
def __init__(self, **kwargs):
self.register_event_type('on_answer')
super(ConfirmPopup, self).__init__(**kwargs)
self.total_images = 0
def on_answer(self, filename, JKMain):
self.total_images = 8
print("JKMain=", JKMain)
JKMain.change_text(self.total_images)
class JKMain(AnchorLayout):
def __init__(self, **kwargs):
super(JKMain, self).__init__(**kwargs)
def change_text(self, layers):
self.the_time.text = "Total Layers : " + str(layers)
print("Total Layers = " + str(layers))
def popup_func(self):
content = ConfirmPopup()
content.bind(on_answer=self._on_answer)
self.popup = Popup(title="Select .zip file",
content=content,
size_hint=(None, None),
size=(500, 500),
auto_dismiss=False)
self.popup.open()
def _on_answer(self, instance, answer, obj):
self.popup.dismiss()
class Main(App):
def build(self):
return JKMain()
if __name__ == "__main__":
Main().run()
#: kivy 1.10.0
<JKmain>:
the_time: _id_lbl_time
AnchorLayout:
anchor_x: 'left'
anchor_y: 'top'
BoxLayout:
orientation: 'vertical'
id: _tool_box
size_hint: None,0.75
width: 300
Label:
id: _id_lbl_time
text: "Total Layers : "
AnchorLayout:
anchor_x: 'right'
anchor_y: 'top'
GridLayout:
rows:2
BoxLayout:
orientation: 'horizontal'
Button:
on_release: app.root.current = "main"
text: "SELECT"
size_hint: 1,0.2
background_color: (1.0, 1.0, 0.0, 1.0)
on_release: root.popup_func()
Button:
text: "START"
size_hint: 1,0.2
background_color: (1.0, 0.0, 1.0, 1.0)
on_release: root.change_text(100)
Button:
text: "EXIT"
size_hint: 1,0.2
background_color: (1.0, 0.0, 1.0, 1.0)
on_release: root.exit_app(self)
<ConfirmPopup>:
BoxLayout:
orientation: 'vertical'
FileChooserIconView:
id: filechooser
filters: ['*.zip']
GridLayout:
cols: 2
size_hint: 1,0.2
Button:
text: 'OK'
on_release: root.dispatch('on_answer', filechooser.selection, app.root)
size_hint: 1,0.2
Button:
text: 'Cancel'
on_release: root.dispatch('on_answer', 'Cancel')
size_hint: 1,0.2