Kivy Gridlayout error: have no cols or rows set, layout is not triggered

Question

我正在尝试创建一个基本的 Kivy 应用程序，它在 GridLayout 中有 4 个标签。这是我的 Python 代码：

from kivy.lang import Builder
from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label

class MyLayout(GridLayout):

    def __init__(self, **kwargs):
        Builder.load_file("mylayout.kv")
        super(MyLayout, self).__init__(**kwargs)


class MyApp(App):

    def build(self):
        return MyLayout()


if __name__ == '__main__':
    MyApp().run()

这是我的 mylayout.kv 文件：

<MyLayout>:
    GridLayout:
        cols: 2
        rows: 4

        Label:
            text: "Hello"
        Label:
            text: "Hello2"
        Label
            text: "Hello3"
        Label
            text: "Hello4"

当我运行程序时，这出现在日志中：

[INFO              ] [Logger      ] Record log in C:\Users\tjordan\.kivy\logs\kivy_15-09-22_56.txt
[INFO              ] [Kivy        ] v1.9.0
[INFO              ] [Python      ] v2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)]
[INFO              ] [Factory     ] 173 symbols loaded
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_gif, img_sdl2 (img_pil, img_ffpyplayer ignored)
[INFO              ] [Text        ] Provider: sdl2
[INFO              ] [OSC         ] using <thread> for socket
[INFO              ] [Window      ] Provider: sdl2
[INFO              ] [GL          ] GLEW initialization succeeded
[INFO              ] [GL          ] OpenGL version <3.1.0 - Build 9.17.10.4229>
[INFO              ] [GL          ] OpenGL vendor <Intel>
[INFO              ] [GL          ] OpenGL renderer <Intel(R) HD Graphics>
[INFO              ] [GL          ] OpenGL parsed version: 3, 1
[INFO              ] [GL          ] Shading version <1.40 - Intel Build 9.17.10.4229>
[INFO              ] [GL          ] Texture max size <8192>
[INFO              ] [GL          ] Texture max units <16>
[INFO              ] [Shader      ] fragment shader: <No errors.>
[INFO              ] [Shader      ] vertex shader: <No errors.>
[INFO              ] [Shader      ] program: <No errors.>
[INFO              ] [Window      ] auto add sdl2 input provider
libpng warning: iCCP: known incorrect sRGB profile
[INFO              ] [Window      ] virtual keyboard not allowed, single mode, not docked
[INFO              ] [Base        ] Start application main loop
[INFO              ] [GL          ] NPOT texture support is available
[WARNING           ] <__main__.MyLayout object at 0x02D0F260> have no cols or rows set, layout is not triggered.
[INFO              ] [Base        ] Leaving application in progress...

我是 Kivy 的新手，所以我只是想掌握一些基础知识。我已尝试将 Builder 移出 init，但仍然遇到相同的 "have no cols or rows set, layout is not triggered" 错误。当程序运行s 时，它会将所有标签放在左下角的彼此之上。

Answer 1

您的 kv 规则将 GridLayout 放置在 GridLayout 中，并且只为第二个设置行和列。只需删除第二层，以便为第一个 GridLayout（您的 MyLayout）设置列，并将标签直接添加到此。

Kivy Gridlayout error: have no cols or rows set, layout is not triggered

Kivy Gridlayout error: have no cols or rows set, layout is not triggered

python

kivy