Kivy按钮点击写入CSV异常：获部件位置布尔值而非目标数据

Hey there, let's break down what's going wrong with your code and fix it step by step. The core issue is that your data flow between the collision check, button press, and CSV operations is broken—plus there are a few syntax/logic mistakes that are causing those boolean values to show up instead of your intended data.

1. Fix the Data Flow Between Count() and DataBase #

Right now, your Count() method calculates a collision count but doesn't store it anywhere accessible to the DataBase class. Let's add an instance variable to PutOnShelfScreen1 to track this count so we can pass it to DataBase later.

Update the PutOnShelfScreen1 class:

class PutOnShelfScreen1(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.collision_count = 0  # Store collision count as an instance variable

    def Count(self, Transportation, Furniture, Tools, armchair):
        # No need to reassign parameters to self.ids—you already passed them!
        armchair = self.ids.my_image2.parent
        if armchair.collide_widget(Furniture):
            self.collision_count += 1
            print(f"Collision detected! Current count: {self.collision_count}")

2. Fix the DataBase Class and CSV Operations #

Your DataBase class has several critical issues:

• data.append(i) returns None (it modifies the list in-place), so assigning it to self.data breaks your data reference.
• You were writing to a Chinese-named CSV file but reading from results.csv (mismatched filenames).
• You never called the Table() method to actually run the CSV write/read logic.

Here's the corrected DataBase class:

class DataBase():
    def __init__(self, count_value, **kwargs):
        super().__init__(**kwargs)
        self.count_value = count_value
        self.database_file = 'results.csv'  # Use a consistent filename

    def Table(self):
        global data
        data.append(str(self.count_value))  # Convert count to string for CSV compatibility

        # Write to CSV
        with open(self.database_file, 'w', newline='') as database:
            wr = csv.writer(database, delimiter=',', quoting=csv.QUOTE_MINIMAL)
            wr.writerow(['Column1', 'Column2', 'Result'])
            wr.writerow(data)
        
        # Read and print CSV content to verify
        print("\nCSV Verification:")
        with open(self.database_file, 'r') as database:
            reader = csv.reader(database)
            for row in reader:
                print(row)

3. Fix the Button on_press Binding #

Your Next button was calling root.DataBase(database) which is invalid—database isn't defined, and you need to properly pass the collision count and trigger the CSV operations.

Update the button in your KV string:

Button:
    id: Next
    pos_hint: {'x': 0.8, 'y': 0.9}
    size_hint: .2, .1
    background_color: [63/255, 191/255, 63/255, 0.3]  # Kivy uses 0-1 range for colors!
    text: '>'
    on_press: root.save_to_csv()

Add this method to PutOnShelfScreen1 to handle the button press:

class PutOnShelfScreen1(Screen):
    # ... existing __init__ and Count() methods ...
    def save_to_csv(self):
        # Create DataBase instance with our collision count and run operations
        db = DataBase(self.collision_count)
        db.Table()

4. Bonus Fix: Kivy Color Values #

Kivy expects color values in the 0-1 range (not 0-255). Your background_color properties like [63, 191, 63, 0.3] should be scaled to [63/255, 191/255, 63/255, 0.3] to display correctly.

Full Corrected Code #

from kivy.app import App
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
from kivy.properties import ObjectProperty
import csv

Builder.load_string('''
<Sample@Image>
    size: self.size
    allow_stretch: False
    keep_ratio: False
    do_rotation: False
<PutOnShelfScreen1>
    canvas:
        Rectangle:
            source: 'BackForGame113.png'
            size: self.size
            pos: self.pos
    BoxLayout:
        orientation: 'horizontal'
        spacing: 30
        padding: [10, 150, 10, 10]
        Button:
            id: Tools
            background_color: [63/255, 191/255, 63/255, 0.3]
            text: ''
        Button:
            id: Transportation
            background_color: [63/255, 191/255, 63/255, 0.3]
            text: ''
        Button:
            id: Furniture
            background_color: [63/255, 191/255, 63/255, 0.3]
            text: ''
    FloatLayout:
        Button:
            id: Next
            pos_hint: {'x': 0.8, 'y': 0.9}
            size_hint: .2, .1
            background_color: [63/255, 191/255, 63/255, 0.3]
            text: '>'
            on_press: root.save_to_csv()
        StencilView:
            id: armchair
            ScatterPlane:
                pos: 500, 500
                size: my_image2.size
                Image:
                    id: my_image2
                    source: 'path\\image.png'
                    on_touch_up: root.Count(Furniture, Tools, Transportation, armchair)
''')

data = ['Bla', '6']

class PutOnShelfScreen1(Screen):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.collision_count = 0

    def Count(self, Transportation, Furniture, Tools, armchair):
        armchair = self.ids.my_image2.parent
        if armchair.collide_widget(Furniture):
            self.collision_count += 1
            print(f"Collision detected! Current count: {self.collision_count}")

    def save_to_csv(self):
        db = DataBase(self.collision_count)
        db.Table()

class DataBase():
    def __init__(self, count_value, **kwargs):
        super().__init__(**kwargs)
        self.count_value = count_value
        self.database_file = 'results.csv'

    def Table(self):
        global data
        data.append(str(self.count_value))

        with open(self.database_file, 'w', newline='') as database:
            wr = csv.writer(database, delimiter=',', quoting=csv.QUOTE_MINIMAL)
            wr.writerow(['Column1', 'Column2', 'Result'])
            wr.writerow(data)
        
        print("\nCSV Verification:")
        with open(self.database_file, 'r') as database:
            reader = csv.reader(database)
            for row in reader:
                print(row)

sm = ScreenManager()
sm.add_widget(PutOnShelfScreen1(name='class'))

class SampleApp(App):
    def build(self):
        return sm

if __name__ == "__main__":
    SampleApp().run()

How This Works Now #

1. When you drag the armchair and release (on_touch_up), Count() checks for a collision with the Furniture button and increments self.collision_count if detected.
2. Clicking the Next button triggers save_to_csv(), which creates a DataBase instance with the current collision count.
3. DataBase.Table() updates your data list, writes it to results.csv, then reads and prints the CSV content to confirm the write was successful.

You’ll now see your intended data in the CSV instead of those boolean values!

内容的提问来源于stack exchange，提问作者K.Kate