Kivy Python动态按钮关联对应Label实现度分秒角度调整的问题

应用内某屏幕用于展示度分秒格式的角度值，这些值是进入屏幕时创建的MDLabel组件，数值取自用户在上一屏幕MDTextField中输入的内容。角度的数量由第一屏幕用户输入的点数量决定：若有5个点则生成5组角度，每组对应独立的度分秒输入值。每个角度为包含度、分、秒3个值的列表，所有角度存储在名为angles的二维列表中以便后续计算。

需要实现用户点击+/-按钮调整角度的功能，每点击一次将对应角度的秒数增减1。当前无法将按钮与对应角度关联，比如点击第二个角度的+按钮，仅会给第二个角度的秒数加1，不清楚如何编写对应的plus()/minus()方法实现该逻辑。

首先调整on_enter方法中的组件存储逻辑和按钮绑定逻辑，通过默认参数传递角度索引解决闭包晚绑定问题：

class AngleAdjustment(Screen):
    def on_enter(self, *args):
        self.adj_angles_widgets = []
        self.minus_buttons = []
        self.plus_buttons = []
        angle_number = 0
        for angle in angles:
            angle_number += 1
            self.angle_to_adjust_title = MDLabel(text="Angle " + str(angle_number), font_size=20, halign="center")
            self.angle_adjustment_gridlayout = MDGridLayout(cols=5, spacing="10dp", padding="10dp", adaptive_height=True)
            self.minus_button = MDIconButton(icon="minus-circle", user_font_size="40sp")
            self.degrees_to_adjust = MDLabel(text=str(angle[0]), halign="center")
            self.minutes_to_adjust = MDLabel(text=str(angle[1]), halign="center")
            self.seconds_to_adjust = MDLabel(text=str(angle[2]), halign="center")
            self.plus_button = MDIconButton(icon="plus-circle", user_font_size="40sp")

            # 存储Label组件引用而非固定数值，方便后续更新界面
            self.adj_angle_widgets = [self.degrees_to_adjust,
                                      self.minutes_to_adjust,
                                      self.seconds_to_adjust]
            self.adj_angles_widgets.append(self.adj_angle_widgets)

            self.minus_buttons.append(self.minus_button)
            self.plus_buttons.append(self.plus_button)

            self.angle_adjustment_gridlayout.add_widget(self.minus_button)
            self.angle_adjustment_gridlayout.add_widget(self.degrees_to_adjust)
            self.angle_adjustment_gridlayout.add_widget(self.minutes_to_adjust)
            self.angle_adjustment_gridlayout.add_widget(self.seconds_to_adjust)
            self.angle_adjustment_gridlayout.add_widget(self.plus_button)

            self.ids.angle_adjustment.add_widget(self.angle_to_adjust_title)
            self.ids.angle_adjustment.add_widget(self.angle_adjustment_gridlayout)

            # 绑定按钮时传入当前角度的索引，用默认参数固定当前循环的索引值
            self.minus_button.bind(on_press=lambda btn, idx=angle_number-1: self.minus(idx))
            self.plus_button.bind(on_press=lambda btn, idx=angle_number-1: self.plus(idx))

在AngleAdjustment类中添加以下两个方法，包含度分秒的进位/借位逻辑，同时同步更新全局angles数组：

def plus(self, index):
    deg_label, min_label, sec_label = self.adj_angles_widgets[index]
    deg = int(deg_label.text)
    minute = int(min_label.text)
    sec = int(sec_label.text)
    
    sec += 1
    # 处理进位逻辑
    if sec >= 60:
        sec -= 60
        minute += 1
        if minute >= 60:
            minute -= 60
            deg += 1
    
    # 更新界面显示
    deg_label.text = str(deg)
    min_label.text = str(minute)
    sec_label.text = str(sec)
    # 同步更新全局角度数组
    angles[index] = [deg, minute, sec]

def minus(self, index):
    deg_label, min_label, sec_label = self.adj_angles_widgets[index]
    deg = int(deg_label.text)
    minute = int(min_label.text)
    sec = int(sec_label.text)
    
    sec -= 1
    # 处理借位逻辑，角度为负时直接返回不修改
    if sec < 0:
        if minute <= 0 and deg <= 0:
            return
        sec += 60
        minute -= 1
        if minute < 0:
            if deg <= 0:
                return
            minute += 60
            deg -= 1
    
    # 更新界面显示
    deg_label.text = str(deg)
    min_label.text = str(minute)
    sec_label.text = str(sec)
    # 同步更新全局角度数组
    angles[index] = [deg, minute, sec]

内容的提问来源于stack exchange，提问作者Guy Mendel