我的观点很简单：

import SwiftUI

struct CategoryElementView: View {
    @Binding var selectedCategory: String?
    private let category: String
    private let isSelectable: Bool
    
    private var isSelected: Bool {
        !isSelectable || category == selectedCategory
    }

    init(category: String, selectedCategory: Binding<String?>) {
        self.category = category
        self.isSelectable = true
        self._selectedCategory = selectedCategory
    }
    
    init(category: String) {
        self.category = category
        self.isSelectable = false
        self._selectedCategory = category 
        // ❌ Cannot assign value of type 'String' to type 'Binding<String?>'
    }
}

我的目的是什么？我需要使用相同的视图用于2种模式：选择它（selectable == true），只显示它（selectable == false）。如果没有选择，就不需要从外部绑定了。怎么做呢？Nil也会在这里产生错误。