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当在页面间传递参数的时候会使用到 @Binding 声明,但是此时在 PreViews 中就会报错提示需要传递相应的参数进行初始化才能预览。
解决办法就是先声明 @State static 的静态参数,然后传递进去,举个例子:
import SwiftUI struct CategorySelectView: View { @Binding var categories: [String] @Binding var categorySelectedIndex: Int var body: some View { List { ForEach(categories, id: \.self) { category in Text(category) } } } } struct CategorySelectView_Previews: PreviewProvider { @State static var categories: [String] = ["上衣", "裤子", "其他"] @State static var categorySelectedIndex: Int = 0 static var previews: some View { CategorySelectView(categories: $categories, categorySelectedIndex: $categorySelectedIndex) } }
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