SwiftUI:删除 ForEach 中的最后一行 [英] SwiftUI: Deleting last row in ForEach

问题描述

我正在尝试删除 ForEach 中的行.删除最后一行总是会引发索引超出范围异常.删除任何其他行不会.

I am trying to remove rows inside a ForEach. Removing the last row always throws an index out of range exception. Removing any other row does not.

ForEach(Array(player.scores.enumerated()), id: .element) { index, score in
    HStack {
        if self.isEditSelected {
            Button(action: {
                self.player.scores.remove(at: index)
            }, label: {
                Image("delete")
            })
        }        
        TextField("(score)", value: self.$player.scores[index], formatter: NumberFormatter())
    }
}

我尝试过使用 ForEach(player.indices...) &ForEach(player.scores...)，但看到同样的问题.

I have tried using ForEach(player.indices...) & ForEach(player.scores...), but see the same problem.

在我看来，崩溃发生在这里self.$player.scores[index]，因为将索引硬编码为除最后一行有效之外的任何值.

Looks to me like the crash happens here self.$player.scores[index], as hardcoding the index to any value other that the last row is working.

有谁知道如何解决这个问题?或者如果有更好的方法.

Does anyone know how to fix this? Or if there is a better approach.

推荐答案

这里是修复

ForEach(Array(player.scores.enumerated()), id: .element) { index, score in
    HStack {
        if self.isEditSelected {
            Button(action: {
                self.player.scores.remove(at: index)
            }, label: {
                Image("delete")
            })
        }        
        TextField("(score)", value: Binding(   // << use proxy binding !!
            get: { self.player.scores[index] },
            set: { self.player.scores[index] = $0 }), 
            formatter: NumberFormatter())
    }
}

这篇关于SwiftUI:删除 ForEach 中的最后一行的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！