iOS Swift:致命错误:索引超出范围 [英] iOS Swift : fatal error: Index out of range

问题描述

我正在尝试删除索引处的对象，但出现错误.这是我的代码:

I'm trying to remove an object at an index but I'm getting an error. Here is my code:

var arr2 = [3,5,6]

let arr3 = arr2
for (index, element) in arr3.enumerated() {
    print("III \(index)")
    arr2.remove(at: index)
}

日志:

 III 0
 III 1
 III 2
 fatal error: Index out of range

请让我知道我在做错什么.

Please let me know what I'm doing wrong.

推荐答案

您的index值基于arr3.当您从arr2中删除项目时，index并不代表arr2中的正确位置.

Your index value is based on arr3. As you remove items from arr2 that index doesn't represent the proper location in arr2.

一种解决方案是反向迭代arr3.

One solution is to iterate arr3 in reverse.

for (index, element) in arr3.enumerated().reversed() {

这使其余索引与迭代继续相同.

This keeps the remaining indexes the same as the iteration continues.

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