切换到 swift 编译但永远运行

Question

我学习 swift atm 和 switch 语句是迄今为止最困难的部分。

下面的代码是为了简单地计算数组中的每一个投票，我希望它通过一个开关（！）来完成。

我的问题：

1. 为什么操场一直跑？ （重启了几次）
2. 导入基础重要吗？ （那行不是我的代码）

我更感兴趣的是它为什么不起作用以及它是如何工作的，而不是真正对正确的代码感兴趣。我很高兴有任何帮助！

    import UIKit
enum SchoolMascotOption {
    case salamander, marmot, neither
}
import Foundation
let mascotVotes: [SchoolMascotOption] = [.neither, .marmot, .salamander, .neither, .marmot, .neither, .neither, .marmot, .neither, .salamander, .salamander, .marmot, .neither, .neither, .salamander, .neither, .neither, .marmot, .salamander, .neither, .neither, .neither, .marmot, .marmot, .neither, .neither, .marmot, .salamander, .neither, .marmot, .marmot, .marmot, .marmot, .neither, .salamander, .salamander, .salamander, .salamander, .salamander, .salamander, .salamander, .marmot, .neither, .salamander, .salamander, .neither, .salamander, .neither, .salamander, .salamander, .salamander, .salamander, .salamander, .salamander, .marmot, .neither, .neither, .marmot, .salamander, .neither, .neither, .salamander, .salamander, .neither, .salamander, .salamander, .salamander, .salamander, .neither, .salamander, .neither, .salamander, .marmot, .salamander, .marmot, .salamander, .salamander, .marmot, .salamander, .neither, .marmot, .marmot, .marmot, .salamander, .marmot, .salamander, .marmot, .neither, .marmot, .neither, .salamander, .marmot, .marmot, .marmot, .neither, .marmot, .marmot, .salamander, .neither, .neither, .salamander, .neither, .neither, .marmot, .neither, .salamander, .salamander, .salamander, .neither, .neither, .salamander, .salamander, .salamander, .marmot, .salamander, .salamander, .marmot, .salamander, .neither, .marmot, .marmot, .neither, .neither, .salamander, .marmot, .neither, .marmot, .salamander, .salamander, .marmot, .salamander, .neither, .salamander, .marmot, .neither, .salamander, .marmot, .marmot, .salamander, .marmot, .salamander, .marmot, .salamander, .salamander, .marmot, .marmot, .neither, .marmot, .neither, .marmot, .salamander, .salamander, .salamander, .neither, .salamander, .salamander, .neither, .marmot, .neither, .marmot, .marmot, .marmot, .marmot, .neither, .marmot, .neither, .salamander, .marmot, .salamander, .neither, .salamander, .salamander, .marmot, .neither, .marmot, .neither, .salamander, .neither, .salamander, .neither, .neither, .marmot, .salamander, .neither, .marmot, .salamander, .marmot, .neither, .salamander, .neither, .neither, .salamander, .salamander, .salamander, .neither, .salamander, .neither, .marmot, .salamander, .marmot]

var salamanderCounts = 0
var marmotCounts = 0
var neitherCounts = 0

for vote in mascotVotes {

    switch vote {
    case .salamander :
        salamanderCounts += 1
    case .marmot :
        marmotCounts += 1
    case .neither :
        neitherCounts += 1
    }
}
print(salamanderCounts)
print(marmotCounts)
print(neitherCounts)

screenshot

谢谢大家帮忙！！！

Answer 1

我想在操场上运行它不会仅仅因为数组的大小而闪电般快速。

import Foundation 在你 import UIKit 时是多余的，因为 UIKit 包括 Foundation（尽管在这个操场上两者都不需要）。

尝试从 Playground 中删除所有代码，等待 Playground 不再说“正在运行”或类似的话，然后将其粘贴回去。

如果这不能解决问题，请尝试将数组设置为五个元素，以确保长度不是问题。

祝你好运！