swift3 - Swiftlint 警告：对于 Where 违规：`where` 子句优于 `for` 中的单个 `if`。(for_where)

Question

我正在使用 swift 进行应用程序开发并使用 Swift lint。但我收到有关以下代码的警告：

for settingsKeys in searchResults {

        if  settingsKeys.key == settingsObject.key {
          settingsKeys.value = settingsObject.value
          try context.save()
        }
      }

特此附上截图：

没有可用的自动修复选项，那么如何消除此警告？

Answer 1

您的 swiftlint 配置首选的语法是：

for settingsKeys in searchResults where settingsKeys.key == settingsObject.key {
    settingsKeys.value = settingsObject.value
    try context.save()
}

哪个类似于

for settingsKeys in (searchResults.filter { $0.key == settingsObject.key }) {
    settingsKeys.value = settingsObject.value
    try context.save()
}

如果你知道只有一个结果相同key，你可以直接使用

if let settingsKeys = (searchResults.first { $0.key == settingsObject.key }) {
    settingsKeys.value = settingsObject.value
    try context.save()
}

Answer 2

看起来它希望where成为……的一部分for。</p>

for settingsKeys in searchResults where settingsKeys.key == settingsObject.key {
    settingsKeys.value = settingsObject.value
    try context.save()
}