如何打破外部循环从内部结构响应打破(循环/开关)

在 Swift 中，如何从响应 break语句的嵌套结构中切断外部循环？

例如:

while someCondition {
if someOtherCondition {
switch (someValue) {
case 0:     // do something
case 1:     // exit loop
case 2...5: // do something else
default:    break
}
} else {
someCondition = false
}
}

break只能让我离开 switch，而在 Swift 中，它必须被用作不允许使用的空格。如何完全从 switch中退出循环？

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最佳答案

Swift allows for labeled statements. Using a labeled statement, you can specify which which control structure you want to break from no matter how deeply you nest your loops (although, generally, less nesting is better from a readability standpoint). This also works for continue.

Example:

outerLoop: while someCondition {
if someOtherCondition {
switch (someValue) {
case 0:     // do something
case 1:     break outerLoop // exit loop
case 2...5: // do something else
default:    break
}
} else {
someCondition = false
}
}