适用于iOS/Objective-C的switch语句

Question

假设我有一个包含五种情况的switch语句,但只调用了两种真正的方法,如下所示:

switch (condition) {
    case conditionOutcome1: 

        [self firstMethod];
        break;

    case conditionOutcome2: 
        [self secondMethod];
        break;

    case conditionOutcome3:

        [self firstMethod];
        break;

    case conditionOutcome4: 

        [self firstMethod];

        break;
    case conditionOutcome5: 

        [self secondMethod];
        break;

    default:
        break;
}

将案件分组是否安全,如此？

    switch (condition) {

    case conditionOutcome1:
    case conditionOutcome3:
    case conditionOutcome4: 

        [self firstMethod];
        break;

    case conditionOutcome2: 
    case conditionOutcome5: 

        [self secondMethod];
        break;


    default:
        break;
}

它工作正常,但我之前从未在objective-c中使用它,所以我想通过保存几行代码来确保我没有引起任何问题.

谢谢!

Answer 1

只是添加到其他答案,它被称为一个秋天,你可以在这里阅读它.

Answer 2

是的,这样做很好.

我之前用过它.它会停止重复的代码.

Answer 3

是100%安全使用

开关(条件){

case conditionOutcome1:
case conditionOutcome3:
case conditionOutcome4: 

    [self firstMethod];
    break;

case conditionOutcome2: 
case conditionOutcome5: 

    [self secondMethod];
    break;


default:
    break; }

对于case具有相同动作集(重复代码)的多个s,总是使用它.

因为所有的cases将被执行直到break遇到.