ios - 如何在Objective-C中检查多个Switch大小写值？

Question

在 Swift 中，possible用于检查类似的元组，

switch(type1, type2) {
    case (1, 1):
        functionNormal()
    case (1, 2):
        functionUncommon()
    case (1, 3):
        functionRare()
    ...
}

是否可以在 Objective-C 切换的情况下检查类似多个值的元组？ 可以吗？

Answer 1

可能有多种方法，具体取决于您的type1和type2数据可能是什么。

但是，这是一个基本示例:

NSInteger i = 1;
NSInteger j = 2;

switch (i) {
    case 1:
        switch (j) {
            case 1:
                [self functionNormal];
                break;

            case 2:
                [self functionUncommon];
                break;

            case 3:
                [self functionRare];
                break;

            default:
                NSLog(@"first value: 1 ... missing case for second value: for %ld", (long)j);
                break;
        }
        break;

    case 2:
        switch (j) {
            case 1:
                [self secondFunctionNormal];
                break;

            case 2:
                [self secondFunctionUncommon];
                break;

            case 3:
                [self secondFunctionRare];
                break;

            default:
                NSLog(@"first value: 2 ... missing case for second value: %ld", (long)j);
                break;
        }
        break;

    default:
        NSLog(@"missing first case for first value: %ld", (long)i);
        break;
}

当然，这效率很低，但是也许可以带您上路。

编辑

同样，这将取决于您的数据，但是另一种方法更类似于您的Swift示例:

NSInteger i = 1;
NSInteger j = 2;

NSInteger ij = i * 1000 + j;

switch (ij) {
    case 1001:
        [self functionNormal];
        break;

    case 1002:
        [self functionUncommon];
        break;

    case 1003:
        [self functionRare];
        break;

    case 2001:
        [self secondFunctionNormal];
        break;

    case 2002:
        [self secondFunctionUncommon];
        break;

    case 2003:
        [self secondFunctionRare];
        break;

    default:
        NSLog(@"case was something else: %ld", (long)ij);
        break;
}