How to check multiple Switch case value in Objective-C?

Question

In Swift it is possible to check a tuple like,

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

Is it possible to check tuple like multiple values in Objective-C Switch case? Any way around?

Answer 1

There could be various approaches, depending on exactly what your type1 and type2 data might be.

However, here is a basic example:

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;
}

This is rather inefficient, of course, but maybe it can get you on your way.

---

Edit

Again, it will depend on your data, but another approach more closely resembling your Swift example:

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;
}