PrepareForSegue mystery

Question

I\'ve got a prepareForSegue method in two different VCs. One uses an if statement, while the other is intended to use a switch. The code is virtually i

Answer 1

There are two separate problems here.

You can declare a variable in C/Objective-C in a switch-statement (without the need for an additional { ... } scope), but not immediately following a label. To solve this problem it is sufficient to insert a semicolon after the label:

switch (i) {
    case 0: ;
        int i;
        // ...
        break;

    default:
        break;
}

Only if you declare Objective-C objects and compile with ARC, then you have to introduce an additional scope:

switch (i) {
    case 0: {
        NSObject *obj;
        // ...
        } break;

    default:
        break;
}

The reason is that the ARC compiler needs to know the precise lifetime of the object.