What is causing this: Cannot jump from switch statement to this case label

C is not Swift. You’ll be happier if you structure your switch statements using curly braces round all of the cases interiors, like this:

switch (tag) {
    case 1: { // curly braces
        // ...
        break;
    }
    case 2: {  // curly braces
        // ...
        break;
    }
    case 3: {  // curly braces
        // ...
        break;
    }
}

The extra level of curly braces allows you to do things you can’t do otherwise.