iOS break loop with switch

Question

I have a loop like this:

label: for(X *y in z)
    {
        switch(y.num)
        {
          case ShouldDoSomething:
            [self somethingWithX:y];
            break;
          case ShouldStopNow:
            y = [self valWhenStopped];
            break label;
        }
        [val append y];
    }

Of course, since Objective-C does not support loop labeling (at least, when I try, it throws a compile error saying Expected ';' after break statement), this doesn't work. Is there a way I can break a loop using a switch case in Objective-C? If not, what's a best practice with the same effect?

Answer 1

A solution is to put the whole expression into a method and exit the switch statement with return.

- (void)checkSomething:(id)object
{
  for(X *y in object)
  {
    switch(y.num)
    {
      case ShouldDoSomething:
        something();
        break;
      case ShouldStopNow:
        return;
        break;
    }
    somethingElse();
  }
}

Another solution is using a boolean flag

for(X *y in Z)
  {
    BOOL willExitLoop = false;
    switch(y.num)
    {
      case ShouldDoSomething:
        something();
        break;
      case ShouldStopNow:
        willExitLoop = true;
        break;
    }
    if (willExitLoop) break;
    somethingElse();
  }