if/else if statement

I need to control several values in my app and I'm trying to do so in this way

Code:

if(condition 1)
{
   //do something1
}
else if(condition 2)
{
   //do something2
}
else if(condition 3)
{
   //do something3
}
else
{
   //do something else
}

but it looks that only the 1st condition is checked, the other are ignored.
Is it possible to use this kind of control in objective-c? If not, how to do something that behaves like that?
I'm checking if some text fields are filled before to send the data.

 

Thanks for your answers, the problem was only due to a lack of attention, what I want to do with this code is to check if required fields of a form are filled in or not.
The problem was that I have a label on the side of each field which shows a text "Field required" if the related field is not filled in, but in the code I had the messages all linked to the 1st label and it seemed to me that the 1st condition was always true.