If you want to combine them to start the second one after first one is done use:
[UIView animateWithDuration:1.0 animations:^{
_swixValla.alpha = 0.0;
_skigoValla.alpha = 0.0;
_rodeValla.alpha = 0.0;
_startValla.alpha = 0.0;
}completion:^(BOOL finished){
[UILabel animateWithDuration:1.0 animations:^{
_swixValla.alpha = 1.0;
_skigoValla.alpha = 1.0;
_rodeValla.alpha = 1.0;
_startValla.alpha = 1.0;
}];
}];