Поместите каждый символ в его собственный экземпляр UIView и анимируйте свойство center
.
//let's say we have a custom UIView subclass that displays a character called 'MYCharacterView'
MYCharacterView * view = [[MYCharacterView alloc] initWithFrame:CGRectMake(50.0, -10.0, 20.0, 20.0);
// ... configure the view here, e.g., set the character, etc. ...
[UIView beginAnimations:nil context:nil];
//animate the view from its current position off the top of the screen to 50, 200
//over 2 seconds
[view setCenter:CGPointMake(50.0, 200.0)];
[UIView setAnimationDuration: 2.0];
[UIView commitAnimations];
Надеюсь, это поможет!