Take a look at GSBorderLabel.
It's good because it adds outer border and not inner border on characters and it's very easy to customise it.
For example:
GSBorderLabel *myLabel = [[GSBorderLabel alloc] initWithFrame:CGRectMake(0, 50, 300, 100)];
myLabel.textColor = [UIColor yellowColor];
myLabel.textAlignment = NSTextAlignmentCenter;
myLabel.borderColor = [UIColor grayColor];
myLabel.borderWidth = 20;
myLabel.text = @"Review";
myLabel.font = [UIFont fontWithName:@"Party LET" size:60.0];