The first is workaround wich is iterating over all the labels in your UIView and change the labels font, check this question and the answers: How to set a custom font for entire iOS app without specifying size.
The Second is creating a Category for your control:
@implementation UILabel (MyCustomLabel)
-(void)awakeFromNib{
float fontSize = [self.font pointSize];
self.font = [UIFont fontWithName:@"MyCustomFont" size:fontSize];
}
@end