Using custom fonts with dynamic type without jumping through a thousand hoops.

UIFont+Sanity.m

@interface UIFont (Sanity)
+(UIFont*)preferredFontForTextStyle:(NSString *)style withFontFamily:(NSString*)family;
@end

@implementation UIFont (Sanity)

+(UIFont*)preferredFontForTextStyle:(NSString*)style withFontFamily:(NSString*)family
{
	UIFont *font = nil;
	UIFontDescriptor *descriptor = nil;
	
	// Font family and size
	descriptor = [UIFontDescriptor preferredFontDescriptorWithTextStyle:style];
	descriptor = [UIFontDescriptor fontDescriptorWithName:family size:descriptor.pointSize];
		
	// Font traits for special styles.
	if ([style isEqual:UIFontTextStyleHeadline]) {
		descriptor = [descriptor fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitBold];
	} else if ([@[UIFontTextStyleCaption1, UIFontTextStyleCaption2] containsObject:style]) {
		descriptor = [descriptor fontDescriptorWithSymbolicTraits:UIFontDescriptorTraitItalic];
	}
	
	font = [UIFont fontWithDescriptor:descriptor size:descriptor.pointSize];
	
	return font;
}

@end