Convenience label for displaying app name, app version and copyright dates automatically

EYVersionLabel.h

// erkanyildiz
// 20161004-1321+0900
//
// EYVersionLabel.h

#import <UIKit/UIKit.h>

@interface EYVersionLabel : UILabel
@property (nonatomic, strong) NSNumber* initialYear;
@end

EYVersionLabel.m

// erkanyildiz
// 20161004-1321+0900
//
// EYVersionLabel.m


#import "EYVersionLabel.h"

@implementation EYVersionLabel

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self)
    {
        [self commonInit];
    }
    return self;
}


- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super initWithCoder:aDecoder];
    
    if(self)
    {
        [self commonInit];
    }
    
    return self;
}


- (void)commonInit
{
    self.numberOfLines = 2;
    self.textAlignment = NSTextAlignmentCenter;
    
    NSCalendar *calendar = [NSCalendar.alloc initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [calendar components:NSCalendarUnitYear fromDate:[NSDate date]];
    NSInteger year = [components year];
    [self setInitialYear:@(year)];
}


- (void)setInitialYear:(NSNumber *)year
{
    //NOTE: Directly can be set in InterfaceBuilder as User Defined Runtime Attribute
    // e.g. Key Path,    Type,   Value
    //      InitialYear, Number, 2015

    NSString* version = [NSString stringWithFormat:@"%@  v%@", NSBundle.mainBundle.infoDictionary[@"CFBundleDisplayName"], NSBundle.mainBundle.infoDictionary[@"CFBundleShortVersionString"]];
    
    NSCalendar *calendar = [NSCalendar.alloc initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDateComponents *components = [calendar components:NSCalendarUnitYear fromDate:[NSDate date]];
    NSInteger currentYear = [components year];    NSInteger initialYear = year.integerValue;
    NSString* copyright = [NSString stringWithFormat:@"\nCopyright © %li", (long)initialYear];    
    if(initialYear < currentYear)
        copyright = [copyright stringByAppendingFormat:@" - %li", (long)currentYear];

    NSMutableAttributedString * as = [NSMutableAttributedString.alloc initWithString:version attributes:nil];
    [as appendAttributedString:[NSMutableAttributedString.alloc initWithString:copyright attributes:@{NSFontAttributeName:[self.font fontWithSize:self.font.pointSize*0.7]}]];
    
    self.attributedText = as;
}

@end