Social share in iOS

SocialShare.m

#import "SocialShare.h"
#import <Social/Social.h>

@interface SocialShare()
{
    SLComposeViewController *composeViewController;
}

@end

@implementation SocialShare

- (id)init
{
    if (self = [super init]) {
        ;
    }
    return self;
}

+ (SocialShare *)sharedSocialShare
{
    __strong static SocialShare *share = nil;
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        share = [[self alloc] init];
    });
    return share;
}

- (void)shareToTwitterWithRootViewController:(UIViewController *)controller title:(NSString *)title content:(NSString *)content
{
    [self shareWithServiceType:SLServiceTypeTwitter
            rootViewController:controller
                         title:title
                       content:content];
}

- (void)shareToFacebookWithRootViewController:(UIViewController *)controller title:(NSString *)title content:(NSString *)content
{
    [self shareWithServiceType:SLServiceTypeFacebook
            rootViewController:controller
                         title:title
                       content:content];
}

- (void)shareToSinaWeiboWithRootViewController:(UIViewController *)controller title:(NSString *)title content:(NSString *)content
{
    [self shareWithServiceType:SLServiceTypeSinaWeibo
            rootViewController:controller
                         title:title
                       content:content];
}

- (void)shareByActivityWithRootViewController:(UIViewController *)controller title:(NSString *)title content:(NSString *)content
{
    NSArray *activityitems = @[[title stringByAppendingFormat:@"\n%@", content]];
    
    UIActivityViewController *activityController = [[UIActivityViewController alloc] initWithActivityItems:activityitems applicationActivities:nil];
    [controller presentViewController:activityController animated:YES completion:^{
        ;
    }];
}

- (void)shareWithServiceType:(NSString *)serviceType rootViewController:(UIViewController *)controller title:(NSString *)title content:(NSString *)content
{
    if([SLComposeViewController isAvailableForServiceType:serviceType])
    {
        composeViewController = [SLComposeViewController composeViewControllerForServiceType:serviceType];
        [composeViewController setInitialText:[title stringByAppendingFormat:@"\n%@", content]];
        [composeViewController addURL:[NSURL URLWithString:@"http://victorchee.github.com/"]];
        [controller presentViewController:composeViewController animated:YES completion:^{
            ;
        }];
    }
    else
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Oops!"
                                                        message:@"Social service is unavailable."
                                                       delegate:nil
                                              cancelButtonTitle:@"Don't send it."
                                              otherButtonTitles:nil, nil];
        [alert show];
        alert = nil;
    }
}

@end