UIActivityViewController

NSString *textToShare = @"分享的标题";   
UIImage *imageToShare = [UIImage imageNamed:@"test.jpg"];   
NSURL *urlToShare = [NSURL URLWithString:@"http://www.baidu.com"];  
//NSURL * urlToShare = [[NSBundle mainBundle] URLForResource:@"test" withExtension:@"zip"];  

NSArray *activityItems = @[textToShare, imageToShare, urlToShare];  
UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:nil];  

/*
 不想显示的type
 activityVC.excludedActivityTypes = @[];
 点击的回调
 activityVC.completionWithItemsHandler = 
 */

[self presentViewController:activityVC animated:YES completion:nil];

Social Framework

#import <Social/Social.h>  

SLComposeViewController *composeVc = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeSinaWeibo];  

if (composeVc == nil){  
    NSLog(@"未安装软件");  
    return;  
}  

if (![SLComposeViewController isAvailableForServiceType:SLServiceTypeSinaWeibo]) {  
    NSLog(@"软件未配置登录信息");  
    return;  
}  

//添加分享的文字、图片、链接  
[composeVc setInitialText:@"要分享的文本内容"];  
[composeVc addImage:[UIImage imageNamed:@"choice_highlight"]];  
[composeVc addURL:[NSURL URLWithString:@"http://www.baidu.com"]];  
[self presentViewController:composeVc animated:YES completion:nil];  
//监听用户点击了取消还是发送  

composeVc.completionHandler = ^(SLComposeViewControllerResult result){

    if (result == SLComposeViewControllerResultCancelled) {

    } else {
    
    }
};

系统只提供了下面几种分享平台：

SLServiceTypeTwitter;  
SLServiceTypeFacebook;  
SLServiceTypeSinaWeibo;  
SLServiceTypeTencentWeibo;  
SLServiceTypeLinkedIn;

实际可以根据id来分享到更多平台，如微信:

NSString *socialType = @"com.tencent.xin.sharetimeline";  
SLComposeViewController *composeVC = [SLComposeViewController composeViewControllerForServiceType:socialType];

可以这么使用的原因是:iOS8之后系统推出的Share Extension,不是系统实现了微信分享，而是微信App的Share Extension提供了分享入口。所以这个不是私有API，可以放心使用，想获取手机中装的App的所有Share Extension的方法。只需调用下面一句代码。

SLComposeViewController *composeVc = [SLComposeViewController composeViewControllerForServiceType:SLServiceTypeSinaWeibo];

看看控制台输出，手机内所有可用的Share Extension的bundle Id 都出来了。
img