先上效果图。从系统自带的浏览器Safari打开一个网址，分享到自己的app

具体实现步骤：

1.File->New->Target， Application Extension->Share Extension

新建文件

2.Product Name 是在分享菜单中显示的名字。

新建文件

文件建好效果
但目前这个分享扩展什么都不能做，需要完善功能。

4.先来分析ShareViewController这个类

- (void)viewDidLoad
- (BOOL)isContentValid
- (void)didSelectPost
- (NSArray *)configurationItems

viewDidLoad这个方法我们就不用说了， isContentValid来判断我们获取到得数据是否是我们想要的。didSelectPost是选择之后的方法， configurationItems 只返回一个SLComposeSheetConfigurationItem 这是一个类似tableview的列表下面会看到效果.以上三步就能实现一个简单的share Extension 编译运行之后，我们会看到一个很简单的分享页面，当然现在我们还没有做任何东西，那么怎么把我们要分享的东西，或者其他操作和我们的应用关联呢或者上传到我们的服务器呢？

直接上代码：

shareViewController代码如下

@interface ShareViewController ()
@property (strong, nonatomic) UIWebView    *webView;
@end
@implementation ShareViewController
- (BOOL)isContentValid {
    return YES;
}
- (void)didSelectPost {
    [self initWebView];
    [self parsePostUrl];
}
- (void)parsePostUrl {
    NSExtensionItem *extensionItem = self.extensionContext.inputItems.firstObject;
    NSItemProvider *itemProvider = extensionItem.attachments[0];
    NSUserDefaults *myDefaults = [[NSUserDefaults alloc]
                                  initWithSuiteName:@"group.com.yabadun.live"];
    [myDefaults setObject:self.contentText forKey:@"text"];
    [myDefaults synchronize];
    if ([itemProvider hasItemConformingToTypeIdentifier:(NSString*)kUTTypeURL]) {
        [itemProvider loadItemForTypeIdentifier:(NSString*)kUTTypeURL options:nil completionHandler:^(NSURL *url, NSError *error) {
            [self.extensionContext completeRequestReturningItems:@[] completionHandler:^(BOOL expired) {
                [self openAppWithURL:url.absoluteString text:self.contentText];
            }];
        }];
    }
}
- (NSArray *)configurationItems {
    return @[];
}
- (void)initWebView {
    self.webView = [[UIWebView alloc] init];
    [self.view addSubview:self.webView];
}
- (void)openAppWithURL:(NSString*)urlString text:(NSString*)text {
    UIResponder* responder = self;
    while ((responder = [responder nextResponder]) != nil) {
        if ([responder respondsToSelector:@selector(openURL:)] == YES) {
            [responder performSelector:@selector(openURL:) withObject:[NSURL URLWithString:[NSString stringWithFormat:@"wolaiSocial://%@", [self urlStringForShareExtension:urlString text:text]]]];
        }
    }
}
- (NSString*)urlStringForShareExtension:(NSString*)urlString text:(NSString*)text {
    NSString* finalUrl=[NSString stringWithFormat:@"%@____%@", text, urlString];
    finalUrl =  (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(
                                                                                      NULL,
                                                                                      (CFStringRef)finalUrl,
                                                                                      NULL,
                                                                                      (CFStringRef)@"!*'();:@&=+$,/?%#[]",
                                                                                      kCFStringEncodingUTF8 ));
    return finalUrl;
}
@end

然后在appdelegate实现如下

#pragma mark Handle app open from share extention
- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation {
    if ([url.description hasPrefix:@"wolaiSocial"]) {
        [POIShareHelper shareFromURL:url];
    }
}
//iOS 9 及以上
- (BOOL)application:(UIApplication *)app
openURL:(NSURL *)url
options:(NSDictionary *)options {
    if ([url.description hasPrefix:@"wolaiSocial"]) {
        [**POIShareHelper shareFromURL:url**];
    }
}

POIShareHelper主要实现如下：通过url，获取该网页的标题和图片分享到app内部的社区模块

#import "POIHtmlParser.h"    //解析html内容
#import "POIShareHelper.h"
#import "POIUploaderHelper.h"  //图片处理
#import "POIPublishRequest.h"  //发布到社区模块
#import "POIExploreViewController.h"

@implementation POIShareHelper
+ (void)shareFromURL:(NSURL *)url{
    [self shareFromWolaiSocial:url];
}
+ (void)shareFromWolaiSocial:(NSURL *)url{
    NSString *attrStr = [NSString poi_urlStringFromShareExtension:url.absoluteString];
    NSArray* attrArr = [attrStr componentsSeparatedByString:@"____"];
    if([attrArr count] > 1){
        NSString* text = attrArr[0];
        NSString* linkUrl = attrArr[1];
        POIHtmlParser *parser = [[POIHtmlParser alloc] initWithUrl:attrArr[1]];
        if(parser.imageUrl && ![parser.imageUrl isEqualToString:@""])
        {
            NSURL *url = [NSURL URLWithString:parser.imageUrl];
            UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:url]];
            [POIUploaderHelper uploadImage:image completion:^(id responseObject) {
                NSString* linkImage = @"";
                if ([responseObject isKindOfClass:[NSString class]])
                {
                    linkImage = (NSString*)responseObject;
                }
                [self handleShareLinkImageUploadFinished:@{
                                                           @"linkURL":linkUrl,
                                                           @"text":text,
                                                           @"linkTitle":parser.title,
                                                           @"linkImage":linkImage
                                                           }];
            } progress:^(float percent) {
            } failed:^{
                [self handleShareLinkImageUploadFinished:@{
                                                           @"linkURL":linkUrl,
                                                           @"text":text,
                                                           @"linkTitle":parser.title,
                                                           @"linkImage":@""
                                                           }];
            }];
        }else{
            [self handleShareLinkImageUploadFinished:@{
                                                       @"linkURL":linkUrl,
                                                       @"text":text,
                                                       @"linkTitle":parser.title,
                                                       @"linkImage":@""
                                                       }];
        }
    }
}
+ (void)handleShareLinkImageUploadFinished:(id)object {
    NSString* linkURL = [object objectForKey:@"linkURL"];
    NSString* linkImage = [object objectForKey:@"linkImage"];
    NSString* linkTitle = [object objectForKey:@"linkTitle"];
    NSString* text = [object objectForKey:@"text"];
    [POIPublishRequest requestPublishWithUrl:linkURL text:text linkImage:linkImage linkTitle:linkTitle complete:^(NSInteger stastus) {
        [SVProgressHUD showSuccessWithStatus:@"分享成功！"];
    } failure:^{
            [MBProgressHUD showMessage:@"分享失败" afterDelay:2.0f];
    }];
}
@end

至于html解析与图片处理的类就不放了，方法有很多。仅供参考哈~ 有不对或有什么问题的地方欢迎纠正