系统自带分享格式：

需求：

通过IOS系统原生的分享集成Facebook 的应用邀请 功能。

前期准备：

配置Facebook分享的一些必要库到自己的工程，详细教程可以看看facebook官网
https://developers.facebook.com/docs/sharing/ios 国内用户需要翻墙哦！

下面介绍下必要的步骤供大家参考：
1.在Facebook 官网注册并关联你的app 具体地址：https://developers.facebook.com/docs/ios/getting-started/
2.下载并导入必要的.framework文件

image.png

3.配置你的项目.plist文件 看下几个关键点

image.png

4.在你的AppDelegate.m中加入以下代码：

- (BOOL)application:(UIApplication *)application
didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    [[FBSDKApplicationDelegate sharedInstance] application:application
                             didFinishLaunchingWithOptions:launchOptions];

    // Add any custom logic here.
    return YES;
}

- (BOOL)application:(UIApplication *)application
            openURL:(NSURL *)url
            options:(NSDictionary<UIApplicationOpenURLOptionsKey,id> *)options {

    BOOL handled = [[FBSDKApplicationDelegate sharedInstance] application:application
                                                                  openURL:url
                                                        sourceApplication:options[UIApplicationOpenURLOptionsSourceApplicationKey]
                                                               annotation:options[UIApplicationOpenURLOptionsAnnotationKey]
                    ];
    // Add any custom logic here.
    return handled;
}

-(void)applicationDidBecomeActive:(UIApplication*)application
{
    [FBSDKAppEvents activateApp];
}

5.关键的一步 通过UIActivityViewController发起分享 看下参考代码：

- (void)showActivityViewController {
    NSString *textToShare = @"logo";
    UIImage* imageShare = [UIImage imageNamed:@""];
    NSArray *activityItems = @[textToShare, imageShare];

    UIActivityViewController *activityViewController = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:nil];
    activityViewController.excludedActivityTypes = @[UIActivityTypeAirDrop];

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {//适配ipad
        [activityViewController setModalPresentationStyle:UIModalPresentationFormSheet];

        UIPopoverPresentationController *popPresenter = [activityViewController popoverPresentationController];
        popPresenter.sourceView = self.view;
        popPresenter.sourceRect = self.view.bounds;
        popPresenter.permittedArrowDirections = 0;
    }

    [self presentViewController:activityViewController animated:YES completion:nil];
    //分享结果回调方法
    UIActivityViewControllerCompletionHandler myblock = ^(NSString *type,BOOL completed){
        //new
        NSLog(@"%d %@",completed,type);
        if ([type isEqualToString:@"com.apple.UIKit.activity.PostToFacebook"]) {
            [self inviteFBFriends];
        }

    };
    activityViewController.completionHandler = myblock;

}

//new
-(void)inviteFBFriends
{
    if (![FBSDKAccessToken currentAccessToken])
    {
        FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

        [login logInWithReadPermissions:@[@"public_profile",@"email", @"user_photos"] fromViewController:self handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {

            if (error) {
                // Process error

            } else if (result.isCancelled) {
                // Handle cancellations

            } else if([FBSDKAccessToken currentAccessToken]){
                [self shareLinkContent];
            }
        }];
        return;
    }else {
        [self shareLinkContent];
    }

}
//new
//分享链接
- (void)shareLinkContent {
    FBSDKShareLinkContent *content = [[FBSDKShareLinkContent alloc] init];
    content.contentURL = [NSURL URLWithString:@"https://www.jianshu.com/"];
    [FBSDKShareDialog showFromViewController:self withContent:content delegate:nil];
}

5.特别注意的地方：

image.png

其他可能出现的问题补充：
1.IOS11上分享总是不成功可以参考这篇文章：https://www.jianshu.com/p/fe4aaa54288f
2.白名单问题参考https://developers.facebook.com/docs/ios/ios9

注意： 国行的手机分享到facebook时是没有反应的哦

使用Branch分享方式：

配置：

1.在Branch配置相关APP信息https://docs.branch.io/pages/apps/ios/#share-message-dynamically
2.导入BranchSDK
3.代码

//这里使用的是BranchUniversalObject和BranchLinkProperties来配置分享的内容和自定义的信息 供前端和后台之间的数据调试
    NSString *textShare = [NSString stringWithFormat:@"Come to see the design of my dream home, I need you to back me up."];
    NSString *facebookShare =  [[[ConfigManager sharedInstance] inviteFriendLink] stringByReplacingOccurrencesOfString:@"{{ID}}" withString:[UserManager sharedInstance].currentUser.userID];
    NSString * userID = [[[UserManager sharedInstance] currentUser] userID];

    BranchUniversalObject *buo = [[BranchUniversalObject alloc] init];
    buo.publiclyIndex = YES;
    buo.locallyIndex = YES;
    buo.imageUrl = IMAGEURL;
    buo.contentDescription = textShare;
    buo.contentMetadata.customMetadata[kBranchDicParamsUserId] = userID;
    buo.title = [NSString stringWithFormat:@"%@ on Homestyler",[UserManager sharedInstance].currentUser.getUserFullName];

    BranchLinkProperties *lp = [[BranchLinkProperties alloc] init];
    lp.feature = kBranchFeature;
    [lp addControlParam:kBranchAddControliOS_URL withValue:facebookShare];
    [buo showShareSheetWithLinkProperties:lp andShareText:textShare fromViewController:self completion:^(NSString* activityType, BOOL completed) {
        HSMDebugLog(@"finished presenting");
    }];

也可以使用下面的方式进行分享

    BranchShareLink *shareLink = [[BranchShareLink alloc] initWithUniversalObject:buo linkProperties:lp];
    shareLink.delegate  = self;
    [shareLink presentActivityViewControllerFromViewController:self anchor:nil];

#pragma mark - BranchShareLinkDelegate
- (void) branchShareLinkWillShare:(BranchShareLink*)shareLink {
    shareLink.shareText = [NSString stringWithFormat:@"%@", shareLink.linkProperties.channel];
    shareLink.title = [NSString stringWithFormat:@"%@ on Homestyler",[UserManager sharedInstance].currentUser.getUserFullName];
}
- (void) branchShareLink:(BranchShareLink*_Nonnull)shareLink
             didComplete:(BOOL)completed
               withError:(NSError*_Nullable)error{
    if(error){

    }
}