先上效果图，诸位请看：

效果1.gif

效果2.gif

接下来介绍UIActivityViewController：

1. 创建要分享的数据内容，加在一个数组 ActivityItems里。NSString *textToShare = @"我是且行且珍惜_iOS，欢迎关注我！";UIImage *imageToShare = [UIImage imageNamed:@"wang.png"];NSURL *urlToShare = [NSURL URLWithString:@"https://github.com/wslcmk"];NSArray *activityItems = @[urlToShare,textToShare,imageToShare];   //自定义 customActivity继承于UIActivity,创建自定义的Activity加在数组Activities中。   customActivity * custom = [[customActivity alloc] initWithTitie:@"且行且珍惜_iOS" withActivityImage:[UIImage imageNamed:@"wang"] withUrl:urlToShare withType:@"customActivity" withShareContext:activityItems];NSArray *activities = @[custom];

这里需要注意：不同的 Activity 类型所支持的数据类型不同，当不支持时，应用程序支持的系统服务按钮就不会出现，比如说打印、添加书签，，，，

不同的 Activity 类型所支持的数据类型.png

/**2. //创建分享视图控制器，初始化UIActivityViewController ActivityItems  在执行activity中用到的数据对象数组。数组中的对象类型是可变的，并依赖于应用程序管理的数据。例如，数据可能是由一个或者多个字符串/图像对象，代表了当前选中的内容。 Activities  是一个UIActivity对象的数组，代表了应用程序支持的自定义服务。这个参数可以是nil。 */UIActivityViewController *activityVC = [[UIActivityViewController alloc]initWithActivityItems:activityItems applicationActivities:activities];   // 分享功能(Facebook, Twitter, 新浪微博, 腾讯微博...)需要你在手机上设置中心绑定了登录账户, 才能正常显示。//关闭系统的一些Activity类型,不需要的功能关掉。 activityVC.excludedActivityTypes = @[UIActivityTypePostToVimeo ];//Activity 类型又分为“操作”和“分享”两大类/* UIKIT_EXTERN NSString *const UIActivityTypePostToFacebook     NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypePostToTwitter      NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypePostToWeibo        NS_AVAILABLE_IOS(6_0);    //SinaWeibo UIKIT_EXTERN NSString *const UIActivityTypeMessage            NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypeMail               NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypePrint              NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypeCopyToPasteboard   NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypeAssignToContact    NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypeSaveToCameraRoll   NS_AVAILABLE_IOS(6_0); UIKIT_EXTERN NSString *const UIActivityTypeAddToReadingList   NS_AVAILABLE_IOS(7_0); UIKIT_EXTERN NSString *const UIActivityTypePostToFlickr       NS_AVAILABLE_IOS(7_0); UIKIT_EXTERN NSString *const UIActivityTypePostToVimeo        NS_AVAILABLE_IOS(7_0); UIKIT_EXTERN NSString *const UIActivityTypePostToTencentWeibo NS_AVAILABLE_IOS(7_0); UIKIT_EXTERN NSString *const UIActivityTypeAirDrop            NS_AVAILABLE_IOS(7_0); */ 3. //判断系统版本,初始化点击回调方法if([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0){    //初始化Block回调方法,此回调方法是在iOS8之后出的，代替了之前的方法    UIActivityViewControllerCompletionWithItemsHandler myBlock = ^(NSString *activityType,BOOL completed,NSArray *returnedItems,NSError *activityError)    {        NSLog(@"activityType :%@", activityType);        if (completed)        {            NSLog(@"completed");        }        else        {            NSLog(@"cancel");        }    };    // 初始化completionHandler，当post结束之后（无论是done还是cancell）该blog都会被调用    activityVC.completionWithItemsHandler = myBlock;}else{    //此Block回调方法在iOS8.0之后就弃用了，被上面的所取代    UIActivityViewControllerCompletionHandler myBlock = ^(NSString *activityType,BOOL completed)    {        NSLog(@"activityType :%@", activityType);        if (completed)        {            NSLog(@"completed");        }        else        {            NSLog(@"cancel");        }    };    // 初始化completionHandler，当post结束之后（无论是done还是cancell）该blog都会被调用    activityVC.completionHandler = myBlock;}4. //在展现view controller时，必须根据当前的设备类型，使用适当的方法。在iPad上，必须通过popover来展现view controller。在iPhone和iPodtouch上，必须以模态的方式展现。[self presentViewController:activityVC animated:YES completion:nil];

接下来介绍几个系统Activity 类型的API，用于自定义title、Image的时候用。

- (void)SystemAPI{//复制链接功能UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];pasteboard.string = @"需要复制的内容";//用safari打开网址[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://github.com/wslcmk"]];//保存图片到相册UIImage *image = [UIImage imageNamed:@"wang"];id completionTarget = self;SEL completionSelector = @selector(didWriteToSavedPhotosAlbum);void *contextInfo = NULL;UIImageWriteToSavedPhotosAlbum(image, completionTarget, completionSelector, contextInfo);//添加书签NSURL *URL = [NSURL URLWithString:@"https://github.com/wslcmk"];BOOL result = [[SSReadingList defaultReadingList] addReadingListItemWithURL:URL                                                                      title:@"WSL"                                                                previewText:@"且行且珍惜_iOS"                                                                      error:nil];if (result) {    NSLog(@"添加书签成功");}//发送短信MFMessageComposeViewController *messageComposeViewController = [[MFMessageComposeViewController alloc] init];messageComposeViewController.recipients = @[@"且行且珍惜_iOS"];//messageComposeViewController.delegate = self;messageComposeViewController.body = @"你好，我是且行且珍惜_iOS，请多指教！";messageComposeViewController.subject = @"且行且珍惜_iOS";//发送邮件MFMailComposeViewController *mailComposeViewController = [[MFMailComposeViewController alloc] init];[mailComposeViewController setToRecipients:@[@"mattt@nshipster•com"]];[mailComposeViewController setSubject:@"WSL"];[mailComposeViewController setMessageBody:@"Lorem ipsum dolor sit amet"                                   isHTML:NO];if([MFMailComposeViewController  canSendMail]){    [self presentViewController:mailComposeViewController animated:YES completion:nil];};//发送推文TWTweetComposeViewController *tweetComposeViewController =[[TWTweetComposeViewController alloc] init];[tweetComposeViewController setInitialText:@"梦想还是要有的,万一实现了呢!-----且行且珍惜_iOS"];[tweetComposeViewController addURL:[NSURL URLWithString:@"https://github.com/wslcmk"]];[tweetComposeViewController addImage:[UIImage imageNamed:@"wang"]];if ([TWTweetComposeViewController canSendTweet]) {    [self presentViewController:tweetComposeViewController animated:YES completion:nil];}}

接下来介绍自定义UIActivity，主要就是重写了以下方法：

+ (UIActivityCategory)activityCategory{// 决定在UIActivityViewController中显示的位置，最上面是AirDrop，中间是Share，下面是Actionreturn UIActivityCategoryAction;}- (NSString *)activityType{return _type;}- (NSString *)activityTitle {return _title;}- (UIImage *)_activityImage {//这个得注意，当self.activityCategory = UIActivityCategoryAction时，系统默认会渲染图片，所以不能重写为 - (UIImage *)activityImage {return _image;}return _image;}- (NSURL *)activityUrl{return _url;}- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems {return YES;}- (void)prepareWithActivityItems:(NSArray *)activityItems {//准备分享所进行的方法，通常在这个方法里面，把item中的东西保存下来,items就是要传输的数据。;}- (void)performActivity {//这里就可以关联外面的app进行分享操作了//也可以进行一些数据的保存等操作//操作的最后必须使用下面方法告诉系统分享结束了[self activityDidFinish:YES];}

UIActivityViewController系统原生分享