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];

/**
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];

//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];
}
}

- (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];}