摘要: 应用中经常会使用分享功能对多媒体内容进行分享，
     目前常用的方法是使用第三方平台进行分享，
     例如极光、友盟等等，但是使用第三方分享往往意味着要导入SDK，
     增加应用复杂程度及管理难度。这里我们使用iOS自带的分享功能对多媒体内容进行分享，
     使用自带的分享功能可以大大节省开发时间，
     降低维护及管理难度，缺点是可供分享的社交平台较少。

#import "ViewController.h"

@interface ViewController ()<UIDocumentInteractionControllerDelegate>

@property (nonatomic,strong)UIDocumentInteractionController *documentInteractionController;

@property (weak, nonatomic) IBOutlet UIButton *openIn;
@property (nonatomic,strong) UIButton *shareB;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    _shareB = [[UIButton alloc]initWithFrame:CGRectMake([UIScreen mainScreen].bounds.size.width * 0.5 - 75, 250, 150, 50)];
    [_shareB setTitle:@"Share" forState:UIControlStateNormal];
    _shareB.backgroundColor = [UIColor grayColor];
    [_shareB setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
    [_shareB addTarget:self action:@selector(shareIn:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_shareB];

}

- (IBAction)openIn:(UIButton *)sender {
    NSString *localPath = [[NSBundle mainBundle] pathForResource:@"123" ofType:@"pdf"];
    NSURL *pathUrl = [[NSURL alloc]initFileURLWithPath:localPath];

    // Initialize Document Interaction Controller
    self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:pathUrl];

    // Configure Document Interaction Controller
    [self.documentInteractionController setDelegate:self];

    // Present Open In Menu
    [self.documentInteractionController presentOptionsMenuFromRect:[self.openIn frame] inView:self.view animated:YES];
}

#pragma mark Document Interaction Controller Delegate Methods
- (UIViewController *) documentInteractionControllerViewControllerForPreview: (UIDocumentInteractionController *) controller {
    return self;
}

- (void)shareIn:(UIButton *)shareb{

        NSString *localPath = [[NSBundle mainBundle] pathForResource:@"123" ofType:@"pdf"];
        UIActivityViewController *activity = [[UIActivityViewController alloc] initWithActivityItems:@[localPath] applicationActivities:nil];
        UIActivityViewControllerCompletionHandler myBlock = ^(NSString *activityType,BOOL completed)
        {
            NSLog(@"调用分享的应用id :%@", activityType);
            if (completed)
            {
                NSLog(@"分享成功!");
            }
            else
            {
                NSLog(@"分享失败!");
            }
        };
        activity.completionHandler = myBlock;
        //    activity.completionWithItemsHandler = myBlock;

        if ([[UIDevice currentDevice].model isEqualToString:@"iPhone"]) {
            [self presentViewController:activity animated:YES completion:nil];
        }
        else if([[UIDevice currentDevice].model isEqualToString:@"iPad"])
        {
            UIPopoverPresentationController *popover = activity.popoverPresentationController;
            if (popover) {
                popover.sourceView = _shareB;
                popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
            }
            [self presentViewController:activity animated:YES completion:nil];
        }
        else
        {
            //do nothing
        }

}