iOS调用系统的分享的两种方式

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两种方案各有各的好处，具体使用细节可运行demo后查看，源码有两个文件

1、ViewController.h

#import 

@interface ViewController : UIViewController

@property (weak, nonatomic) IBOutlet UIButton *openIn;
@property (weak, nonatomic) IBOutlet UIButton *shareIn;
@property (nonatomic,strong) UIDocumentInteractionController *documentInteractionController;

@end

2、ViewController.m

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (IBAction)openIn:(UIButton *)sender {
    NSString *localPath = [[NSBundle mainBundle] pathForResource:@"1" 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;
}

- (IBAction)shareIn:(UIButton *)sender {
    NSString *localPath = [[NSBundle mainBundle] pathForResource:@"1" 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;

    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 = self.shareIn;
            popover.permittedArrowDirections = UIPopoverArrowDirectionUp;
        }
        [self presentViewController:activity animated:YES completion:nil];
    }
    else
    {
        //do nothing
    }
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end