UIDocumentInteractionController的

<UIDocumentInteractionControllerDelegate>

@property (nonatomic,strong)UIDocumentInteractionController * document;

1.指定要分享的链接

 NSURL *URL = [[NSBundle mainBundle] URLForResource:@"ios-" withExtension:@"pdf"];      

 _document = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:cachesDir]];

2.设置分享代理

    _document.delegate    =  (id)self;

3.哪类文件支持第三方打开，这里不证明就代表所有文件！

//    _document.UTI = @"com.microsoft.word.doc";

4.判断手机中有没有应用可以打开该文件并打开分享界面

// 用户预览文件，如图1所示

//BOOL canOpen =   [_document presentPreviewAnimated:YES];

// 用户不预览文件直接分享，如图2所示

    BOOL canOpen = [self.document presentOpenInMenuFromRect:self.view.bounds inView:self.view animated:YES];

    if(!canOpen) {

   NSLog(@"沒有程序可以打开选中的文件");

    }

- (UIViewController*)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController*)controller{

    return self;

}

- (UIView*)documentInteractionControllerViewForPreview:(UIDocumentInteractionController*)controller {

    return self.view;

}

- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController*)controller {

    return self.view.frame;

}

//点击预览窗口的“Done”(完成)按钮时调用

- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController*)controller {

}

// 文件分享面板弹出的时候调用

- (void)documentInteractionControllerWillPresentOpenInMenu:(UIDocumentInteractionController*)controller{

    NSLog(@"WillPresentOpenInMenu");

}

// 当选择一个文件分享App的时候调用

- (void)documentInteractionController:(UIDocumentInteractionController*)controller willBeginSendingToApplication:(nullableNSString*)application{

    NSLog(@"begin send : %@", application);

}

// 弹框消失的时候走的方法

-(void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController*)controller{

    NSLog(@"dissMiss");

}