使用系统控件UIDocumentInteractionController对多种格式的文件进行预览，或分享等的操作。

// 获取文件路径

NSURL *url = [[NSBundle mainBundle] URLForResource:@"read" withExtension:@"txt"];
// 或
NSString *filePath = [[NSBundle mainBundle] pathForResource:@"performanceOptimization" ofType:@"pdf"];
NSURL *url = [NSURL fileURLWithPath:filePath]; // 注意：使用[NSURL URLWithString:filePath]无效

// 实例化UIDocumentInteractionController

UIDocumentInteractionController *documentController = [UIDocumentInteractionController interactionControllerWithURL:url];
documentController.delegate = self;

// 文件操作

// 1 预览
[documentController presentPreviewAnimated:YES]; // 预览文件

// 2 分享等
[documentController presentOptionsMenuFromRect:self.view.bounds inView:self.view animated:YES]; // 菜单操作

// 实现代理，添加协议 UIDocumentInteractionControllerDelegate

- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller canPerformAction:(nullable SEL)action
{
    // 响应方法
    NSLog(@"12 %s", __func__);
    return YES;
}
 
- (BOOL)documentInteractionController:(UIDocumentInteractionController *)controller performAction:(nullable SEL)action
{
    //
    NSLog(@"13 %s", __func__);
    return YES;
}
 
- (void)documentInteractionControllerWillPresentOptionsMenu:(UIDocumentInteractionController *)controller
{
    // 页面显示后响应
    NSLog(@"9 %s", __func__);
}
 
- (void)documentInteractionControllerDidDismissOptionsMenu:(UIDocumentInteractionController *)controller
{
    // 取消时响应
    NSLog(@"10 %s", __func__);
}
 
- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller
{
    NSLog(@"1 %s", __func__);
    return self;
}
 
- (UIView *)documentInteractionControllerViewForPreview:(UIDocumentInteractionController *)controller
{
    NSLog(@"2 %s", __func__);
    return self.view;
}
 
- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController *)controller
{
    NSLog(@"3 %s", __func__);
    return self.view.frame;
}
 
// 文件分享面板退出时调用
- (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller
{
    NSLog(@"4 %s", __func__);
    NSLog(@"dismiss");
}
 
// 文件分享面板弹出的时候调用
- (void)documentInteractionControllerWillPresentOpenInMenu:(UIDocumentInteractionController *)controller
{
    NSLog(@"5 %s", __func__);
    NSLog(@"WillPresentOpenInMenu");
}
 
// 当选择一个文件分享App的时候调用
- (void)documentInteractionController:(UIDocumentInteractionController *)controller willBeginSendingToApplication:(nullable NSString *)application
{
    NSLog(@"6 %s", __func__);
    NSLog(@"begin send : %@", application);
}
 
// Preview presented/dismissed on document.  Use to set up any HI underneath.
- (void)documentInteractionControllerWillBeginPreview:(UIDocumentInteractionController *)controller
{
    NSLog(@"7 %s", __func__);
}
- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller
{
    // 完成时响应
    NSLog(@"8 %s", __func__);
}
 
- (void)documentInteractionController:(UIDocumentInteractionController *)controller didEndSendingToApplication:(nullable NSString *)application
{
    NSLog(@"11 %s", __func__);
}

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https://blog.csdn.net/potato512/article/details/80177009
http://blog.sina.com.cn/s/blog_bc3421b10101a357.html
http://www.360doc.com/content/16/0128/19/8772388_531302460.shtml
https://www.jianshu.com/p/c9484a4e9fc8