文件预览之UIDocumentInteractionController使用

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最近做到一个小功能，需要实现Word、Excel、PDF在线预览，然后百度找到了解决方法，对哦，就是用的UIDocumentInteractionController，说实话需要用到在线预览的地方很少，但是遇到了不会弄那也只有GG了

先来两段瞅瞅
这里要这样

@interface ViewController ()
@property(nonatomic,strong) UIDocumentInteractionController *documentController;
@end
@implementation ViewController
//直接预览
- (IBAction)pdfAction:(UIButton *)sender {
  
  
    _documentController = [UIDocumentInteractionController interactionControllerWithURL:  [[NSBundle mainBundle] URLForResource:@"Steve" withExtension:@"pdf"]];
    _documentController.delegate = self;
    //当前APP打开  需实现协议方法才可以完成预览功能
    [_documentController presentPreviewAnimated:YES];

}
//使用第三方
- (IBAction)openClick:(UIButton *)sender {
    _documentController = [UIDocumentInteractionController interactionControllerWithURL:  [[NSBundle mainBundle] URLForResource:@"Steve" withExtension:@"pdf"]];
    _documentController.delegate = self;
    
    //第三方打开 手机中安装有可以打开此格式的软件都可以打开/
    //[_documentController presentOpenInMenuFromRect:self.view.bounds inView:self.view animated:YES];
    //使用AirDrop
    [self presentOptionsMenu];

}

-(void)presentOptionsMenu{
    
    [_documentController presentOptionsMenuFromRect:self.view.bounds inView:self.view animated:YES];
}
#pragma mark UIDocumentInteractionControllerDelegate
-(UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller{
    
    //注意：此处要求的控制器，必须是它的页面view，已经显示在window之上了
    return self;
    
}

代码很简单，做个笔记以防忘记