1、首先实现代理UIDocumentInteractionControllerDelegate
2、定义属性
@property (nonatomic, strong) UIDocumentInteractionController *documentInteractionController;
3、在需要用第三方查看文档的地方如下代码
注：必须是本地文件
//str是要打开的文档路径
NSURL *url = [NSURL fileURLWithPath:str];
_documentInteractionController = [UIDocumentInteractionController
interactionControllerWithURL:url];
[_documentInteractionController setDelegate:self];
[_documentInteractionController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
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