iOS-现APP中的文档如何用第三方APP(WPS Office

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];