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ios在我自己的应用程序中打开第三方应用程序

[英]ios open third party app within my own app

I am new to ios.In my app we have documents like PDF,.DOC if we click that document means it will check wheather any third party app is installed in device or not.if any app installed (Ex.PDF Reader)the document is open that app.After opening the document suppose if user close the app i want to navigate to my APP 我是ios的新手。在我的应用中,我们有PDF,.DOC之类的文档,如果单击该文档,则它将检查是否已在设备中安装了任何第三方应用。是否已安装了任何应用(例如PDF阅读器)打开该应用程序。打开文档后,假设用户关闭该应用程序,我想导航到我的APP

How to do that? 怎么做?

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