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在iOS App Update上执行代码

[英]Execute code on iOS App Update

原文 2012-12-03 04:08:11 4 1 ios/ core-data

I have an iOS App that uses Core Data for storing some temporary data. 我有一个使用核心数据存储一些临时数据的iOS应用。 I have created an updated version of the app that I will soon be releasing on the App Store. 我已经创建了该应用程序的更新版本，并将很快在App Store上发布。 How do I execute a piece of code once user has updated the app? 用户更新应用后，如何执行一段代码？ Is there a callback method that is invoked after a user updates the app? 用户更新应用程序后是否有调用的回调方法？

I want to replace the schema of the existing data store with the newer one. 我想用较新的替换现有数据存储的架构。 I do not want to migrate any data. 我不想迁移任何数据。 Simply reset the data model & data when user updates the app. 用户更新应用程序时，只需重置数据模型和数据。 There's nothing critical stored in the database and it's okay to delete it. 数据库中没有存储关键数据，可以删除它。 Right now, when I update the app on a device it crashes. 现在，当我在设备上更新应用程序时，它崩溃了。 But when I uninstall the app and reinstall, it works. 但是，当我卸载该应用程序并重新安装时，它可以工作。 So how do I tell iOS, "Chuck whatever datamodel was there earlier and start with a fresh, new one!" 因此，我该如何告诉iOS，“删除之前存在的任何数据模型，并从一个全新的模型开始！”

1 个解决方案

on app start up you can check, if a certain key is inside your NSUserDefaults. 在应用启动时，您可以检查NSUserDefaults中是否有特定密钥。 if not, delete the database, and set something to this key. 如果不是，请删除数据库，然后为此键设置一些内容。