如何显示在iOS中复制大文件的进度？ [英] How to show the progress of copying a large file in iOS?

问题描述

我在写一个iOS应用程序。在我的应用程序，我想将一些文件从一个文件夹复制到另一个。
但是因为一些文件太大，需要很长时间才能完成复制。所以我想添加一个进度条来显示副本的百分比。但我发现文件管理器没有回调方法来获取百分比。

解决方案

在高级别：

运行另一个线程（T2），该线程周期性地（例如每100ms）读取一个目标文件 current_size 。

计算百分比： current_size / total_size

更新您的进度栏ui element

I am writing an iOS app. In my app, I want to copy some files from one folder to another. But because some files is too large, it will take a long time to finish the copy. So I want to add a progress bar to show the percentage of the copy. But I find that the file manager has no callback method to get the percentage. Does anyone have the good solution to it?

解决方案

In high level :

1. Run your copying process in a seperate thread (T1)
2. Run another thread (T2) which reads periodically (say every 100ms) the destination file current_size.
3. Calculate the percentage : current_size / total_size
4. Update you progress bar ui element

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