iOS

Question

我想在开始时创建预种子数据库文件很大 (5mb)。

我用copyItemAtPath复制文件，请问这个方法有补全吗？我怎么知道这个过程何时完成？

Answer 1

这段代码就够了：

do {
    // copy files from main bundle to documents directory
    print("copy")
    try 
        NSFileManager.defaultManager().copyItemAtPath(sourcePath, toPath: destinationPath)
} catch let error as NSError {
     // Catch fires here, with an NSError being thrown
     print("error occurred, here are the details:\n \(error)")
}

destinationPath 可以是例如：

NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, .UserDomainMask, true).first

Answer 2

来自How to show the progress of copying a large file in iOS?

Run your copying process in a seperate thread (T1)

Run another thread (T2) which reads periodically (say every 100ms) the destination file current_size.

Calculate the percentage to display progress: current_size / total_size

iOS - Swift 我如何知道 copyItemAtPath 何时完成？

iOS - Swift How do i know when copyItemAtPath has been finished?

nsfilemanager

swift