在Swift中获取文件大小 [英] Get file size in Swift

问题描述

我尝试了几种获取文件大小的方法，但总是得到零。

I tried several method to get file size, but always get zero.

let path = NSBundle.mainBundle().pathForResource("movie", ofType: "mov")
let attr = NSFileManager.defaultManager().attributesOfFileSystemForPath(path!, error: nil)
if let attr = attr {
    let size: AnyObject? = attr[NSFileSize]
    println("File size = \(size)")
}

我进入日志：文件大小= nil

推荐答案

使用 attributesOfItemAtPath 而不是 attributesOfFileSystemForPath
+在你的attr上调用.fileSize（）。

Use attributesOfItemAtPath instead of attributesOfFileSystemForPath + call .fileSize() on your attr.

var filePath: NSString = "your path here"
var fileSize : UInt64
var attr:NSDictionary? = NSFileManager.defaultManager().attributesOfItemAtPath(filePath, error: nil)
if let _attr = attr {
    fileSize = _attr.fileSize();
}

在Swift 2.0中，我们使用do try catch pattern，如下所示：

In Swift 2.0, we use do try catch pattern, like this:

let filePath = "your path here"
var fileSize : UInt64 = 0

do {
    let attr : NSDictionary? = try NSFileManager.defaultManager().attributesOfItemAtPath(filePath)

    if let _attr = attr {
        fileSize = _attr.fileSize();
    }
} catch {
    print("Error: \(error)")
}

在Swift 3.x / 4.0中：

In Swift 3.x/4.0:

let filePath = "your path here"
var fileSize : UInt64

do {
    //return [FileAttributeKey : Any]
    let attr = try FileManager.default.attributesOfItem(atPath: filePath)
    fileSize = attr[FileAttributeKey.size] as! UInt64

    //if you convert to NSDictionary, you can get file size old way as well.
    let dict = attr as NSDictionary
    fileSize = dict.fileSize()
} catch {
    print("Error: \(error)")
}

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