ios 在 Swift 中获取文件大小

Get file size in Swift

提问by Gralex

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

我尝试了几种方法来获取文件大小，但总是得到零。

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)")
}

I get in log: File size = nil

我进入日志： File size = nil

回答by Duyen-Hoa

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

在您的属性上使用attributesOfItemAtPath而不是attributesOfFileSystemForPath+ 调用 .fileSize()。

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();
}

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

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

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)")
}

In Swift 3.x/4.0:

在 Swift 3.x/4.0 中：

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)")
}

回答by gheclipse

Swift4: URL extension to easily access file attributes

Swift4：轻松访问文件属性的 URL 扩展

Extension:

延期：

extension URL {
    var attributes: [FileAttributeKey : Any]? {
        do {
            return try FileManager.default.attributesOfItem(atPath: path)
        } catch let error as NSError {
            print("FileAttribute error: \(error)")
        }
        return nil
    }

    var fileSize: UInt64 {
        return attributes?[.size] as? UInt64 ?? UInt64(0)
    }

    var fileSizeString: String {
        return ByteCountFormatter.string(fromByteCount: Int64(fileSize), countStyle: .file)
    }

    var creationDate: Date? {
        return attributes?[.creationDate] as? Date
    }
}

Usage:

用法：

let fileUrl: URL
print("file size = \(fileUrl.fileSize), \(fileUrl.fileSizeString)")

回答by Jerome

SWIFT 3come from @Hoa's answer and plus a function let UInt64 to readable String.

SWIFT 3来自@Hoa 的回答，加上一个函数让 UInt64 变为可读字符串。

func sizeForLocalFilePath(filePath:String) -> UInt64 {
    do {
        let fileAttributes = try FileManager.default.attributesOfItem(atPath: filePath)
        if let fileSize = fileAttributes[FileAttributeKey.size]  {
            return (fileSize as! NSNumber).uint64Value
        } else {
            print("Failed to get a size attribute from path: \(filePath)")
        }
    } catch {
        print("Failed to get file attributes for local path: \(filePath) with error: \(error)")
    }
    return 0
}
func covertToFileString(with size: UInt64) -> String {
    var convertedValue: Double = Double(size)
    var multiplyFactor = 0
    let tokens = ["bytes", "KB", "MB", "GB", "TB", "PB",  "EB",  "ZB", "YB"]
    while convertedValue > 1024 {
        convertedValue /= 1024
        multiplyFactor += 1
    }
    return String(format: "%4.2f %@", convertedValue, tokens[multiplyFactor])
}

回答by vadian

In Swift 3+ you can get the file size directly from the URL, (NS)FileManageris not needed. And ByteCountFormatteris a smart way to display the file size.

在 Swift 3+ 中，您可以直接从 URL 获取文件大小，(NS)FileManager不需要。并且ByteCountFormatter是一种显示文件大小的智能方式。

let url = Bundle.main.url(forResource:"movie", withExtension: "mov")!
do {
    let resourceValues = try url.resourceValues(forKeys: [.fileSizeKey])
    let fileSize = resourceValues.fileSize!
    print("File size = " + ByteCountFormatter().string(fromByteCount: Int64(fileSize)))
} catch { print(error) }

Actually you can get the file size from the URLeven in Swift 2 but the syntax is a bit more cumbersome.

实际上，您可以从URLSwift 2 中的even 中获取文件大小，但语法有点麻烦。

回答by Guy Brooker

Here is the answer from Biodave, with the correct file manager call

这是 Biodave 的答案，正确的文件管理器调用

func sizeForLocalFilePath(filePath:String) -> UInt64 {
    do {
        let fileAttributes = try NSFileManager.defaultManager().attributesOfItemAtPath(filePath)
        if let fileSize = fileAttributes[NSFileSize]  {
            return (fileSize as! NSNumber).unsignedLongLongValue
        } else {
            print("Failed to get a size attribute from path: \(filePath)")
        }
    } catch {
        print("Failed to get file attributes for local path: \(filePath) with error: \(error)")
    }
    return 0
}

For Swift 4.2:

对于 Swift 4.2：

func sizeForLocalFilePath(filePath:String) -> UInt64 {
    do {
        let fileAttributes = try FileManager.default.attributesOfItem(atPath: filePath)
        if let fileSize = fileAttributes[FileAttributeKey.size]  {
            return (fileSize as! NSNumber).uint64Value
        } else {
            print("Failed to get a size attribute from path: \(filePath)")
        }
    } catch {
        print("Failed to get file attributes for local path: \(filePath) with error: \(error)")
    }
    return 0
}

回答by Ahmed Lotfy

Swift 4 solution: This function return MB size.

Swift 4 解决方案：此函数返回 MB 大小。

func sizePerMB(url: URL?) -> Double {
    guard let filePath = url?.path else {
        return 0.0
    }
    do {
        let attribute = try FileManager.default.attributesOfItem(atPath: filePath)
        if let size = attribute[FileAttributeKey.size] as? NSNumber {
            return size.doubleValue / 1000000.0
        }
    } catch {
        print("Error: \(error)")
    }
    return 0.0
}

回答by abdullahselek

Here is another two different implementation with Swift 4, one is formatted in details and other one is formatted by decimal.

这是Swift 4 的另外两种不同的实现，一种是详细格式，另一种是十进制格式。

The one with NumberFomatter:

一个NumberFomatter：

func fileSize(fromPath path: String) -> String? {
    var size: Any?
    do {
        size = try FileManager.default.attributesOfItem(atPath: path)[FileAttributeKey.size]
    } catch (let error) {
        print("File size error: \(error)")
        return nil
    }
    guard let fileSize = size as? UInt64 else {
        return nil
    }

    let formatter = NumberFormatter()
    formatter.numberStyle = .decimal
    formatter.formatterBehavior = .behavior10_4
    return formatter.string(from: NSNumber(value: fileSize))
}

And the other one is defining with size units:

另一个是用尺寸单位定义：

func fileSize(fromPath path: String) -> String? {
    guard let size = try? FileManager.default.attributesOfItem(atPath: path)[FileAttributeKey.size],
        let fileSize = size as? UInt64 else {
        return nil
    }

    // bytes
    if fileSize < 1023 {
        return String(format: "%lu bytes", CUnsignedLong(fileSize))
    }
    // KB
    var floatSize = Float(fileSize / 1024)
    if floatSize < 1023 {
        return String(format: "%.1f KB", floatSize)
    }
    // MB
    floatSize = floatSize / 1024
    if floatSize < 1023 {
        return String(format: "%.1f MB", floatSize)
    }
    // GB
    floatSize = floatSize / 1024
    return String(format: "%.1f GB", floatSize)
}

回答by Programer_saeed

Try This.

尝试这个。

let MyUrl = NSURL(fileURLWithPath: "*** Custom File Path ***")                  
let fileAttributes = try! NSFileManager.defaultManager().attributesOfItemAtPath(MyUrl.path!)
let fileSizeNumber = fileAttributes[NSFileSize] as! NSNumber
let fileSize = fileSizeNumber.longLongValue
var sizeMB = Double(fileSize / 1024)
sizeMB = Double(sizeMB / 1024)
print(String(format: "%.2f", sizeMB) + " MB")

回答by boherna

URL extension in Swift to get the file size, if any.

Swift 中的 URL 扩展以获取文件大小（如果有）。

public extension URL {

    var fileSize: Int? {
        let value = try? resourceValues(forKeys: [.fileSizeKey])
        return value?.fileSize
    }
}

The reason for returning an optional Int is because an unknown file size cannot be considered as having a zero size.

返回可选 Int 的原因是因为未知文件大小不能被视为具有零大小。

回答by Jonny

Inspiration from a few other answers.

灵感来自其他一些答案。

extension URL {
    var filesize: Int? {
        let set = Set.init([URLResourceKey.fileSizeKey])
        var filesize: Int?      
        do {
            let values = try self.resourceValues(forKeys: set)
            if let theFileSize = values.fileSize {
                filesize = theFileSize
            }
        }
        catch {
            print("Error: \(error)")
        }
        return filesize
    }

    var filesizeNicelyformatted: String? {
        guard let fileSize = self.filesize else {
            return nil
        }
        return ByteCountFormatter.init().string(fromByteCount: Int64(fileSize))
    }
}