convert NSData Length from bytes to megs

Question

I am trying to NSLog the number of megs my NSData object is however currently all I can get is bytes by using

NSLog(@\"%u\", myData.le         


        

Answer 1

With Swift 5.1 and iOS 13, you can use one of the 5 following ways to solve your problem.

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#1. Using ByteCountFormatter's string(fromByteCount:countStyle:) class method

The following sample code shows how to implement string(fromByteCount:countStyle:) in order to print a file size by automatically converting bytes to a more appropriate storage unit (e.g. megabytes):

import Foundation

let url = Bundle.main.url(forResource: "image", withExtension: "png")!
let data = try! Data(contentsOf: url)

let byteCount = data.count
print(byteCount) // prints: 2636725

let displaySize = ByteCountFormatter.string(fromByteCount: Int64(byteCount), countStyle: .file)
print(displaySize) // prints: 2.6 MB

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#2. Using ByteCountFormatter's string(fromByteCount:) method

The following sample code shows how to implement ByteCountFormatter's string(fromByteCount:) in order to print a file size by manually converting bytes to megabytes:

import Foundation

let url = Bundle.main.url(forResource: "image", withExtension: "png")!
let data = try! Data(contentsOf: url)

let byteCount = data.count
print(byteCount) // prints: 2636725

let formatter = ByteCountFormatter()
formatter.allowedUnits = [.useMB]
formatter.countStyle = .file
let displaySize = formatter.string(fromByteCount: Int64(byteCount))
print(displaySize) // prints: 2.6 MB

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#3. Using ByteCountFormatter's string(from:countStyle:) class method and Measurement

The following sample code shows how to implement string(from:countStyle:) in order to print a file size by automatically converting bytes to a more appropriate storage unit (e.g. megabytes):

import Foundation

let url = Bundle.main.url(forResource: "image", withExtension: "png")!
let data = try! Data(contentsOf: url)

let byteCount = data.count
print(byteCount) // prints: 2636725

let byteSize = Measurement(value: Double(byteCount), unit: UnitInformationStorage.bytes)
let displaySize = ByteCountFormatter.string(from: byteSize, countStyle: .file)
print(displaySize) // prints: 2.6 MB

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#4. Using ByteCountFormatter's string(from:) method and Measurement

The following sample code shows how to implement ByteCountFormatter's string(from:) and Measurement in order to print a file size by manually converting bytes to megabytes:

import Foundation

let url = Bundle.main.url(forResource: "image", withExtension: "png")!
let data = try! Data(contentsOf: url)

let byteCount = data.count
print(byteCount) // prints: 2636725

let byteSize = Measurement(value: Double(byteCount), unit: UnitInformationStorage.bytes)
let formatter = ByteCountFormatter()
formatter.allowedUnits = [.useMB]
formatter.countStyle = .file
let displaySize = formatter.string(from: byteSize)
print(displaySize) // prints: 2.6 MB

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#5. Using MeasurementFormatter's string(from:) method and Measurement

The following sample code shows how to implement Measurement and MeasurementFormatter's string(from:) in order to print a file size by manually converting bytes to megabytes:

import Foundation

let url = Bundle.main.url(forResource: "image", withExtension: "png")!
let data = try! Data(contentsOf: url)

let byteCount = data.count
print(byteCount) // prints: 2636725

let byteSize = Measurement(value: Double(byteCount), unit: UnitInformationStorage.bytes)
let convertedSize = byteSize.converted(to: .megabytes)
let formatter = MeasurementFormatter()
let displaySize = formatter.string(from: convertedSize)
print(displaySize) // prints: 2.637 MB