[英]NSData to String in Swift Issues
I'm having issues converting my NSData to NSString in swift. 我在swift中将NSData转换为NSString时遇到问题。 I'm using what I think is the correct command and format:
NSString(data: <DATA>, encoding: <ENCODING>)
however whatever I do i keep ending up with a nil value. 我正在使用我认为正确的命令和格式:
NSString(data: <DATA>, encoding: <ENCODING>)
然而无论我做什么,我都会以nil值结束。 I am running the latest Xcode beta so I'm not sure if that is related but I'm hoping its a simple easy error that I've run into. 我正在运行最新的Xcode测试版,所以我不确定这是否相关,但我希望这是一个简单的错误,我遇到了。
I've attached playground code as well as a screen capture. 我附上了游乐场代码和屏幕截图。
import Foundation
//: # NSData to String Conversion Playground
//: ### Step 1
//: The first step is to take an array of bytes and conver them into a NSData object. The bytes are as follows:
var testBytes : [UInt8] = [0x14, 0x00, 0xAB, 0x45, 0x49, 0x1F, 0xEF, 0x15, 0xA8, 0x89, 0x78, 0x0F, 0x09, 0xA9, 0x07, 0xB0, 0x01, 0x20, 0x01, 0x4E, 0x38, 0x32, 0x35, 0x56, 0x20, 0x20, 0x20, 0x00]
//: ### Step 2
//: Convert the byte array into an **NSData** Object
var immutableData = NSData(bytes: testBytes, length: testBytes.count)
//: ### Step 3
//: Attempt to convert the **NSData** object into a string so it can be sent around as ascii. This for some reason seems to be failing, however.
var convertedString = NSString(data: immutableData, encoding: NSUTF8StringEncoding)
println("String = \(convertedString)")
let testBytes : [UInt8] = [0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64]
func bytes2String(array:[UInt8]) -> String {
return String(data: NSData(bytes: array, length: array.count), encoding: NSUTF8StringEncoding) ?? ""
}
Xcode 8.2 • Swift 3.0.2 Xcode 8.2•Swift 3.0.2
func bytes2String(_ array: [UInt8]) -> String {
return String(data: Data(bytes: array, count: array.count), encoding: .utf8) ?? ""
}
Testing: 测试:
bytes2String(testBytes) // "Hello World"
Use valid UTF8 characters! 使用有效的UTF8字符!
// Playground - noun: a place where people can play
import UIKit
var str = "Hello, playground"
import Foundation
//: # NSData to String Conversion Playground
//: ### Step 1
//: The first step is to take an array of bytes and conver them into a NSData object. The bytes are as follows:
// Hello World
var testBytes : [UInt8] = [0x48, 0x65, 0x6C, 0x6C, 0x6F, 0x20, 0x57, 0x6F, 0x72, 0x6C, 0x64]
//: ### Step 2
//: Convert the byte array into an **NSData** Object
var immutableData = NSData(bytes: testBytes, length: testBytes.count)
//: ### Step 3
//: Attempt to convert the **NSData** object into a string so it can be sent around as ascii. This for some reason seems to be failing, however.
var convertedString = NSString(data: immutableData, encoding: NSUTF8StringEncoding)
println("String = \(convertedString)")
Your output will be: "String = Optional(Hello World)"
您的输出将是:
"String = Optional(Hello World)"
If you just want hex values in string: 如果您只想在字符串中使用十六进制值:
I just want a string of the hex values.
我只想要一个十六进制值的字符串。 I guess this is trying to decode as actual ascii!
我想这是尝试解码为实际的ascii! Duh!!
咄! – Jeef Mar 4 at 23:29
- Jeef 3月4日23:29
The easiest way to do this is just use Swifts built in string interpolation. 最简单的方法是使用内置字符串插值的Swifts。
let myHexString = "\(myNSDataObject)"
This will give you a string of hex with spaces between each two characters and surrounded by square brackets. 这将为您提供一个十六进制字符串,每两个字符之间有空格,并用方括号括起来。 Like this:
像这样:
<a0 ff 21 4a>
You could format it with using the built in string methods: 您可以使用内置的字符串方法对其进行格式化:
myHexString.stringByTrimmingCharactersInSet(NSCharacterSet(charactersInString: "<>")).stringByReplacingOccurrencesOfString(" ", withString: "")
You will have then have a string containing: a0ff214a 然后,您将拥有一个包含以下内容的字符串:a0ff214a
Using UTF8 in Swift 3.0 在Swift 3.0中使用UTF8
let testBytes : [UInt8] = [0x14, 0x00, 0xAB, 0x45, 0x49, 0x1F, 0xEF, 0x15, 0xA8, 0x89, 0x78, 0x0F, 0x09, 0xA9, 0x07, 0xB0, 0x01, 0x20, 0x01, 0x4E, 0x38, 0x32, 0x35, 0x56, 0x20, 0x20, 0x20, 0x00]
let immutableData = NSData(bytes: testBytes, length: testBytes.count)
let convertedString = NSString(data: (immutableData as NSData) as Data, encoding:String.Encoding.utf8.rawValue)
print("String = \(convertedString)")
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