如何在Swift中将字符串编码为Base64?
我想将字符串转换为Base64。我在好几个地方找到了答案,但在Swift中它已经不起作用了。我使用的是Xcode 6.2。我相信答案可能是在以前的Xcode版本中工作,而不是Xcode 6.2 有人能指导我在Xcode 6.2中这样做吗 我找到的答案是这样的,但它在我的Xcode版本中不起作用:如何在Swift中将字符串编码为Base64?,swift,base64,Swift,Base64,我想将字符串转换为Base64。我在好几个地方找到了答案,但在Swift中它已经不起作用了。我使用的是Xcode 6.2。我相信答案可能是在以前的Xcode版本中工作,而不是Xcode 6.2 有人能指导我在Xcode 6.2中这样做吗 我找到的答案是这样的,但它在我的Xcode版本中不起作用: var str = "iOS Developer Tips encoded in Base64" println("Original: \(str)") // UTF 8 str from origi
var str = "iOS Developer Tips encoded in Base64"
println("Original: \(str)")
// UTF 8 str from original
// NSData! type returned (optional)
let utf8str = str.dataUsingEncoding(NSUTF8StringEncoding)
// Base64 encode UTF 8 string
// fromRaw(0) is equivalent to objc 'base64EncodedStringWithOptions:0'
// Notice the unwrapping given the NSData! optional
// NSString! returned (optional)
let base64Encoded = utf8str.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
println("Encoded: \(base64Encoded)")
// Base64 Decode (go back the other way)
// Notice the unwrapping given the NSString! optional
// NSData returned
let data = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions.fromRaw(0)!)
// Convert back to a string
let base64Decoded = NSString(data: data, encoding: NSUTF8StringEncoding)
println("Decoded: \(base64Decoded)")
参考:我没有安装6.2,但我认为6.3在这方面没有任何不同:
dataUsingEncoding
返回一个可选值,因此需要将其展开
nsdatabase64编码选项。fromRaw
已替换为nsdatabase64编码选项(rawValue:)
。稍微令人惊讶的是,这不是一个失败的初始值设定项,所以您不需要打开它
但是由于NSData(base64EncodedString:)
是一个可失败的初始值设定项,因此需要将其展开
顺便说一句,所有这些更改都是由Xcode migrator建议的(单击排水沟中的错误消息,它有一个“修复”建议)
为避免强制展开而重写的最终代码如下所示:
import Foundation
let str = "iOS Developer Tips encoded in Base64"
println("Original: \(str)")
let utf8str = str.dataUsingEncoding(NSUTF8StringEncoding)
if let base64Encoded = utf8str?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
{
println("Encoded: \(base64Encoded)")
if let base64Decoded = NSData(base64EncodedString: base64Encoded, options: NSDataBase64DecodingOptions(rawValue: 0))
.map({ NSString(data: $0, encoding: NSUTF8StringEncoding) })
{
// Convert back to a string
println("Decoded: \(base64Decoded)")
}
}
(如果使用Swift 1.2,您可以使用多个if let而不是地图)
Swift 5更新:
import Foundation
let str = "iOS Developer Tips encoded in Base64"
print("Original: \(str)")
let utf8str = str.data(using: .utf8)
if let base64Encoded = utf8str?.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0)) {
print("Encoded: \(base64Encoded)")
if let base64Decoded = Data(base64Encoded: base64Encoded, options: Data.Base64DecodingOptions(rawValue: 0))
.map({ String(data: $0, encoding: .utf8) }) {
// Convert back to a string
print("Decoded: \(base64Decoded ?? "")")
}
}
(完全公开:我写的)是一个本机Swift Base64编码(无解码库。使用它,您可以对标准Base64进行编码:
let bytesToEncode : [UInt8] = [1,2,3]
let base64EncodedString = SwiftyBase64.EncodeString(bytesToEncode)
或URL和文件名安全Base64:
let bytesToEncode : [UInt8] = [1,2,3]
let base64EncodedString = SwiftyBase64.EncodeString(bytesToEncode, alphabet:.URLAndFilenameSafe)
您可以只做一个简单的扩展,如:
import UIKit
// MARK: - Mixed string utils and helpers
extension String {
/**
Encode a String to Base64
:returns:
*/
func toBase64()->String{
let data = self.dataUsingEncoding(NSUTF8StringEncoding)
return data!.base64EncodedStringWithOptions(NSDataBase64EncodingOptions(rawValue: 0))
}
}
iOS 7及以上版本经过深入研究,我找到了解决方案 编码
let plainData = (plainString as NSString).dataUsingEncoding(NSUTF8StringEncoding)
let base64String =plainData.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.fromRaw(0)!)
println(base64String) // bXkgcGxhbmkgdGV4dA==
解码
let decodedData = NSData(base64EncodedString: base64String, options:NSDataBase64DecodingOptions.fromRaw(0)!)
let decodedString = NSString(data: decodedData, encoding: NSUTF8StringEncoding)
println(decodedString) // my plain data
更多关于此的信息Swift
import Foundation
extension String {
func fromBase64() -> String? {
guard let data = Data(base64Encoded: self) else {
return nil
}
return String(data: data, encoding: .utf8)
}
func toBase64() -> String {
return Data(self.utf8).base64EncodedString()
}
}
毕竟我是这样做的
func conversion(str:NSString)
{
if let decodedData = NSData(base64EncodedString: str as String, options:NSDataBase64DecodingOptions(rawValue: 0)),
let decodedString = NSString(data: decodedData, encoding: NSUTF8StringEncoding) {
print(decodedString)//Here we are getting decoded string
在调用另一个函数将解码字符串转换为字典之后
self .convertStringToDictionary(decodedString as String)
}
}//function close
func convertStringToDictionary(text: String) -> [String:AnyObject]? {
if let data = text.dataUsingEncoding(NSUTF8StringEncoding) {
do {
let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? [String:AnyObject]
print(json)
if let stack = json!["cid"] //getting key value here
{
customerID = stack as! String
print(customerID)
}
} catch let error as NSError {
print(error)
}
}
return nil
}
//将字符串转换为字典
self .convertStringToDictionary(decodedString as String)
}
}//function close
func convertStringToDictionary(text: String) -> [String:AnyObject]? {
if let data = text.dataUsingEncoding(NSUTF8StringEncoding) {
do {
let json = try NSJSONSerialization.JSONObjectWithData(data, options: []) as? [String:AnyObject]
print(json)
if let stack = json!["cid"] //getting key value here
{
customerID = stack as! String
print(customerID)
}
} catch let error as NSError {
print(error)
}
}
return nil
}
@Swift 2.0中的空速响应:
let str = "iOS Developer Tips encoded in Base64"
print("Original: \(str)")
let base64Encoded = str.dataUsingEncoding(NSUTF8StringEncoding)!.base64EncodedStringWithOptions([])
print("Encoded: \(base64Encoded)")
let base64DecodedData = NSData(base64EncodedString: base64Encoded, options: [])!
var base64DecodedString = String(data: base64DecodedData, encoding: NSUTF8StringEncoding)!
print("Decoded: \(base64DecodedString)")
Swift 3或4
let base64Encoded = Data("original string".utf8).base64EncodedString()
Swift 3/4/5.1 这里是一个简单的
字符串
扩展,允许在解码时出错时保留选项
extension String {
/// Encode a String to Base64
func toBase64() -> String {
return Data(self.utf8).base64EncodedString()
}
/// Decode a String from Base64. Returns nil if unsuccessful.
func fromBase64() -> String? {
guard let data = Data(base64Encoded: self) else { return nil }
return String(data: data, encoding: .utf8)
}
}
例如:
let testString = "A test string."
let encoded = testString.toBase64() // "QSB0ZXN0IHN0cmluZy4="
guard let decoded = encoded.fromBase64() // "A test string."
else { return }
适用于SWIFT 3.0
let str = "iOS Developer Tips encoded in Base64"
print("Original: \(str)")
let utf8str = str.data(using: String.Encoding.utf8)
if let base64Encoded = utf8str?.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))
{
print("Encoded: \(base64Encoded)")
if let base64Decoded = NSData(base64Encoded: base64Encoded, options: NSData.Base64DecodingOptions(rawValue: 0))
.map({ NSString(data: $0 as Data, encoding: String.Encoding.utf8.rawValue) })
{
// Convert back to a string
print("Decoded: \(base64Decoded)!")
}
}
Xcode 11.4•Swift 5.2或更高版本
extension StringProtocol {
var data: Data { Data(utf8) }
var base64Encoded: Data { data.base64EncodedData() }
var base64Decoded: Data? { Data(base64Encoded: string) }
}
Swift 4.0.3
import UIKit
extension String {
func fromBase64() -> String? {
guard let data = Data(base64Encoded: self, options: Data.Base64DecodingOptions(rawValue: 0)) else {
return nil
}
return String(data: data as Data, encoding: String.Encoding.utf8)
}
func toBase64() -> String? {
guard let data = self.data(using: String.Encoding.utf8) else {
return nil
}
return data.base64EncodedString(options: Data.Base64EncodingOptions(rawValue: 0))
}
}
Swift 4.2
"abcd1234".data(using: .utf8)?.base64EncodedString()
Swift 4.2
var base64String = "my fancy string".data(using: .utf8, allowLossyConversion: false)?.base64EncodedString()
要解码,请参阅(从)
Swift 5.1,Xcode 11:
public extension String {
/// Assuming the current string is base64 encoded, this property returns a String
/// initialized by converting the current string into Unicode characters, encoded to
/// utf8. If the current string is not base64 encoded, nil is returned instead.
var base64Decoded: String? {
guard let base64 = Data(base64Encoded: self) else { return nil }
let utf8 = String(data: base64, encoding: .utf8)
return utf8
}
/// Returns a base64 representation of the current string, or nil if the
/// operation fails.
var base64Encoded: String? {
let utf8 = self.data(using: .utf8)
let base64 = utf8?.base64EncodedString()
return base64
}
}
您不能只执行
[]
而不执行NSDatabase64编码选项(rawValue:0)
吗?是的,您可以;我刚刚测试了它。[]
是默认值,因此您可以只调用函数而不传入任何参数:utf8str?.base64encodestring()
这是安全代码,您需要处理选项。添加了Swift 3 SyntaxI尝试转换此基本64字符串:dfYcSGpvBqyzvkAXkdbHDA==
,预期输出必须是:u�Hjo���@���代码>但上面的函数返回nil。您可以在以下站点上检查上述base-64字符串的输出:,@ZaidPathan,已修复!Swift扩展名干净方便。我使用相同的代码,但编译器仍给出错误:“Data”类型的值在Swift 4.0.3中没有成员“base64EncodedStringWithOptions”,带有数据(self.utf8)。base64EncodedString()
toBase64()不需要可选选项。下面的答案:页面上的最佳答案,因为它是更新的,返回非可选的,并且不会将如此简单的操作包装在扩展中。它总是返回nil。请您帮忙。这非常有效,非常简洁的代码,帮助很大。
//: # Swift 3: Base64 encoding and decoding
import Foundation
extension String {
//: ### Base64 encoding a string
func base64Encoded() -> String? {
if let data = self.data(using: .utf8) {
return data.base64EncodedString()
}
return nil
}
//: ### Base64 decoding a string
func base64Decoded() -> String? {
if let data = Data(base64Encoded: self) {
return String(data: data, encoding: .utf8)
}
return nil
}
}
var str = "Hello, playground"
print("Original string: \"\(str)\"")
if let base64Str = str.base64Encoded() {
print("Base64 encoded string: \"\(base64Str)\"")
if let trs = base64Str.base64Decoded() {
print("Base64 decoded string: \"\(trs)\"")
print("Check if base64 decoded string equals the original string: \(str == trs)")
}
}
public extension String {
/// Assuming the current string is base64 encoded, this property returns a String
/// initialized by converting the current string into Unicode characters, encoded to
/// utf8. If the current string is not base64 encoded, nil is returned instead.
var base64Decoded: String? {
guard let base64 = Data(base64Encoded: self) else { return nil }
let utf8 = String(data: base64, encoding: .utf8)
return utf8
}
/// Returns a base64 representation of the current string, or nil if the
/// operation fails.
var base64Encoded: String? {
let utf8 = self.data(using: .utf8)
let base64 = utf8?.base64EncodedString()
return base64
}
}