（iOS, Swift）十六进制字符串转(Hex)Data，Data转十六进制String Data,NSData,bytes[UInt8]互转 |
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（iOS, Swift）十六进制字符串转(Hex)Data，Data转十六进制String Data,NSData,bytes[UInt8]互转
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文章目录
1.十六进制String(字符串)转Data1.1 方法一（推荐）：1.2 方法二：
2.十六进制字符串转bytes[UInt8]3.bytes[UInt8]转十六进制字符串Hex3.1 自己的代码和示例示例代码
3.2 bytes[UInt8],Data,NSData转十六进制字符串，mac地址“AA:BB:CC:DD:EE:FF”3.2 可以用CryptoSwift框架中的数据转换方法
4.Data转十六进制String5.Data,NSData,bytes[UInt8]互转参考博客：
1.十六进制String(字符串)转Data
1.1 方法一（推荐）：
extension String {
/// Create `Data` from hexadecimal string representation
///
/// This takes a hexadecimal representation and creates a `Data` object. Note, if the string has any spaces or non-hex characters (e.g. starts with ''), those are ignored and only hex characters are processed.
///
/// - returns: Data represented by this hexadecimal string.
func hexadecimal() -> Data? {
var data = Data(capacity: self.count / 2)
let regex = try! NSRegularExpression(pattern: "[0-9a-f]{1,2}", options: .caseInsensitive)
regex.enumerateMatches(in: self, range: NSMakeRange(0, utf16.count)) { match, flags, stop in
let byteString = (self as NSString).substring(with: match!.range)
var num = UInt8(byteString, radix: 16)!
data.append(&num, count: 1)
}
guard data.count > 0 else { return nil }
return data
}
}
1.2 方法二：
//将十六进制字符串转化为 Data
func data(from hexStr: String) -> Data {
var hexStr1 = ""
if hexStr.count % 2 != 0 {
hexStr1 = "0" + hexStr
}else {
hexStr1 = hexStr
}
let bytes = self.bytes(from: hexStr1)
return Data(bytes: bytes)
}
2.十六进制字符串转bytes[UInt8]
// 将16进制字符串转化为 [UInt8]
// 使用的时候直接初始化出 Data
// Data(bytes: Array)
func bytes(from hexStr: String) -> [UInt8] {
// print("hexStr:\(hexStr)")
assert(hexStr.count % 2 == 0, "输入字符串格式不对，8位代表一个字符")
var bytes = [UInt8]()
var sum = 0
// 整形的 utf8 编码范围
let intRange = 48...57
// 小写 a~f 的 utf8 的编码范围
let lowercaseRange = 97...102
// 大写 A~F 的 utf8 的编码范围
let uppercasedRange = 65...70
for (index, c) in hexStr.utf8CString.enumerated() {
var intC = Int(c.byteSwapped)
if intC == 0 {
break
} else if intRange.contains(intC) {
intC -= 48
} else if lowercaseRange.contains(intC) {
intC -= 87
} else if uppercasedRange.contains(intC) {
intC -= 55
} else {
assertionFailure("输入字符串格式不对，每个字符都需要在0~9，a~f，A~F内")
}
sum = sum * 16 + intC
// 每两个十六进制字母代表8位，即一个字节
if index % 2 != 0 {
bytes.append(UInt8(sum))
sum = 0
}
}
// print(bytes)
print(bytes.count)
return bytes
}
3.bytes[UInt8]转十六进制字符串Hex
3.1 自己的代码和示例
示例
let bytes:[UInt8] = [0xff,0xaa,0xbb]
print(bytes)
print(bytes.toHexStr())
打印结果： [255, 170, 187] ff-aa-bb 代码 extension Data { //MARK: Data转十六进制字符串 /// Create hexadecimal string representation of `Data` object. /// /// - returns: `String` representation of this `Data` object. func hexadecimal() -> String { return map { String(format: "%02x", $0) } .joined(separator: "-") } } extension Array where Element == UInt8 { //MARK: bytes[UInt8]转十六进制字符串 /// Create hexadecimal string representation of `Data` object. /// /// - returns: `String` representation of this `Data` object. func toHexStr() -> String { let data:Data = Data.init(bytes: self) return data.hexadecimal() } } 3.2 bytes[UInt8],Data,NSData转十六进制字符串，mac地址“AA:BB:CC:DD:EE:FF” extension NSData { func macStr()->String { var bytes:[UInt8] = [UInt8](self as Data) bytes.removeFirst() bytes.removeFirst() var macStr = bytes.toHexStr() return macStr.uppercased() } } extension Data { /// Create hexadecimal string representation of `Data` object. /// /// - returns: `String` representation of this `Data` object. func macStr() -> String { return map { String(format: "%02x", $0) } .joined(separator: ":") } } extension Array where Element == UInt8 { //MARK: bytes[UInt8]转十六进制字符串 /// Create hexadecimal string representation of `Data` object. /// /// - returns: `String` representation of this `Data` object. func toHexStr() -> String { let data:Data = Data.init(bytes: self) return data.macStr() } } 3.2 可以用CryptoSwift框架中的数据转换方法数据加密和转换的框架： CryptoSwift - github
playground bytes: [UInt8] let data:Data = Data.init(bytes: bytes); let nsdata:NSData = NSData.init(bytes: bytes, length: bytes.count);data: Data let bytes: [UInt8] = [UInt8](data) let nsdata: NSData = NSData(data: data)nsdata: NSData let bytes: [UInt8] = [UInt8](nsdata as Data) let data: Data = nsdata as Data 参考博客：（iOS, Swift）十六进制转Data，十六进制转整形，Data转String swift 16进制String和Data相互转换 Swift中，把NSData转换为Byte数组的三种方法 |
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