String+Extension.swift
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//
// String+Extension.swift
// metaCode
//
// Created by zx on 2023/10/16.
//
import UIKit
import CommonCrypto
extension String {
/// Calculate text's height from `width` and `front`.
func calculateHeightWith(width: CGFloat, font: UIFont)-> CGFloat {
let attr = [NSAttributedString.Key.font: font]
let maxSize: CGSize = CGSize(width: width, height: CGFloat(MAXFLOAT))
let option = NSStringDrawingOptions.usesLineFragmentOrigin
return self.boundingRect(with: (maxSize), options: option, attributes: attr, context: nil).size.height
}
//截取子字符串,eg "123456" start:2为第三位,length:3为长度是3,substring:345
func subString(start: Int, length: Int) -> String {
let startIndex = self.index(self.startIndex, offsetBy: start)
let endIndex = self.index(startIndex, offsetBy: length)
let substring = self[startIndex..<endIndex]
return String(substring)
}
//加密
func crypt(operation:CCOperation, key: String) -> String? {
if let keyData = key.data(using: .utf8) {
var cryptData: Data?
if operation == kCCEncrypt {
cryptData = self.data(using: .utf8)
} else {
cryptData = Data(base64Encoded: self, options: .ignoreUnknownCharacters)
}
if cryptData == nil {
return nil
}
let algoritm: CCAlgorithm = CCAlgorithm(kCCAlgorithmDES)
let option: CCOptions = CCOptions(kCCOptionPKCS7Padding)
let keyBytes = [UInt8](keyData)
let keyLength = kCCKeySizeDES
let dataIn = [UInt8](cryptData!)
let dataInlength = cryptData!.count
let dataOutAvailable = Int(dataInlength + kCCBlockSizeDES)
let dataOut = UnsafeMutablePointer<UInt8>.allocate(capacity: dataOutAvailable)
let dataOutMoved = UnsafeMutablePointer<Int>.allocate(capacity: 1)
dataOutMoved.initialize(to: 0)
let cryptStatus = CCCrypt(operation, algoritm, option, keyBytes, keyLength, keyBytes, dataIn, dataInlength, dataOut, dataOutAvailable, dataOutMoved)
var data: Data?
if CCStatus(cryptStatus) == CCStatus(kCCSuccess) {
data = Data(bytesNoCopy: dataOut, count: dataOutMoved.pointee, deallocator: .none)
}
dataOutMoved.deallocate()
dataOut.deallocate()
if data == nil {
return nil
}
if operation == kCCEncrypt {
data = data!.base64EncodedData(options: .lineLength64Characters)
}
return String(data: data!, encoding: .utf8)
}
return nil
}
}