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swift 開發過程中的一些小總結

import FoundationextensionString {var md5 : String{let str = self.cString(using:String.Encoding.utf8)let strLen = CC_LONG(self.lengthOfBytes(using:String.Encoding.utf8))let digestLen = Int(CC_MD5_DIGEST_LENGTH)let result = UnsafeMutablePointer<CUnsignedChar>.allocate(capacity: digestLen)
CC_MD5(str!, strLen, result)let hash = NSMutableString()for i in0 ..< digestLen {            hash.appendFormat("%02x", result[i])        }        result.deinitialize()returnString(format: hash asString)    }}