Objective C Bridging header —— swift MD5

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swift使用md5算法：

1.新建一个桥接头文件Objective-CBridgingHeader.h，内容如下：

#ifndef QueryPhoneNumber_Objective_CBridgingHeader_h

#define QueryPhoneNumber_Objective_CBridgingHeader_h

#import <CommonCrypto/CommonHMAC.h>

#endif

2.工程属性 -> Build Settings -> All -> Levels ->

Swift Compiler - Code Generation -> Objective-C Bridging Header ->双击后面空行在弹出框里输入：

Objective-CBridgingHeader.h， 如图：

3.扩展String

import Foundation

extension String {func md5() -> String! {let str = self.cStringUsingEncoding(NSUTF8StringEncoding)let strLen = CUnsignedInt(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))let digestLen = Int(CC_MD5_DIGEST_LENGTH)let result = UnsafeMutablePointer<CUnsignedChar>.alloc(digestLen)CC_MD5(str!, strLen, result)var hash = NSMutableString()for i in 0..<digestLen {hash.appendFormat("%02x", result[i])}result.destroy()return String(format: hash as String)}
}

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