Swift中一些小技巧、小知識點_MD5

來源:互聯網
上載者:User

一、編譯器的幾個符號用來便於調試

#file  --> 包含這個符號檔案的路徑

#function --> 包含這個符號的方法名

#line --> 行號



二、在某一個範圍內產生隨機數

func randomInrange(range: Range<Int>) -> Int {    let count = UInt32(range.endIndex - range.startIndex)    return Int(arc4random_uniform(count)) + range.startIndex}

三、swift沒有OC中[NSString stringWithFormat:@"%@, %2.f",A,B]這樣的格式化輸出

採取的思路是運用Extension



四、MD5的實現

首先在橋接檔案中 匯入#import <CommonCrypto/CommonCrypto.h>

然後實現String的Extension

extension String {    var MD5: String {        let cString = self.cStringUsingEncoding(NSUTF8StringEncoding)        let length = CUnsignedInt(self.lengthOfBytesUsingEncoding(NSUTF8StringEncoding))        let result = UnsafeMutablePointer<CUnsignedChar>.alloc(Int(CC_MD5_DIGEST_LENGTH))        CC_MD5(cString!, length, result)        return String(format: "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", result[0], result[1], result[2], result[3], result[4], result[5], result[6], result[7], result[8], result[9], result[10], result[11], result[12], result[13], result[14], result[15])    }}

五、swift單例的實現


對比OC 單例的實現


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