我tryed的NSData base64Encode回零迅速
let contents = results["contents"] as! String!
let decodedData = NSData(base64EncodedString: contents,
options:NSDataBase64DecodingOptions())
let decodedString = NSString(data: decodedData!, encoding: NSUTF8StringEncoding)
let contents = results["contents"] as! String!
let decodedData = NSData(base64EncodedString: contents, options:NSDataBase64DecodingOptions.IgnoreUnknownCharacters)
let decodedString = NSString(data: decodedData!, encoding: NSUTF8StringEncoding)
let contents = results["contents"] as! String!
let decodedData = NSData(base64EncodedString: contents, options:NSDataBase64DecodingOptions(rawValue: 0)!)
let decodedString = NSString(data: decodedData!, encoding: NSUTF8StringEncoding)
总是EXC_BAC_INSTRUCTION从decodedString 也许decodedData返回nil
为什么NSData的返回nil