使用Base64编解码NSData和NSString对象

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    NSData *nsdata = [@"iOS Developer Tips encode in Base64" dataUsingEncoding:NSUTF8StringEncoding];
    
    //根据NSData生成Base64编码的String
    NSString *base64Encode = [nsdata base64EncodedStringWithOptions:0];
    NSLog(@"Encode:%@", base64Encode);
    
    //NSData生成未编码的NSString
    NSString *noCodeString = [[NSString alloc]initWithData:nsdata encoding:NSUTF8StringEncoding];
    NSLog(@"noCodeString:%@",noCodeString);
    
    //NSData from  the base64 encoded str
    NSData *nsdataFromBase64String = [[NSData alloc]initWithBase64EncodedString:base64Encode options:0];
    
    
    //Decode NSString from NSData
    NSString *base64Decode = [[NSString alloc]initWithData:nsdata encoding:NSUTF8StringEncoding];
    NSLog(@"base64Decode:%@",base64Decode);