NSString *str = [data base64EncodedStringWithOptions:0];
NSData *xxx = [[NSData alloc] initWithBase64EncodedString:str options:0];
NSString *str = [data base64EncodedStringWithOptions:0];
NSData *xxx = [[NSData alloc] initWithBase64EncodedString:str options:0];
本文标题：NSData NSstring Base64互转
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