NSData 相互変換 NSString
NSData >> NSString
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSString >> NSData
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
NSData >> NSString
NSString *string = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSString >> NSData
NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];