When I convert NSString to NSData, after convert from NSData to NSString
NSString *input = @"ステータス";
NSData *output = [NSData dataWithBytes:[input UTF8String] length:[input length]];
NSString *output2 = [[NSString alloc] initWithData:output encoding:NSUTF8StringEncoding];
The output2 is nil.
If input is alphabet character, it ok.
The correct conversion is
NSData* output = [input dataUsingEncoding:NSUTF8StringEncoding];
The problem with your code is that [input length]
gives the number of Unicode characters, not the number of UTF-8 bytes.
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