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NSMutableString *ms = [[NSMutableString alloc] initWithString:@"我是中国人"];
if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformMandarinLatin, NO)) {
    NSLog(@"Pingying: %@", ms); // wǒ shì zhōng guó rén
}
if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO)) {
    NSLog(@"Pingying: %@", ms); // wo shi zhong guo ren
}

NSMutableString *ms = [[NSMutableString alloc] initWithString:@"我是中国人"]; if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformMandarinLatin, NO)) { NSLog(@"Pingying: %@", ms); // wǒ shì zhōng guó rén } if (CFStringTransform((__bridge CFMutableStringRef)ms, 0, kCFStringTransformStripDiacritics, NO)) { NSLog(@"Pingying: %@", ms); // wo shi zhong guo ren }