iOS中将汉字转换成拼音的方法

//  将汉字转换为不带音调的拼音
- (NSString *)transformMandarinToLatin:(NSString *)string
{
    
    NSMutableString *preString = [string
mutableCopy];
    /*转换成成带音
调的拼音*/
    CFStringTransform((CFMutableStringRef)preString,
NULL, kCFStringTransformMandarinLatin,
NO);
    /*去掉音调*/
    CFStringTransform((CFMutableStringRef)preString,
NULL, kCFStringTransformStripDiacritics,
NO);
    
    return preString;
}