CFStringTransform((__bridge CFMutableStringRef)str, 0, kCFStringTransformStripDiacritics, NO); 變換的是 str
枚舉： kCFStringTransformMandarinLatin 帶聲調的拼音

kCFStringTransformStripDiacritics 純拼音

這裡我寫一個方法，將需要轉換的字符串輸入就行了

具體為

NSString *string = @"中文";
    NSString *text = [self stringWithForChainese:string];

- (NSString *)stringWithForChainese:(NSString *)text
{
    CFStringTransform((__bridge CFMutableStringRef)text, 0, kCFStringTransformStripDiacritics, NO);
    return text;
}