ios - 判断某字符串是否含有中文字符

-(BOOL)isHasChineseChar:(NSString *)string{
    
    BOOL bool_value = NO;
    for (int i=0; i<string.length; i++) {
        NSRange range =NSMakeRange(i, 1);
        NSString * strFromSubStr=[string substringWithRange:range];
        const char * cStringFromstr=[strFromSubStr UTF8String];
        if (strlen(cStringFromstr)==3) {
            //有汉字
            bool_value = YES;
        }
    }
    return bool_value;
}