NSPredicate的使用

字符串使用

 //字符串和某个字符串相等

  NSPredicate *predicate = [NSPredicatepredicateWithFormat:@"SELF == %@",@"predicate"];

  

 //字符串包含某个字符串

  predicate1 = [NSPredicatepredicateWithFormat:@"SELF Contains %@",@"ing"];

    //从数组中查找某个字符串或包含某种特征的字符串

    NSArray *array = [NSArrayarrayWithObjects:@"shanghai",@"beijing",@"tianjing",nil];

    NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"SELF == 'shanghai'"];

    NSMutableArray *resultArray = nil;

    resultArray = [[arrayfilteredArrayUsingPredicate:predicate1]mutableCopy];

    if (resultArray.count == 0)

    {

        NSLog(@"没有上海");

    }

    else

    {

        NSLog(@"%@",[resultArray objectAtIndex:0]);

    }

    [resultArray removeAllObjects];

    predicate1 = [NSPredicatepredicateWithFormat:@"SELF Contains %@",@"ing"];

    resultArray = [[arrayfilteredArrayUsingPredicate:predicate1]mutableCopy];

    for (int i = 0; i < resultArray.count; i++)

    {

        NSLog(@"%@",[resultArray objectAtIndex:i]);

    }

//字符串的模糊匹配

  predicate = [NSPredicatepredicateWithFormat:@"SELF LIKE［cd] '*hh*'"];

  

  predicate = [NSPredicatepredicateWithFormat:@"SELF BEGINSWITH 'A'"];

    predicate1 = [NSPredicatepredicateWithFormat:@"SELF ENDSWITH 't'"];

    if ([predicate evaluateWithObject:@"Art"] && [predicate1evaluateWithObject:@"Art"])

    {

        NSLog(@"以A开头,以t结尾");

    }

        注:[c]不区分大小写[d]不区分发音符号即没有重音符号[cd]既不区分大小写，也不区分发音符号。

正则表达式的使用

1.邮箱地址校验

-(BOOL) isValidEmail:(NSString *)str

{

    NSString *strRegex =@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{1,3}";

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",strRegex];

    return [predicate evaluateWithObject:str];

 

}

2.IP地址校验

-(BOOL) isIPAddress:(NSString *) str

{

    NSString *strRegex =@"[0-9]{1,3}+\\.[0-9]{1,3}+\\.[0-9]{1,3}+\\.[0-9]{1,3}";

    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",strRegex];

    return [predicate evaluateWithObject:str];

    

}