Ios 过滤的NSArray在出现故障时无法正常工作？在字符串中

当我尝试筛选字符串数组时，我没有得到与具有？在使用filteredArrayUsingPredicate:时，请在其中输入。您可以将URL替换为一个句子，只需使用？你还是会得到同样的东西

以下是简化代码：

-(void)test {

    NSArray *theURLs = [NSArray arrayWithObjects:@"http://www.google.com", @"http://www.google.com?test=1", nil];

    NSString *currentURL = @"http://www.google.com?test=1";
    NSLog(@"currentURL %@", currentURL);
    NSPredicate *matchURLPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES[cd] %@", [currentURL lowercaseString]];
    NSLog(@"match predicate %@", matchURLPredicate);
    NSArray *filteredArray = [theURLs filteredArrayUsingPredicate:matchURLPredicate];
    NSLog(@"filtered array %@", filteredArray);
    if ([filteredArray count]== 0) {

        NSLog(@"http://www.google.com?test=1 should have been found, but  was not");

    } else {

        NSLog(@"http://www.google.com?test=1 was found");

    }

}

如果我只寻找@”http://www.google.com“很好

以下是更正后的代码：

-(void)test {

    NSArray *theURLs = [NSArray arrayWithObjects:@"http://www.google.com", @"http://www.google.com?test=1", nil];

    NSString *currentURL = @"http://www.google.com\\?test=1";
    NSLog(@"currentURL %@", currentURL);
    NSPredicate *matchURLPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES[cd] %@", [currentURL lowercaseString]];
    NSLog(@"match predicate %@", matchURLPredicate);
    NSArray *filteredArray = [theURLs filteredArrayUsingPredicate:matchURLPredicate];
    NSLog(@"filtered array %@", filteredArray);
    if ([filteredArray count]== 0) {

        NSLog(@"http://www.google.com?test=1 should have been found, but  was not");

    } else {

        NSLog(@"http://www.google.com?test=1 was found");

    }

}

---

？

可能是一个特殊字符。逃避它吧：

@"http://www.google.com\\?test=1"

---

？

可能是一个特殊字符。逃避它吧：

@"http://www.google.com\\?test=1"

---

谢谢，我尝试过一次转义，但没有意识到需要两次。@Chad:需要两次，因为一次被字符串文字吃掉。谢谢，我尝试过一次转义，但没有意识到需要两次。@Chad:需要两次，因为一次被字符串文字吃掉。