過濾NSArray無法正常工作時？是在NSString

當我嘗試過濾字符串數組我沒有得到匹配的值有一個？在使用filteredArrayUsingPredicate時：你可以用URL替換一個句子，你仍然會得到同樣的結果。過濾NSArray無法正常工作時？是在NSString

這裏的簡化代碼：

-(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"); 

    } 

}

如果我看的只是@「http://www.google.com」它過濾就好了。

下面是更正後的代碼：

-(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"); 

    } 

}

來源

2011-12-11 Chad

的?可能是一個特殊字符。只是逃避它：

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

來源

2011-12-11 03:13:50 Dani

謝謝，我曾試過一次逃生，但沒有意識到兩個將需要。 – Chad

@Chad：需要兩個，因爲一個被字符串文字吃掉。 – Dani

過濾NSArray無法正常工作時？是在NSString

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