• NSCharacter​Set 使用说明

    NSCharacter​Set 和 NSMutableCharacterSet  用面向对象的方式来表示一组Unicode字符，它经常与NSString及NSScanner组合起来使用，在不同的字符上做过滤、删除或者分割操作。为了给你提供这些字符是哪些字符的直观印象，请看看NSCharacterSet 提供的类方法

    • alphanumericCharacterSet
    • capitalizedLetterCharacterSet
    • controlCharacterSet
    • decimalDigitCharacterSet
    • decomposableCharacterSet
    • illegalCharacterSet
    • letterCharacterSet
    • lowercaseLetterCharacterSet
    • newlineCharacterSet
    • nonBaseCharacterSet
    • punctuationCharacterSet
    • symbolCharacterSet
    • uppercaseLetterCharacterSet
    • whitespaceAndNewlineCharacterSet
    • whitespaceCharacterSet

    我们使用下边的方法 打印看看这些方法

     1 void dumpCharacterSet( NSString *name )
 2 {
 3     unichar idx;
 4     NSCharacterSet *cset = [NSCharacterSet performSelector: NSSelectorFromString(name)];
 5     
 6     printf("Character set (0-127): %s
7-Bit: ", [name UTF8String]);
 7     
 8     for( idx = 0; idx < 256; idx++ )
 9     {
10         if ( 128 == idx ) {
11             printf( "
8-Bit: " );
12         }
13         
14         //Returns a Boolean value that indicates whether a given character is in the receiver.
15         if ([cset characterIsMember: idx])
16         {
17             //判断字符c是否为可打印字符（含空格）
18             if ( isprint(idx) ) {
19                 printf( "%c ", idx);
20             }
21             else {
22                 printf( "%02x ", idx);
23             }
24         }
25     }
26     printf("

");
27 }
     1 // Reference output...
 2     dumpCharacterSet( @"alphanumericCharacterSet" );
 3     dumpCharacterSet( @"controlCharacterSet" );
 4     dumpCharacterSet( @"decimalDigitCharacterSet" );
 5     dumpCharacterSet( @"decomposableCharacterSet" );
 6     dumpCharacterSet( @"illegalCharacterSet" );
 7     dumpCharacterSet( @"letterCharacterSet" );
 8     dumpCharacterSet( @"lowercaseLetterCharacterSet" );
 9     dumpCharacterSet( @"nonBaseCharacterSet" );
10     dumpCharacterSet( @"punctuationCharacterSet" );
11     dumpCharacterSet( @"uppercaseLetterCharacterSet" );
12     dumpCharacterSet( @"whitespaceAndNewlineCharacterSet" );
13     dumpCharacterSet( @"whitespaceCharacterSet" );

    打印结果如下 

    Character set (0-127): alphanumericCharacterSet
7-Bit: 0 1 2 3 4 5 6 7 8 9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 
8-Bit: aa b2 b3 b5 b9 ba bc bd be c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf d0 d1 d2 d3 d4 d5 d6 d8 d9 da db dc dd de df e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef f0 f1 f2 f3 f4 f5 f6 f8 f9 fa fb fc fd fe ff 

Character set (0-127): controlCharacterSet
7-Bit: 00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 7f 
8-Bit: 80 81 82 83 84 85 86 87 88 89 8a 8b 8c 8d 8e 8f 90 91 92 93 94 95 96 97 98 99 9a 9b 9c 9d 9e 9f ad 

Character set (0-127): decimalDigitCharacterSet
7-Bit: 0 1 2 3 4 5 6 7 8 9 
8-Bit: 

Character set (0-127): decomposableCharacterSet
7-Bit: 
8-Bit: c0 c1 c2 c3 c4 c5 c7 c8 c9 ca cb cc cd ce cf d1 d2 d3 d4 d5 d6 d9 da db dc dd e0 e1 e2 e3 e4 e5 e7 e8 e9 ea eb ec ed ee ef f1 f2 f3 f4 f5 f6 f9 fa fb fc fd ff 

Character set (0-127): illegalCharacterSet
7-Bit: 
8-Bit: 

Character set (0-127): letterCharacterSet
7-Bit: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 
8-Bit: aa b5 ba c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf d0 d1 d2 d3 d4 d5 d6 d8 d9 da db dc dd de df e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef f0 f1 f2 f3 f4 f5 f6 f8 f9 fa fb fc fd fe ff 

Character set (0-127): lowercaseLetterCharacterSet
7-Bit: a b c d e f g h i j k l m n o p q r s t u v w x y z 
8-Bit: b5 df e0 e1 e2 e3 e4 e5 e6 e7 e8 e9 ea eb ec ed ee ef f0 f1 f2 f3 f4 f5 f6 f8 f9 fa fb fc fd fe ff 

Character set (0-127): nonBaseCharacterSet
7-Bit: 
8-Bit: 

Character set (0-127): punctuationCharacterSet
7-Bit: ! " # % & ' ( ) * , - . / : ; ? @ [  ] _ { } 
8-Bit: a1 a7 ab b6 b7 bb bf 

Character set (0-127): uppercaseLetterCharacterSet
7-Bit: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z 
8-Bit: c0 c1 c2 c3 c4 c5 c6 c7 c8 c9 ca cb cc cd ce cf d0 d1 d2 d3 d4 d5 d6 d8 d9 da db dc dd de 

Character set (0-127): whitespaceAndNewlineCharacterSet
7-Bit: 09 0a 0b 0c 0d   
8-Bit: 85 a0 

Character set (0-127): whitespaceCharacterSet
7-Bit: 09   
8-Bit: a0

    非常的直观，当我们 使用的时候对照这个打印结果操作就行，

    下边再说一下如何过滤的

     1 // Set up for reading testString
 2     NSString *testString = @"Los Angeles;8.25;0.580561574;1,Tokyo;1.9;0.643872234;1;Honolulu,0;0;0;Toronto;7.9;5.3322;3;";
 3     // Parse CSV with NSScanner
 4     NSScanner *myScanner = [NSScanner scannerWithString:testString];
 5     
 6     NSString    *location;
 7     float        theRevenue;
 8     float        thePercent;
 9     int            theRank;
10     
11     // Set up data delimiter using semicolon//分号
12     
13     NSCharacterSet *CharacterSet;
14     
15     //Returns a character set containing the characters in a given string.
16     CharacterSet = [NSCharacterSet characterSetWithCharactersInString:@";,"];
17     
18     // Double check scanner string
19     NSLog (@"Scanner string
");
20     
21     //Returns the string with which the receiver was created or initialized.
22     NSLog (@"%@",[myScanner string]);
23     
24     // scanner loop start
25     while ([myScanner isAtEnd] == NO) {
26         
27         if ( [myScanner scanUpToCharactersFromSet:CharacterSet intoString:&location] ) {
28             NSLog (@"%@",location);
29         }
30         
31         // Skipping the ; and ,delimiter
32         if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])
33             ;
34         // Read Revenue data up to ; delimiter and skipping
35         //Scans for a float value, returning a found value by reference.
36         if([myScanner scanFloat:&theRevenue])
37             NSLog(@"%lf",theRevenue);
38         if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])
39             ;
40         
41         // Read Percentage data up to ; delimiter and skipping
42         if([myScanner scanFloat:&thePercent])
43             NSLog(@"%lf",thePercent);
44         if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])
45             ;
46         
47         // Read Ranking data up to ; delimiter and skipping
48         if([myScanner scanInt:&theRank])
49             NSLog(@"%i",theRank);
50         if([myScanner scanString:@";" intoString:NULL] || [myScanner scanString:@"," intoString:NULL])
51             ;
52     }

    打印结果如下

    2016-06-12 15:04:37.967 ModelBenchmark[12012:171056] Los Angeles
2016-06-12 15:04:37.967 ModelBenchmark[12012:171056] 8.250000
2016-06-12 15:04:37.967 ModelBenchmark[12012:171056] 0.580562
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 1
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] Tokyo
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 1.900000
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 0.643872
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 1
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] Honolulu
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 0.000000
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 0.000000
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 0
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] Toronto
2016-06-12 15:04:37.968 ModelBenchmark[12012:171056] 7.900000
2016-06-12 15:04:37.969 ModelBenchmark[12012:171056] 5.332200
2016-06-12 15:04:37.969 ModelBenchmark[12012:171056] 3

    不难看出，对字符串的过滤非常灵活，因此我们应该使用这种方法来过滤字符串。
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  • 原文地址：https://www.cnblogs.com/machao/p/5577605.html
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