检测NSString是否包含...？

Question

如何检测字符串是否包含某个单词？例如，我有一个字符串下面读取：

@"Here is my string." 

我想知道我是否可以检测字符串中的单词，如“是”例如。

Answer 1

这是我会怎么做：

NSString *someString = @"Here is my string"; 
NSRange isRange = [someString rangeOfString:@"is " options:NSCaseInsensitiveSearch]; 
if(isRange.location == 0) { 
    //found it... 
} else { 
    NSRange isSpacedRange = [someString rangeOfString:@" is " options:NSCaseInsensitiveSearch]; 
    if(isSpacedRange.location != NSNotFound) { 
     //found it... 
    } 
} 

您可以轻松地为一类添加此到NSString：

@interface NSString (JRStringAdditions) 

- (BOOL)containsString:(NSString *)string; 
- (BOOL)containsString:(NSString *)string 
       options:(NSStringCompareOptions)options; 

@end 

@implementation NSString (JRStringAdditions) 

- (BOOL)containsString:(NSString *)string 
       options:(NSStringCompareOptions)options { 
    NSRange rng = [self rangeOfString:string options:options]; 
    return rng.location != NSNotFound; 
} 

- (BOOL)containsString:(NSString *)string { 
    return [self containsString:string options:0]; 
} 

@end 

Answer 2

一个完整的解决方案将首先扫描字符串（不加空格） ，然后检查前面的字符是空白还是行尾。同样检查紧接着的字符是空白还是行尾。如果两项测试都通过，那么你有一场比赛。根据您的需要，您可能还会检查,，.,()等。

另一种方法当然是将字符串解析为单词并单独检查每个单词。

Answer 3

我推荐使用NSLinguisticTagger。我们可以用它来搜索Here is my string. His isn't a mississippi isthmus. It is?

NSLinguisticTagger *linguisticTagger = [[NSLinguisticTagger alloc] initWithTagSchemes:@[ 
             NSLinguisticTagSchemeTokenType, 
             ] 
                       options: 
             NSLinguisticTaggerOmitPunctuation | 
             NSLinguisticTaggerOmitWhitespace | 
             NSLinguisticTaggerOmitOther ]; 
[linguisticTagger setString:@"Here is my string. His isn't a mississippi isthmus. It is?"]; 
[linguisticTagger enumerateTagsInRange:NSMakeRange(0, 
                [[linguisticTagger string] length]) 
           scheme:NSLinguisticTagSchemeTokenType 
           options: 
NSLinguisticTaggerOmitPunctuation | 
NSLinguisticTaggerOmitWhitespace | 
NSLinguisticTaggerOmitOther | 
NSLinguisticTaggerJoinNames 
          usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) { 
           NSLog(@"tag: %@, tokenRange: %@, sentenceRange: %@, token: %@", 
             tag, 
             NSStringFromRange(tokenRange), 
             NSStringFromRange(sentenceRange), 
             [[linguisticTagger string] substringWithRange:tokenRange]); 
          }]; 

此输出：

tag: Word, tokenRange: {0, 4}, sentenceRange: {0, 19}, token: Here 
tag: Word, tokenRange: {5, 2}, sentenceRange: {0, 19}, token: is 
tag: Word, tokenRange: {8, 2}, sentenceRange: {0, 19}, token: my 
tag: Word, tokenRange: {11, 6}, sentenceRange: {0, 19}, token: string 
tag: Word, tokenRange: {19, 3}, sentenceRange: {19, 33}, token: His 
tag: Word, tokenRange: {23, 2}, sentenceRange: {19, 33}, token: is 
tag: Word, tokenRange: {25, 3}, sentenceRange: {19, 33}, token: n't 
tag: Word, tokenRange: {29, 1}, sentenceRange: {19, 33}, token: a 
tag: Word, tokenRange: {31, 11}, sentenceRange: {19, 33}, token: mississippi 
tag: Word, tokenRange: {43, 7}, sentenceRange: {19, 33}, token: isthmus 
tag: Word, tokenRange: {52, 2}, sentenceRange: {52, 6}, token: It 
tag: Word, tokenRange: {55, 2}, sentenceRange: {52, 6}, token: is 

它忽略Hismississippi和isthmus，甚至识别is的isn't内。

Answer 4

使用以下代码扫描句子中的单词。

NSString *sentence = @"The quick brown fox"; 
NSString *word = @"quack"; 
if ([sentence rangeOfString:word].location != NSNotFound) { 
    NSLog(@"Yes it does contain that word"); 
} 

Answer 5

我希望这可以帮助你，..在.m文件中添加此行或创建一个单独的类并集成此代码。

@implementation NSString (Contains) 

- (BOOL) containsString: (NSString*) substring 
{ 
NSRange range = [self rangeOfString : substring]; 
BOOL found = (range.location != NSNotFound); 
return found; 
}  
@end 

Answer 6

与iOS 8和斯威夫特，我们可以使用localizedCaseInsensitiveContainsString方法

let string: NSString = "Café" 
let substring: NSString = "É" 

string.localizedCaseInsensitiveContainsString(substring) // true 

Answer 7

在iOS8上，你现在可以使用：

BOOL containsString = [@"Here is my string." containsString:@"is"]; 

有一个关于如何 “改造” 成为一个有趣的帖子到iOS7： http://petersteinberger.com/blog/2014/retrofitting-containsstring-on-ios-7/