Case insensitive comparison NSString

Question

Can anyone point me to any resources about case insensitive comparison in Objective C  It doesn t seem to have an equivalent method to str1 equalsIgnoreCase str2

User · Answer

to check with the prefix as in the iPhone ContactApp     string rangeOfString prefixString options NSCaseInsensitiveSearch  location    0    this blog was useful for me

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if     Some String  caseInsensitiveCompare   some string      NSOrderedSame          strings are equal except for possibly case     The documentation is located at Search and Comparison Methods

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Converting Jason Coco s answer to Swift for the profoundly lazy      if   Some String   caseInsensitiveCompare  some string       OrderedSame         Strings are equal

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An alternative if you want more control than just case insensitivity is    someString compare otherString options NSCaseInsensitiveSearch     Numeric search and diacritical insensitivity are two handy options

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On macOS you can simply use - NSString isCaseInsensitiveLike    which returns BOOL just like -isEqual    if     Test  isCaseInsensitiveLike    test           Success

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-  NSComparisonResult caseInsensitiveCompare  NSString   aString

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You could always ensure they re in the same case before the comparison   if    stringX uppercaseString  isEqualToString  stringY uppercaseString             They re equal     The main benefit being you avoid the potential issue described by matm regarding comparing nil strings  You could either check the string isn t nil before doing one of the compare options  methods  or you could be lazy  like me  and ignore the added cost of creating a new string for each comparison  which is minimal if you re only doing one or two comparisons

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A new way to do this  iOS 8  let string  NSString    Caf    let substring  NSString         string localizedCaseInsensitiveContainsString substring     true

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Try this method   -  NSComparisonResult caseInsensitiveCompare  NSString   aString

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NSString  stringA   NSString  stringB    if  stringA  amp  amp   stringA caseInsensitiveCompare stringB     NSOrderedSame            match      Note  stringA  amp  amp  is required because when stringA is nil    stringA   nil    stringA caseInsensitiveCompare stringB     return 0   and so happens NSOrderedSame is also defined as 0   The following example is a typical pitfall    NSString  rank     NSUserDefaults standardUserDefaults  stringForKey   Rank     if   rank caseInsensitiveCompare   MANAGER      NSOrderedSame            what happens if  Rank  is not found in standardUserDefaults

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NSMutableArray  arrSearchData    NSArray  data  arrNearByData objectAtIndex i   NSString  strValue  NSString stringWithFormat         data valueForKey   restName     NSRange r    strValue rangeOfString key options NSCaseInsensitiveSearch    if r location    NSNotFound          arrSearchData addObject data

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Alternate solution for swift   To make both UpperCase   e g   if   ABcd  uppercased       abcD  uppercased         or to make both LowerCase   e g   if   ABcd  lowercased       abcD  lowercased

[ios] Case insensitive comparison NSString

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