NSString search whole text for another string

问题

I would like to search for an NSString in another NSString, such that the result is found even if the second one does not start with the first one, for example:

eg: I have a search string "st". I look in the following records to see if any of the below contains this search string, all of them should return a good result, because all of them have "st".

Restaurant

stable

Kirsten

At the moment I am doing the following:

NSComparisonResult result = [selectedString compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];

This works only for "stable" in the above example, because it starts with "st" and fails for the other 2. How can I modify this search so that it returns ok for all the 3?

Thanks!!!

回答1:

Why not google first?

String contains string in objective-c

NSString *string = @"hello bla bla";
if ([string rangeOfString:@"bla"].location == NSNotFound) {
  NSLog(@"string does not contain bla");
} else {
  NSLog(@"string contains bla!");
}

回答2:

Compare is used for testing less than/equal/greater than. You should instead use -rangeOfString: or one of its sibling methods like -rangeOfString:options:range:locale:.

回答3:

I know this is an old thread thought it might help someone.

The - rangeOfString:options:range: method will allow for case insensitive searches on a string and replace letters like ‘ö’ to ‘o’ in your search.

NSString *string = @"Hello Bla Bla";
NSString *searchText = @"bla";
NSUInteger searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;
NSRange searchRange = NSMakeRange(0, string.length);
NSRange foundRange = [string rangeOfString:searchText options:searchOptions range:searchRange];
if (foundRange.length > 0) {
    NSLog(@"Text Found.");
}

For more comparison options NSString Class Reference

Documentation on the method - rangeOfString:options:range: can be found on the NSString Class Reference

来源：https://stackoverflow.com/questions/7574041/nsstring-search-whole-text-for-another-string

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