In PHP (which is what I'm most familiar with) it's a one line expression:
strpos('abc', 'b') !== false
What's the Objective C equivalent?
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1Does this help? techotopia.com/index.php/…jeffff– jeffff2012-07-13 18:42:30 +00:00Commented Jul 13, 2012 at 18:42
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The Cocoa classes are fairly well-documented. You're obviously encouraged to take a look at them any time you need something.zneak– zneak2012-07-13 18:43:46 +00:00Commented Jul 13, 2012 at 18:43
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@zneak I totally agree but a simple question isn't necessarily a bad question - especially considering how contrived some people's solutions are to simple questions. Documenting good answers to simple questions is of benefit to the community. Proof in point (a post I made the other day): stackoverflow.com/questions/11439180/… Nobody should be writing code equal to some of the bad answers. Having the simple answer documented is ultimately a good thing.John Erck– John Erck2012-07-13 18:54:05 +00:00Commented Jul 13, 2012 at 18:54
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3 Answers
[@"abc" rangeOfString:@"b"].location != NSNotFound
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I think categories can be use to package up pieces of functionality like this very nicely.
@interface NSString (ContainsString)
- (BOOL)containsString:(NSString *)string;
@end
@implementation NSString (ContainsString)
- (BOOL)containsString:(NSString *)string
{
NSRange range = [self rangeOfString:string options:NSCaseInsensitiveSearch];
return range.location != NSNotFound;
}
@end
When used, it makes the meaning very clear.
if ([@"this is a string" containsString:@"a string"]) {
…
}
In most projects this would be a part of a larger string method category and not it's own one-method category.
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- (NSRange)rangeOfString:(NSString *)aString
Return Value An NSRange structure giving the location and length in the receiver of the first occurrence of aString. Returns {NSNotFound, 0} if aString is not found or is empty (@"").
You can find more helpful string manipulation functions in the NSString Class Reference
