How do I check if a string contains another string in Objective-C?

For iOS 8.0+ and macOS 10.10+, you can use NSString's native [`containsString:`](

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).

For older versions of iOS and macOS, you can create your own (obsolete) category for NSString:

@interface NSString ( SubstringSearch )
- (BOOL)containsString:(NSString *)substring;
@end

// - - - -

@implementation NSString ( SubstringSearch )

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

@end

***Note: Observe Daniel Galasko's comment below regarding naming***