How do I check if a string contains another 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!");}

The key is noticing that rangeOfString: returns an NSRange struct, and the documentation says that it returns the struct {NSNotFound, 0} if the "haystack" does not contain the "needle".

And if you're on iOS 8 or OS X Yosemite, you can now do: (*NOTE: This WILL crash your app if this code is called on an iOS7 device).

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

(This is also how it would work in Swift)

👍

For iOS 8.0+ and macOS 10.10+, you can use NSString's native containsString:.

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

Since this seems to be a high-ranking result in Google, I want to add this:

iOS 8 and OS X 10.10 add the containsString: method to NSString. An updated version of Dave DeLong's example for those systems:

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