In Objective-C, you can compare strings using the isEqualToString method or by using compare: method.
Here's an example of using isEqualToString method to compare two strings:
NSString *stringOne = @"hello";
NSString *stringTwo = @"world";
if ([stringOne isEqualToString: stringTwo]) {
NSLog(@"Both strings are equal.");
} else {
NSLog(@"The strings are not equal.");
}
The output in this case would be "The strings are not equal", because the values of stringOne and stringTwo are not equal.
Here's an example using the compare method to compare two strings:
NSString *stringOne = @"apple";
NSString *stringTwo = @"banana";
NSComparisonResult result = [stringOne compare: stringTwo];
if (result == NSOrderedDescending) {
NSLog(@"stringOne is greater than stringTwo");
} else if (result == NSOrderedAscending) {
NSLog(@"stringOne is less than stringTwo");
} else {
NSLog(@"Both strings are equal.");
}
The output in this case would be "stringOne is less than stringTwo", because "apple" comes before "banana" in alphabetical order.
I hope this helps!