Check if NSMutableArray contains text from textfield - iphone

Question

I want to check if the text inserted in a textfield is also in my NSMutableArray.
So let's say my NSMutableArray has these objects: "Hey, Hello, No, Yes".
Then when a user enters the text: "Hello" i want there to appear a UIAlertView. I now have the following:
for (int slt = 0; slt < [zouten count]; slt++) {
if (zout.text = [zouten objectAtIndex:slt]) {
alert = [[UIAlertView alloc]initWithTitle:#"Goedzo!" message:[NSString stringWithFormat:#"Je hebt een zout gevonden"] delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
}
}
[alert show];
But somehow the message appears with every word. what am i doing wrong?

Answer 1

When you compare like this:
if (zout.text = [zouten objectAtIndex:slt])
you are actually assigning instead of comparing so it will be TRUE always.Therefore instead of using =, you should compare like this:
if ([zout.text isEqualToString:[zouten objectAtIndex:slt]])
Your code should be:
for (int slt = 0; slt < [zouten count]; slt++) {
if ([zout.text isEqualToString:[zouten objectAtIndex:slt]]) {
alert = [[UIAlertView alloc]initWithTitle:#"Goedzo!" message:[NSString stringWithFormat:#"Je hebt een zout gevonden"] delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[alert release];
break;
}
}

Answer 2

You can use isEqualToString method to compare strings.
if([zout.text isEqualToString:[zouten objectAtIndex:slt]])

Answer 3

Alternatively you could make your code more concise by converting to a set and checking for the entry, e.g.
NSSet *set = [NSSet setWithArray: zouten];
if([set containsObject:zout.text]) {
...
}