Sign Up + Confirmation Password iOS [duplicate] - ios

Question

This question already has answers here:
Understanding NSString comparison
(7 answers)
Closed 7 years ago.
I´m trying to make a registration form. There are two UITextField to write the Password and to confirm it. When i write exactly the same password, it always shows: "Passwords do not match ".
-(IBAction)signUp:(id)sender{
#try {
if([[name text] isEqualToString:#""] || [[mail text] isEqualToString:#""] || [[phone text] isEqualToString:#""] || [[password text] isEqualToString:#""] || [[rpassword text] isEqualToString:#""] ) {
[self alertStatus:#"Please check every field" :#"¡Alert!"];
}else if (password.text!=rpassword.text){
[self alertStatus:#"Passwords do not match " :#"¡Please Check!"];
}else {
NSString *strURL = [NSString stringWithFormat:#"http://miwebsite.com/signup.php?var1=%#&var2=%#&var3=%#&var4=%#", name.text, mail.text, phone.text, password.text];
NSURL *url2 = [NSURL URLWithString:strURL];
NSLog(#"url: %#", url2);
NSError *error;
NSData *dataURL = [NSData dataWithContentsOfURL:url2 options:0 error:&error];
if (dataURL == nil) {
NSLog(#"error: %#", error);
}
else {
NSLog(#"dataURL: %#", dataURL);
NSString *strResult = [[NSString alloc] initWithData:dataURL encoding:NSUTF8StringEncoding];
// THE REST OF THE CODE GOES HERE...
}
}
} #catch (NSException * e) {
NSLog(#"Exception: %#", e);
[self alertStatus:#"Sorry." :#"Failed"];
}
}
I used the debugger. password.text and rpassword.text are exactly the same word. ¿Why my code goes inside that sentence?
Thanks in advanced.

Answer 1

== in objective C is a pointer comparison instead of the content comparison. The text NSString object have 2 different memory address or pointers associated to them and although the content is same the memory they point is different and hence the statement inside this
else if (password.text!=rpassword.text){
[self alertStatus:#"Passwords do not match " :#"¡Please Check!"];
}
is executed. The pointers are different.
What you need is string comparison by doing so:
else if (![password.text.isEqualToString:rpassword.text]){
[self alertStatus:#"Passwords do not match " :#"¡Please Check!"];
}
For more explanation please check this link:
Understanding NSString comparison