If else statment not work in my app

Question

I´m making a dictionary (this is my test app) here is my code which not work:

- (IBAction) btnClickMe_Clicked:(id)sender {


    NSString *kw = s.text;

    NSString *encodedkw =  [kw stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

    NSString *mms = [NSString stringWithFormat: @"%@", encodedkw];

    if (mms=NULL){
     iMessageLabel.text=@"put text";
    } else if (mms=@"a"){
        iMessageLabel.text=@"this is a";
    } else if (mms=@"b"){
    iMessageLabel.text=@"this is b";
    }


}

anybody have some idea with this ? thanks ALex

Answer 1

May it happen, that you need to call some kind of string manipulation routine like compare to compare strings, not just comparing the pointers?

Besides mms=NIL means assignment NIL to mms not comparison desired.

Upd.: NIL does not mean empty string. You should write [mms length] == 0 instead to see if the string is empty.

Answer 2

You cannot use == on NSString objects. Try doing this:

if (encodedkw == nil){
    iMessageLabel.text=@"put text";
} else if ([encodedkw isEqualToString:@"a"]){
   iMessageLabel.text=@"this is a";
} else if ([encodedkw isEqualToString:@"b"]){
   iMessageLabel.text=@"this is b";
}

mms should be equal to encodedkw so I switched to using that. Also I'm using isEqualToString for string comparison. Finally, I've changed the null check to check against nil instead of NULL.

Answer 3

You've used = rather than ==

Answer 4

yeah thank Colin Gislason your code is help me now it work BUT:::::: how about if (mms==NULL){ it stil not work...i have test i by not put anything and click on it..the message "put text"are not showing :((((((

reagards Alex

Answer 5

Oh my buddha after i put if ([mms length] == 0){ now eveything is working perfect.. I really dont know how to thank you you..you ...you and you here who have given me the help.. so happy now.....:)))))

but one question please... if i will make a dictionary project which way is best ? 1. use database from my web-site 2. use sqllite inside my app 3. use this way that i´m doing now by using if else statment

thank so much eveybody