Re: How to Change a button state when textFields become not empty

Patrick CARDONA wrote:
> Hello,
>
> I am working on an Internet Shortcuts Manager (aka SaveLink).
>
> I associated the same action (statechange:) on my two fields ('name' 
> and 'link').
> If they are not empty, the 'savebutton' should be enabled.
> But my button state does never change. Initial state is disabled and 
> it remains in this state.
>

I didn't download your project, just reading the code.

Are you sure you get statechange called? is it connected?
Put an NSLog(@"statechange called") and check.

>
> In the class:
>
>> @implementation
>>  // (...)
>>
>> - (IBAction) statechange: (id)sender
>> {
>>   // We retrieve values from textFileds outlets
>>   NSString *nameLink = [name stringValue];
>>   NSString *urlLink = [link stringValue];
>>   int lenName = [nameLink length];
>>   int lenLink = [urlLink length];

These are unsigned, or better NSUinteger, not int. Won't change, just 
nitpick.

>>   if(lenName>0 && lenLink>0)
>>   {

Put an NSLog(@"Enable"); here so you are sure that the condition is 
matched and the issue is in setEnabled.

You can easily write this condition as:


if([nameLink length] && [urlLink length])

or for extra paranoids

if((nameLink && [nameLink length]) && (urlLink && [urlLink length]))


It checks that both string are valid and longer than zero. Not 
necessary, but it can also be quicker, since it will bail out on a nil 
string.

you could also try to trim spaces.


Riccardo