Question

I have a problem with the Dropbox iPad login modal view controller: sometimes you can’t write in the password textfield; you can select it and the keyboard appears, but you can’t write. A workaround is to press login, it says you haven’t entered the password, you press ok, select it again and now works. It’s not very nice for the users. So now the question: have someone found a way to fix the Dropbox SDK or is a problem that I’m the only one to have?

Answer 1

I use the Dropbox SDK with an iPad app. I’ve reviewed their DBLoginController.h/.m code. The password control is a simple UITextField that is added to a UITableViewCell. There are only a few places where the text being typed into the field could be changed on-the-fly. One is -(BOOL)textField:shouldChangeCharactersInRange:replacementString. Looking at the code in DBLoginController I see this:

- (BOOL)textField:(UITextField *)textField 
                   shouldChangeCharactersInRange:(NSRange)range
                   replacementString:(NSString *)string {
   [self performSelector:@selector(updateActionButton) withObject:nil afterDelay:0];
   return YES;
}

This is fine, since it always returns YES.

The next possibility is that the textField is not actually getting focus. The best way to test for this would be to put an NSLog() in the shouldChangeCharactersInRange. That NSLog() should be hit any time you type a character in the password field. If you are typing and you don’t see any NSLog() output, it means the password field doesn’t have focus. The next step would be to figure out what does have focus and why.

The DBLoginController is a fairly simple class. It shouldn’t be hard to track down what is going on.

One final thought: if you have any categories defined on UITextField, it might be affecting how some textFields are working.