NSNull length crash with textField,

Question

when i enter any character or number with keyboard.the app crash with this info

"Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[NSNull length]: unrecognized selector sent to instance 0x103b5daf0'".

And every textfield that used in the app has this problem.The textfield is in a storybord-based appliction.this is the textfield delegate i overwrite and this is the exception throw call stack

Answer 1

replace ([textField.text isEqual:[NSNull null]]) with (textField.text.length == 0).

Answer 2

According to your exception throw call stack, this crash is caused of by this method [textfield.text isEqual:[NSNull null]]`. You can use this code:

if (textfield.text){

}

Or

if ([textfield.text isEqualToString:@"your text"]){

}

textfield.text is an object which class is NSString and [NSNull null] is also an object that represent empty object.

Answer 3

The problem is probably that you somewhere set the textField's text property to NSNull (which is a bug).

It's not (like other answers state) the comparison [textField.text isEqual:[NSNull null]] that leads to the bug. This line is nonsense, but can't result in the crash.

Search for places where you set the textfield's text property and check that the value is always of type NSString.