Code Simplification Objective C - ios

Question

Right, an easy one for most.
So with in a health App i have several text field for calculating a users BMI. I have the following code actions ALL EACH linked to a button to calculate the BMI. The idea being that if all the height fields and weight fields are empty then the app disables the button. the fields are linked to cmDisable and feetDisable etc... Can anyone think of a MUCH simpler way of doing this?
Many Thanks
- (IBAction)cmDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}
- (IBAction)feetDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}
- (IBAction)inchesDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}
- (IBAction)kgDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}
- (IBAction)stoneDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}
- (IBAction)poundsDisable:(id)sender {
if (((UITextField*)sender).text.length > 0) {
[_calculateButton setEnabled:YES];
} else {
[_calculateButton setEnabled:NO];
}
}

Answer 1

So, if I am understanding correctly, you want to disable a button when all fields are empty.
What you could do is add all the buttons to a collection from Interface Builder. So you would have
IBOutletCollection(UITextField) NSArray *fields; //Linked to all fields
Then you would connect all fields to the "Editing Ended" action for UITextFields. The method would like the following:
- (IBAction) fieldsValueChanged:(id) sender {
BOOL shouldDisable = NO;
for(UITextField *next in fields) {
if(next.text.length > 0) {
shouldDisable = YES;
break;
}
}
[_calculateButton setEnabled:shouldDisable];
}