How to check if UITextFields are empty? - objective-c

Question

I have a bunch of UITextFields where a user must enter a number (the keyboard is the number pad) before pressing a submit button. When the submit button is pressed, a "check" method is called that wants to check if the data is valid... aka not empty. Now this would be easy if it was just one textField but I have 14. I want a simple if-statement that checks if one of the fields or all of the fields are empty....
I have the follow UITextFields declared: number1, number2, number3 etc etc
and I have the follow strings declared which can take the value of the UITextField.text... they are declared: temp1, temp2, temp3 etc...
how would I go about making a pseudocode if statement like the one below?
Thanks
if (!valid)
{
NSLog (#"not valid)
}
else
{
//proceed to next method
}

Answer 1

I am supposing UITextField variable as *tfield so here is the solution
if (tfield.text.length > 0 || tfield.text != nil || ![tfield.text isEqual:#""])
{
//do your work
}
else
{
//through error
}

Answer 2

or you could just call
[myTextField hasText];
which will return NO if the field is empty.

Answer 3

I think something like this is what you want. It's just using isEqualToString: to check if the string is empty.
NSString *temp1 = number1.text;
NSString *temp2 = number2.text;
... ///< temp3, etc
if ([temp1 isEqualToString:#""]) {
// temp1 not valid
} else if ([temp2 isEqualToString:#""]) {
// temp2 not valid
} ... {
// temp3, etc
} else {
// Valid
}
You may want to trim whitespace characters when grabbing temp1 so that #" " would also be blank. For that, take a look at NSString's stringByTrimmingCharactersInSet: method like so:
NSString *temp1 = [number1.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];
Update:
If you want to do it with an array you could do something like:
NSMutableArray *array = [NSMutableArray arrayWithCapacity:0];
[array addObject:number1.text];
[array addObject:number2.text];
... ///< number3, etc
BOOL ok = YES;
[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([obj isEqualToString:#""]) {
ok = NO;
*stop = YES;
}
}];
if (ok) {
// Valid
} else {
// Not valid
}

Answer 4

Something like this would iterate through your UITextFields:
[self.view.subviews enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
if ([obj isKindOfClass:[UITextField class]]) {
// do your checks
}
}];

Answer 5

you can put like this
if(![temp1 isEqualToString:#""] && ![temp2 isEqualToString:#""] ... ![temp14 isEqualToString:#""])
{
NSLog (#" valid);
}
else
{NSLog (#"not valid);
}

Answer 6

In Swift,
You can use this block of code.
if textField.text?.isEmpty {
//Return true if the textfield is empty or false if it's not empty.
}