So I'm currently making a calorie tracker. In this app, you enter the recent meal you ate, and the amount of calories in that meal. Then you press the "add" button. This button will save the data to a TableView called HistoryTableViewController. To check if the person has left a textfield blank, I have 3 "if statement". One looks like this:
if ([[self.amountText.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] < 1)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning!" message:@"You have not entered the amount of Calories!" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
[amountHistory removeObjectAtIndex:0];
}
There is one line of code that I know is wrong which is the
[amountHistory removeObjectAtIndex:0];
I don't necessarily want to remove the first object on the tableview, I just want to make sure that the item doesn't get added.
Thanks in advance.
EDIT:
I add an object to the array at the top of the if statements:
total+= self.amountText.text.intValue;
self.totalLabel.text = [NSString stringWithFormat:@"%d", total];
NSNumber *calorieNumber = [NSNumber numberWithInt:self.amountText.text.intValue];
NSString *foodString = nameOfTheFood.text;
NSString *historyString = [NSString stringWithFormat:@"%@ Calories in %@", calorieNumber, foodString];
[amountHistory addObject:historyString];
Sounds like you are thinking about it from the wrong angle.
Instead of adding the item to your array and then removing it if it is invalid, you should ensure the item is only added when it is valid.
So in your method you would only add the item at the end, after all validation has passed. You would add early return's in your if statements if the any validation fails so that you don't reach the code that adds the item to the array
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