Question

Im new to xcode and objective c. I have asked this question three times and still can’t find a good method or answer. I have several uitextfields that accept user input and adds it to the combinedtextField in order of IBAction used.ie user inputs big in one field,bad in the next one and boy in the third and the result is big bad boy in the combinedtextField.

-(IBAction)addtextField1: (id)sender
{
 combinedtextField.text = [NSMutableString stringWithFormat:@"%@ %@",
 combinedtextField.text,textField1.text];
}

-(IBAction)addtextField2: (id)sender
{
 combinedtextField.text = [NSMutableString stringWithFormat:@"%@ %@",
             combinedtextField.text,  textField2.text];
}
-(IBAction)addtextField3:(id)sender
{
combinedtextField.text = [NSMutableString stringWithFormat:@"%@ %@",
                   combinedtextField.text,textField3.text];
}

Now this is where it gets interesting.I need to be able to remove the selected text from the combinedtextField.

-(IBAction)removetextField1:(id)sender
{
  //////////????????????////////////////
}

-(IBAction)removetextField2: (id)sender
{
  //////////????????????////////////////
}
-(IBAction)removetextField3: (id)sender
{
//////////????????????////////////////
}   

If I tap the removetextField2 button it would remove the corresponding text(bad) from the combinedtextField and then it would read (big boy)
Ive looked into nsarrays,nsdictionarys and other methods and have got no where.
Need some way of possibly tagging the input and removing it that way. Example code would be great and very much appreciated.

Answer 1

You’ve left out some important details about your app, so I’m making some guesses about how it should work.

Perhaps what you should do is keep a mutable array of all of the fragments that have been added to the combined string:

@implementation MyViewController {
    NSMutableArray *fragments_;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    fragments_ = [[NSMutableArray alloc] init];
}

When one of the add buttons is tapped, you append the corresponding field’s text to the array and recompute the combined string:

- (IBAction)addTextField1:(id)sender {
    [fragments_ addObject:textField1.text];
    [self updateCombinedTextField];
}

- (void)updateCombinedTextField {
    combinedTextField.text = [fragments componentsJoinedByString:@" "];
}

When one of the remove buttons is tapped, you try to remove the corresponding field’s text from the fragments array and recompute the combined string:

- (IBAction)removeTextField1:(id)sender {
    [fragments_ removeObject:textField1.text];
    [self updateCombinedTextField];
}

That will remove all occurrences of field 1’s text from the fragments array. If you just want to remove one instance, you will need to use indexOfObject: (or one of its variants) followed by removeObjectAtIndex:.