How to delete UITextfield and entered data from it in iOS - ios

Question

I have develop one application and in that I have two UIButton named [+] and [-] and one UITextField default.
Now what I want is when I click on plus [+] button it should add one UITextField in UIView that is work perfectly to me but when I click on minus [-] button it should delete last created UITextField that is not working now for me.
How to manage that?
here is my code to plus[+] button.
- (IBAction)btnPlusClicked:(id)sender
{
scrollViewSpecialitiesTxtFields.hidden = FALSE;
float y;
y = (35 * txtSpecialityFieldCounter);
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, y, 120, 30)];
textField.delegate = self;
textField.borderStyle = UITextBorderStyleRoundedRect;
[arraySpecialitiesTxtFields insertObject:textField atIndex:arraySpecialitiesTxtFields.count];
scrollViewSpecialitiesTxtFields.contentSize = CGSizeMake(125, y+30);
[scrollViewSpecialitiesTxtFields addSubview:textField];
txtSpecialityFieldCounter++;
NSLog(#"txtSpecialityFieldCounter : %d",txtSpecialityFieldCounter);
}
here is my minus [-] button code
-(IBAction)btnMinusClicked:(id)sender
{
[scrollViewSpecialitiesTxtFields.subviews makeObjectsPerformSelector:#selector(removeFromSuperview)];
txtSpecialityFieldCounter--;
NSLog(#"txtSpecialityFieldCounter : %d",txtSpecialityFieldCounter);
float y;
y = (35 * txtSpecialityFieldCounter);
for(int i = 0 ; i < txtSpecialityFieldCounter; i++)
{
UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(0, y, 120, 30)];
textField.delegate = self;
textField.borderStyle = UITextBorderStyleRoundedRect;
[arraySpecialitiesTxtFields insertObject:textField atIndex:arraySpecialitiesTxtFields.count];
scrollViewSpecialitiesTxtFields.contentSize = CGSizeMake(125, y-30);
[scrollViewSpecialitiesTxtFields addSubview:textField];
}
}
I know minus[-] button code is wrong but let me know changes

Answer 1

Create a global variable as NSMutableArray *myAddedTextfields and in viewDidLoad-> myAddedTextFields = [NSMutableArray array];
- (IBAction)plusAction:(id)sender
{
UITextField *textField1 = [[UITextField alloc]initWithFrame:CGRectMake(50, 50, 100, 20)];
textField1.text = #"hey how r u";
textField1.backgroundColor = [UIColor grayColor];
textField1.tag = 1;
[self.view addSubview:textField1];
[myAddedTextFields addObject:textField1];
}
- (IBAction)minusAction:(id)sender
{
UITextField *txtField = [myAddedTextFields objectAtIndex:myAddedTextFields.count -1]; //for deleting from the last textfield onwards.
[txtField removeFromSuperView];
[myAddedTextFields removeObjectIdenticalTo:txtField];
}
I have edited your method.. hope this helps.

Answer 2

Whenever you want to add an UITextField on a superview, set the tag of that component (UITextField).
And when you want to remove it from superview then get the reference of that component (UITextField) using the tag and remove it from the superview.
Here is an example that may be helpful to you:
-(IBAction)plusAction:(id)sender
{
UITextField *textField1 = [[UITextField alloc]initWithFrame:CGRectMake(50, 50, 100, 20)];
textField1.text = #"hey how r u";
textField1.backgroundColor = [UIColor grayColor];
textField1.tag = 1;
[self.view addSubview:textField1];
}
-(IBAction)minusAction:(id)sender
{
UITextField * textfield = (UITextField *)[self.view viewWithTag:1];
[textfield removeFromSuperview];
}

Answer 3

Yes, you could use the tag option. Or you could use an NSArray holding your UITextFields.
#interface MyTextFieldViewClass ()
#property (nonatomic, retain) NSMutableArray *textFields;
#end
#implementation MyTextFieldViewClass
- (void)viewDidLoad {
[super viewDidLoad];
self.textFields = [NSMutableArray array];
}
- (IBAction)addTextField:(id)sender {
UITextField *tf = [[UITextField alloc] initWithFrame:CGRectMake(50, 50, 100, 20)];
[self.textFields addObject:tf];
[self.view addSubview:tf];
}
- (IBAction)removeTextField:(id)sender {
UITextField *tf = [self.textFields lastObject];
[tf removeFromSuperview];
[self.textFields removeLastObject];
}
#end
This would be a little better since you do not have to iterate over all the views/ids that exist in self.view.subviews. Also, using the tag might not be reliable since you always want to remove the last item, so you would either need to keep the last item number in memory or you need to iterate over all the subviews in order to find the UITextField with the highest tag and in order to remove it.