Switch in UIAlert Controller programmatically

Question

I am creating an registration dialog in swift with 3 text field and one Switch and I successfully add three text field two the Alert. The following code shows the same.

Answer 1

You can use the RightView of the TextField to add a button. Adding a switch would be nice but the switch does not fit into the TextField height nor can you change the height. To this end you can add a button and use images to make a TickBox.

I have ripped this out of a project so the example image is a little more than below.

In the ViewController header add the TextField Delegate

@interface CustomTableViewController : UITableViewController 

Then create your AlertController and add the TextField

// create an alert controller
UIAlertController *alertWithText = [UIAlertController alertControllerWithTitle:title message:body preferredStyle:UIAlertControllerStyleAlert];

// create the actions handled by each button
UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

}];

UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDestructive handler:^(UIAlertAction * _Nonnull action) {

}];

// add the actions to the alert
[alertWithText addAction:action1];
[alertWithText addAction:action2];

// Establish the weak self reference
__weak typeof(self) weakSelf = self;

[alertWithText addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

    // Create button
    UIButton *checkbox = [UIButton buttonWithType:UIButtonTypeCustom];
    [checkbox setFrame:CGRectMake(2 , 2, 18, 18)];  // Not sure about size
    [checkbox setTag:1];
    [checkbox addTarget:weakSelf action:@selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];

    // Setup image for button
    [checkbox.imageView setContentMode:UIViewContentModeScaleAspectFit];
    [checkbox setImage:[UIImage imageNamed:@"unchecked_checkbox.png"] forState:UIControlStateNormal];
    [checkbox setImage:[UIImage imageNamed:@"checked_checkbox.png"] forState:UIControlStateSelected];
    [checkbox setImage:[UIImage imageNamed:@"checked_checkbox.png"] forState:UIControlStateHighlighted];
    [checkbox setAdjustsImageWhenHighlighted:TRUE];

    // Setup the right view in the text field
    [textField setClearButtonMode:UITextFieldViewModeAlways];
    [textField setRightViewMode:UITextFieldViewModeAlways];
    [textField setRightView:checkbox];

    // Setup Tag so the textfield can be identified
    [textField setTag:-1];
    [textField setDelegate:weakSelf];

    // Setup textfield
    [textField setText:@"Essential"];  // Could be place holder text

}];

[self presentViewController:alertWithText animated:YES completion:nil];

You need to stop the textfield from editing if you purely want that line to be a tick.

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{
    if(textField.tag == -1){
        return NO;
    }

    return YES;
} 

And your action for your button

-(void)buttonPressed:(UIButton*)sender {

    if(sender.selected){
        [sender setSelected:FALSE];
    } else {
        [sender setSelected:TRUE];
    }
}

Here are some tick box images too (there are plenty out there, you could even make a switch and try and animate).