2 button UIAlertView - which button was pressed?

trifusion · 08-25-2008, 11:33 PM

Can someone please post a simple example of how to do an alert (UIAlertView) with an OK and Cancel button and how I could simply change detect which button was pressed?

When I read the docs it would appear that I may have to create a UIAlertView delegate and being a Cocoa newbie I am not sure how to go about doing that.

I can display the alert with two buttons using:

Code:

		UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title" message:@"AThe message."  delegate:self cancelButtonTitle:@"button 1" otherButtonTitles: @"button", nil];
		[alert show];
		[alert release];

But how do I determine which button was pressed?

Thanks

Greg

Scuba · 08-26-2008, 12:09 AM

Look up UIAlertViewDelegate in your documentation, its all in there. Basically you just declare the proper method and it will get called for you passing in the button index.

Stitch · 08-26-2008, 01:59 AM

This is taken from the UICatalog sample code.

Insure your header file contains the following:

Code:

@interface YourViewController : UIViewController <UIAlertViewDelegate>

Then just add the following in the class you need the alert:

Code:

- (void)alertOKCancelAction {
  // open a alert with an OK and cancel button
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"UIAlertView" message:@"<Alert message>" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
  [alert show];
  [alert release];
}

and

Code:

- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
  // the user clicked one of the OK/Cancel buttons
  if (buttonIndex == 0)
  {
    NSLog(@"ok");
  }
  else
  {
    NSLog(@"cancel");
  }
}

trifusion · 08-26-2008, 06:20 AM

Stitch,

Thank you for the sample code and how to info, that is just what I was hoping for.

Greg

reetu.raj · 02-17-2009, 02:20 AM

thank you so much for this info !

sohel62 · 08-23-2009, 06:38 AM

Thank for the post, header file information was useful for me.
I was missing that.

Quote:

Originally Posted by Stitch

This is taken from the UICatalog sample code.

Insure your header file contains the following:

Code:

@interface YourViewController : UIViewController <UIAlertViewDelegate>

Then just add the following in the class you need the alert:

Code:

- (void)alertOKCancelAction {
  // open a alert with an OK and cancel button
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"UIAlertView" message:@"<Alert message>" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"OK", nil];
  [alert show];
  [alert release];
}

and

Code:

- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
  // the user clicked one of the OK/Cancel buttons
  if (buttonIndex == 0)
  {
    NSLog(@"ok");
  }
  else
  {
    NSLog(@"cancel");
  }
}

youngcoder · 12-11-2009, 04:02 AM

i am doing this:

Code:

- (IBAction)showCheat
{
	{
		
		
		UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Warning!"
														message: @"Are You Sure you Want to See the Answer? Beware it Takes 3 Points Away From your Grade"
													   delegate: self
											  cancelButtonTitle: @"Cancel"
											  otherButtonTitles: @"OK"];
		[alert show];
		[alert release];
	}

	- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
		// the user clicked one of the OK/Cancel buttons
		if (buttonIndex == 0)
		{
			NSLog(@"Ok");
			
			UIAlertView *alerttwo = [[UIAlertView alloc] initWithTitle: @"Warning!"
															   message: solutionText
															  delegate: self
													 cancelButtonTitle: @"Cancel"
													 otherButtonTitles: @"OK"];
			[alerttwo show];
			[alerttwo release];
			
		}
		else
		{
			NSLog(@"Cancel");
		}
	}
		
}

but get the following errors on the red line:
Wrong type argument to unary minus
expected ';' before ':' token

thanks for any suggestions

anurag · 12-23-2009, 01:55 AM

Quote:

Originally Posted by youngcoder

i am doing this:

Code:

- (IBAction)showCheat
{
	{
		
		
		UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Warning!"
														message: @"Are You Sure you Want to See the Answer? Beware it Takes 3 Points Away From your Grade"
													   delegate: self
											  cancelButtonTitle: @"Cancel"
											  otherButtonTitles: @"OK"];
		[alert show];
		[alert release];
	}

	- (void)alertView:(UIAlertView *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
		// the user clicked one of the OK/Cancel buttons
.........
		
}

but get the following errors on the red line:
Wrong type argument to unary minus
expected ';' before ':' token

thanks for any suggestions

As far as the above code is concerned, the method - (void)alertViewUIAlertView *)actionSheet clickedButtonAtIndexNSInteger)buttonIndex { is declared inside another method (IBAction) showCheat.

You should add a curly bracket } before the definition of the method -(void)alertView .....

Hope this helps.

rooster61 · 08-14-2010, 07:55 PM

thx

wuf810 · 08-14-2010, 07:56 PM

Quote:

Originally Posted by rooster61

please supply how to call this?

Please supply a question that makes sense.

Knodel · 09-09-2010, 01:59 PM

Hi!

I also have a problem with two UIAlertViews. Basically, I need to do the same thing as the topicstarter did, but I have two UIAlertViews.

Thanks in advance!

Desdichado · 09-09-2010, 02:12 PM

I had this problem recently. I ended up using tags:

Code:

  alert1.tag=1;
  alert2.tag=2;

and then in the delegate method:

Code:

  if (actionSheet.tag==1) {

   //check buttonIndex value and do something
  }
  else if (actionSheet.tag==2) {
   //check buttonIndex value and do something different
  }

Knodel · 09-09-2010, 02:17 PM

Thank you!

PolishDemon · 09-09-2010, 08:41 PM

I don't think you guys need to change the tags. If you're used to it, fine, but I'm pretty sure you can do this w/o any problems:

Code:

//Two alert views named alertOne and alertTwo
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
     if(alertView == alertOne) {
          //do custom code for first alert view
     }
     else if(alertView == alertTwo) {
          //do custom code for second alert view
     }
}

I'm pretty sure this would work. If I'm wrong, feel free to correct me. I'm learning just like many others on this forum are!

Desdichado · 09-10-2010, 09:18 AM

Quote:

Originally Posted by PolishDemon

I don't think you guys need to change the tags. If you're used to it, fine, but I'm pretty sure you can do this w/o any problems:

Code:

//Two alert views named alertOne and alertTwo
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
     if(alertView == alertOne) {
          //do custom code for first alert view
     }
     else if(alertView == alertTwo) {
          //do custom code for second alert view
     }
}

I'm pretty sure this would work. If I'm wrong, feel free to correct me. I'm learning just like many others on this forum are!

Yes, that would work, but only if alertOne and alertTwo were ivars in your class.

Code:

@interface MyClass: NSObject {

    UIAlertView *alertOne;
    UIAlertView *alertTwo;
}

If you create alertOne inside your method, the delegate method has no reference to that pointer.

Code:

- (void)myMethodToAlertUser {

    UIAlertView *alertOne = [[UIAlertView alloc] initWithTitle:@"Title" message:@"AThe message."  delegate:self cancelButtonTitle:@"button 1" otherButtonTitles: @"button", nil];
    [alertOne show];
    [alertOne autorelease];

}

PolishDemon · 09-10-2010, 02:27 PM

@Desdichado - You are absolutely correct. I didn't consider the option of creating objects mid-method. Thanks for the correction!

simontheu · 02-24-2011, 10:10 AM

Quote:

Originally Posted by Desdichado

I had this problem recently. I ended up using tags:

Code:

  alert1.tag=1;
  alert2.tag=2;

and then in the delegate method:

Code:

  if (actionSheet.tag==1) {

   //check buttonIndex value and do something
  }
  else if (actionSheet.tag==2) {
   //check buttonIndex value and do something different
  }

Tags seem like a bit of a bodge, is there a more correct way?

**baja_yu** · 02-24-2011, 12:24 PM

No.

jNoxx · 02-25-2011, 06:24 AM

Quote:

Originally Posted by baja_yu

No.

U and Brian allways make my day, with posting Answers like these.
Keep going ^_-

or I mean.

Quote:

Yes.

sagarpatel · 08-01-2011, 09:15 AM

Can someone please post a simple example of how to do an alert (UIAlertView)
with login.. like username and password whenever username and password wrong at that time alert will appear..

I am new in iphone development...

Thank you..

Sagar Patel

mavrik5150 · 08-01-2011, 03:03 PM

Below is an example on how to create a UIAlterView with a single Text Box, if you want two text boxes then you will need to adjust and add what you need to make both fit. Also, I found it easier to make the TextBox an ivar, this way I can use the self delegate to grab the text that was entered after the Update button was pressed, this should get you on the right path:

Code:

UIAlertView *optionAlert = [[UIAlertView alloc] initWithTitle:@"Update Monthly Goal" message:@"this message gets covered" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Update", nil];
    optionText = [[UITextField alloc] initWithFrame:CGRectMake(12, 45, 260, 25)];
    [optionText setBackgroundColor:[UIColor whiteColor]];
    NSString *placeholder = [NSString stringWithFormat:@"$%@",MTDGoal];
    optionText.placeholder = placeholder;
    optionText.keyboardType = UIKeyboardTypeNumberPad;
    optionText.keyboardAppearance = UIKeyboardAppearanceAlert;
    optionText.tag = 10;
    optionText.delegate = self;
    optionAlert.tag = 25;
    [optionAlert addSubview:optionText];
    [optionAlert show];
    [optionAlert release];

I'm also using the alert tag to determine which UIAlertView is present since this screen that I pulled this from has 2 other Alerts that show up depending on the WebService that is sending data (such as a Timeout Message from the DB).