Figure out which button was fired?

[aldcorn@live.com]

Ok,
I hope that I can explain my question properly. I have an number of uiviews that are created programmatically. Each of these views contain a uibutton and a uilabel as subviews.

The uiviews that I create are added to an nsmutable array and then displayed in a uiviewcontroller. All of this is working the way I like; however I am adding a target action to the buttons ( which eventually become subviews of the uiviews that are added to the array) and as of now I am sucessfully firing the actions when any of the buttons are touched. The problem is that it is the same action regardless of the button that is pressed.

What I would like to do is fire a different action for each of the buttons. What would be a good approach to achieve this?

My guess: Each uiview only has one button so I need to either determine which view contained the button pressed or somehow identify which specific button was pressed. Can I give each button or each view an unique identifier when it is created? Then add if statements to my action?

I will run to my computer and post some code in a second.

[aldcorn@live.com]

{
	[super viewDidLoad];
	ARView *arView = (ARView *)self.view;
	
	// Create array of hard-coded places-of-interest, in this case some famous parks
    const char *poiNames[] = {"ONE",
                              "TWO",
                              "THREE",
                              "FOUR",
                              "FIVE",
                              "SIX"};
	
    CLLocationCoordinate2D poiCoords[] = {{40.7711329, -73.9741874},
                                          {37.7690400, -122.4835193},
                                          {32.7343822, -117.1441227},
                                          {51.5068670, -0.1708030},
                                          {45.5126399, -73.6802448},
                                          {40.4152519, -3.6887466}};
                                          
    int numPois = sizeof(poiCoords) / sizeof(CLLocationCoordinate2D);
		
	NSMutableArray *placesOfInterest = [NSMutableArray arrayWithCapacity:numPois];
	for (int i = 0; i < numPois; i++) {
        
        UILabel *label = [[[UILabel alloc] init] autorelease];
		label.adjustsFontSizeToFitWidth = NO;
		label.opaque = NO;
		label.backgroundColor = [UIColor colorWithRed:0.1f green:0.1f blue:0.1f alpha:0.5f];

		label.textAlignment = UITextAlignmentCenter;
		label.textColor = [UIColor whiteColor];
		label.text = [NSString stringWithCString:poiNames[i] encoding:NSASCIIStringEncoding];		
		CGSize size = [label.text sizeWithFont:label.font];
		label.bounds = CGRectMake(20.0f, 20.0f, size.width, size.height);
        
        UIButton *button = [[[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 20.0f, 100.0f)] autorelease];
        [button setBackgroundColor:[UIColor redColor]];
        [button addTarget:self action:@selector(buttonPushed:)
              forControlEvents:UIControlEventTouchUpInside];
        
        UIView *viewMine = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 40.0f, 120.0f)];
            [viewMine setBackgroundColor:[UIColor blueColor]];
        [viewMine addSubview:label];
        [viewMine addSubview:button];
        
        PlaceOfInterest *poi = [PlaceOfInterest placeOfInterestWithView:viewMine at:[[[CLLocation alloc] initWithLatitude:poiCoords[i].latitude longitude:poiCoords[i].longitude] autorelease]];
		[placesOfInterest insertObject:poi atIndex:i];

	}	
	[arView setPlacesOfInterest:placesOfInterest];	
}
- (void) buttonPushed:(id)button {  
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"0" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
}

So in the buttonPushed method how would I check to see which button or view containing the button was touched?

Thanks for your time,
Rob

[aldcorn@live.com]

Can this post be moved to the iOS section?

[aldcorn@live.com]

Added two things:
I assigned a tag to each button as it was created using i:

[button setTag:i];

I adjusted the buttonPushed action:

- (void) buttonPushed:(id)sender { 
    UIButton *button = (UIButton *)sender;
    if ([button tag] == 4) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"tag 4" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
    else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"not tag 4" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
}

Full corrected code below:

- (void)viewDidLoad
{
	[super viewDidLoad];
	ARView *arView = (ARView *)self.view;
	
	// Create array of hard-coded places-of-interest, in this case some famous parks
    const char *poiNames[] = {"ONE",
                              "TWO",
                              "THREE",
                              "FOUR",
                              "FIVE",
                              "SIX"};
	
    CLLocationCoordinate2D poiCoords[] = {{40.7711329, -73.9741874},
                                          {37.7690400, -122.4835193},
                                          {32.7343822, -117.1441227},
                                          {51.5068670, -0.1708030},
                                          {45.5126399, -73.6802448},
                                          {40.4152519, -3.6887466}};
                                          
    int numPois = sizeof(poiCoords) / sizeof(CLLocationCoordinate2D);
		
	NSMutableArray *placesOfInterest = [NSMutableArray arrayWithCapacity:numPois];
	for (int i = 0; i < numPois; i++) {
        
        UILabel *label = [[[UILabel alloc] init] autorelease];
		label.adjustsFontSizeToFitWidth = NO;
		label.opaque = NO;
		label.backgroundColor = [UIColor colorWithRed:0.1f green:0.1f blue:0.1f alpha:0.5f];

		label.textAlignment = UITextAlignmentCenter;
		label.textColor = [UIColor whiteColor];
		label.text = [NSString stringWithCString:poiNames[i] encoding:NSASCIIStringEncoding];		
		CGSize size = [label.text sizeWithFont:label.font];
		label.bounds = CGRectMake(20.0f, 20.0f, size.width, size.height);
        
        UIButton *button = [[[UIButton alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 100.0f, 100.0f)] autorelease];
        [button setBackgroundColor:[UIColor redColor]];
        [button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
        [button setTitle:[NSString stringWithCString:poiNames[i] encoding:NSASCIIStringEncoding] forState:UIControlStateNormal];
        [button setTag:i];
        
        [button addTarget:self action:@selector(buttonPushed:)
              forControlEvents:UIControlEventTouchUpInside];
        
        UIView *viewMine = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 40.0f, 120.0f)];
            [viewMine setBackgroundColor:[UIColor blueColor]];
        [viewMine addSubview:label];
        [viewMine addSubview:button];
        
        PlaceOfInterest *poi = [PlaceOfInterest placeOfInterestWithView:viewMine at:[[[CLLocation alloc] initWithLatitude:poiCoords[i].latitude longitude:poiCoords[i].longitude] autorelease]];
		[placesOfInterest insertObject:poi atIndex:i];

	}	
	[arView setPlacesOfInterest:placesOfInterest];	
}
- (void) buttonPushed:(id)sender { 
    UIButton *button = (UIButton *)sender;
    if ([button tag] == 4) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"tag 4" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
    else {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"not tag 4" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
        [alert show];
        [alert release];
    }
}