UIButton selector not working on mainwindow view - iphone

Question

I am adding a custom view on main window then on the view i am creating a button and button is showing but the action is not performing on button tapped.
on a button tap i want to open a photogallery.
and in a loop the buttons are created.
code that i am using is there...
UIImage *image=[[UIImage alloc] initWithData:data cache:NO];
UIImageView *iv=[[UIImageView alloc] initWithFrame:CGRectMake(200, y, 75, 75)];
UIButton *button = [[UIButton alloc] initWithFrame:CGRectMake(200, y, 75, 75)];
[button setAlpha:0];
[button setTag:i];//change this to your loop counter
[button addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
iv.image=image;
// iv.tag=#"bigimage.jpg";
iv.userInteractionEnabled=YES;
button.userInteractionEnabled = YES;
[iv addSubview:button];
[button release];
y=y+145;
[view1 addSubview:iv];
[iv release];
And also try this code but no improvements are there.....
UIButton *button=[UIButton buttonWithType:UIButtonTypeCustom];
button.frame=CGRectMake(200, y, 75, 75);
UIImage *img = [[UIImage alloc] initWithData:data];
[button setBackgroundImage:img forState:UIControlStateNormal];
[button addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
button.tag = i;
y = y+145;
[view1 addSubview:button];

Answer 1

The frame of your button should not have the same origin x and y as your imageview. If you want it inside the image view it should have origin x:0 y:0 and the same width and height as your imageview.
The origin x,y is relative to it's parent. In your case the imageview.

Answer 2

Hello Shivangi,
I think you want to set image on button so try this code its will help you
//function to create button dynamically on scrollview
-(void)createButton
{
int Y = 20;
indexRow = 0;
for (int i = 0; i < [prow.noOfPhotos count]; i++)
{
thumbNailButton = [UIButton buttonWithType:UIButtonTypeCustom];
int X = 4 + (78 * (i % 4));
NSLog(#"X = %d",X);
NSLog(#"Start Y = %d",Y);
if (i % 4 == 0)
{
NSLog(#"%d",i);
Y = (70 * verticalImageRowCount);
NSLog(#"Y = %d",Y);
verticalImageRowCount++;
NSLog(#"VerticalImageRowCount= %d");
}
CGRect rect = myScrollView.frame;
rect.size.width = 100;
rect.size.height = Y + 77;
myScrollView.contentSize = CGSizeMake(rect.size.width,rect.size.height);
thumbNailButton.frame = CGRectMake(X,Y, 62,65);
view = [[UIImageView alloc] init];
prow.photo = [prow.noOfPhotos objectAtIndex:indexRow];
imagePath = prow.photo;
asyncImageView = [[[AsyncImageView alloc] initWithFrame:CGRectMake(4, 0, 62, 65)] autorelease];
asyncImageView.backgroundColor = [UIColor clearColor];
[view addSubview:asyncImageView];
NSURL *url = [NSURL URLWithString:imagePath];
[asyncImageView loadImageFromURL:url];
[view setImage:[UIImage imageNamed:[prow.noOfPhotos objectAtIndex:i]]];
thumbNailButton.tag = i;
thumbNailButton.backgroundColor=[UIColor clearColor];
[thumbNailButton addTarget:self action:#selector(imageClicked:) forControlEvents:UIControlEventTouchUpInside];
[thumbNailButton addSubview:view];
[myScrollView addSubview:thumbNailButton];
indexRow+= 1;
}
}

Answer 3

Try putting an NSLog in your buttonPressed: and see if that method is getting called. Maybe the method is getting called but the Photo Gallery app isn't launching for some other reason.

Answer 4

The user cannot click the button if you set the button's alpha to 0. This means the event will not be fired.
[button setAlpha:0];
This has the same effect as setting button.hidden = YES.
If you want an invisible clickzone using the button, set the button type to UIButtonTypeCustom and it should do the trick.