UIButton selector not working on mainwindow view

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.userInterac开发者_开发问答tionEnabled = 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];

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.

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;

                }
                }

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.

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.