Question

I am adding a button in UIScrollView in StoryBoard

Below is the code i am using.

-(void)addScrollView
{
    for(int i=0;i<[array count];i++)
    {
        UIScrollView *subScrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 400, SUBSCROLLVIEW_WIDTH, SUBSCROLLVIEW_HEIGHT)];
        UITextView *txtVwDetail = [[UITextView alloc] initWithFrame:CGRectMake(342, 0, TEXTVIEW_WIDTH, TEXTVIEW_HEIGHT)];
        txtVwDetail.text = SAMPLE_STRING;
        [self addSubScrollView:subScrollView];
        [self.view addSubview:subScrollView];
        [self.view addSubview:txtVwDetail];
     }
}

-(void)addSubScrollView:(UIScrollView *)aSubScrollView
{
    for(int i=0;i<[array count];i++)
    {
        UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
        aButton.frame = CGRectMake(intBtnX, (aSubScrollView.frame.size.height - 80)/2, 50, 80);
        [aButton setImage:[UIImage imageNamed:[self.items objectAtIndex:i]] forState:UIControlStateNormal];
        **[aButton addTarget:self action:@selector(btnSubImageClicked) forControlEvents:UIControlEventTouchUpInside];**    
        aSubScrollView.contentSize = CGSizeMake(intScrollViewWidth, aSubScrollView.frame.size.height);
        [aSubScrollView addSubview:aButton];
    }
}

In addSubScrollView method I have added Button and its click event which is getting crashed.

-(void)btnSubImageClicked
{
    NSLog(@"btnSubImageClicked");
}

I am having scenario as

MyMainViewController is the sourceViewController for my created customSegue which is the UIStoryboardSegue class

MyMainViewController having a UIView as PlaceHolderView in which I am adding MydestinationViewContoller‘s View which is this Scrollview

-(void)perform
{
    BrowseScreenVC *srcObj = (BrowseScreenVC *)[self sourceViewController];
    UIViewController *dstObj = (UIViewController *)[self destinationViewController];

    for(UIView *vw in srcObj.viewPlaceHolder.subviews)
    {
        [vw removeFromSuperview];
    }

    NSLog(@"dest : %@",dstObj.view);
    NSLog(@"destobj  :%@",dstObj);
    srcObj.currentViewController = dstObj;
    [srcObj.viewPlaceHolder addSubview:[dstObj.view retain]];

}

UPDATE

With answer I also have to change the line
srcObj.currentViewController = dstObj;

to

srcObj.addChildViewController = dstObj;

to make it working

Answer 1

you have to add target as follow:

[aButton addTarget:self action:@selector(btnSubImageClicked:) forControlEvents:UIControlEventTouchUpInside];

@selector(), within these braces you have to provide the method that you want to perform. the “:” represents that the method has some argument. In this case the argument would be the button itself that is calling the method.

You have to implement your method then its signature would look like this

- (void)btnSubImageClicked:(id)sender{
// sender would be the button that is calling the method. you can use this object according to your requirements if you want. 

   // your code 
}

if you want to call this method from somewhere else as well you can call it by passing sender argument nil. e.g [self btnSubImageClicked:nil];