Moving subviews in ScrollView

Question

So I have a scroll view with 3 other views as subviews. Using the scroll view to page between the 3 subviews which have their controllers stored in an array.

- (void)viewDidLoad
{  
    [self loadData];

    self.uiScrollView = [[UIScrollView alloc] initWithFrame:self.view.frame];
    [self.uiScrollView setPagingEnabled:YES];
    [self.uiScrollView setContentSize:CGSizeMake(self.view.frame.size.width*3, self.view.frame.size.height)];

    self.uiScrollView.delegate = self;


    [self.view addSubview:self.uiScrollView];

    self.uiPhotoCollectionViewControllers = [[NSMutableArray alloc] init];
    int numberOfOtherViews = 3;
    int subViewOffset = 0;

    for (int i = 0; i < numberOfCollectionViews; i++)
    {
        UIViewController* uiViewController = [[UIPhotoCollectionViewController alloc] initWithData:dataArray];
        // add offset to the view of the controller
        [self.uiScrollView addSubview:uiViewController.view];
        [self.uiViewControllers addObject:uiViewController];
        uiViewController.view.frame = CGRectOffset(uiViewController.view.frame,subViewOffset,0.0f);
        subViewOffset = subViewOffset + uiViewController.view.frame.size.width;
    }

If I later wanted to switch the view in the middle of the scroll view with the first one, how would I go about this without removing all teh scroll views subviews and replacing them.

Unknown Unknown · Accepted Answer · 2013-10-09T04:57:23

Not possible without replacing, but you can do this by swaping the objects in self.uiViewControllers array like this

[scrollView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

and then after swaping the objects you can add subview by traversing the whole array.

Moving subviews in ScrollView

1 Answers