I have a UIViewController with a UIScrollView. The top half of the screen contains some labels and text fields. The lower half of the screen is the UICollectionView. The UICollectionView is embedded within the scrollview so that when the user scrolls down they are not limited to a half screen size collection view.
The collection view is presenting properly and the delegate is set as I've done countless times before.
I've purposely tested different solutions and if the collection view is added 'directly' to the UIViewController the didSelectItemAtIndex delegate method is called. When the collection view is added to a scrollView within the ViewController I get no response from the delegate method.
I have checked the Debug View Heirarchy and the ScrollView content size is sufficient to house the entire collectionView. The Debug view also shows the correct view as the UICollectionViewDelegate.
Any help would be appreciated.
Having written the question I worked out my issue.
As part of the layout within the first half of the screen, I have a UITapGestureRecognizer added to the UIScrollView to endEditing() should the user click outside of a UITextField. This tap gesture was receiving the tap and 'ending it' before it was passed to the UICollectionView.
Related
I'm developing an app and I need a view with these elements:
- UITableView
- UITextField and UIButton
- TabBar
As you can guess, I am developing a chat, but when I put the elements in the .xib, I can't show de layer: UITextField and UIButton. If I put them without a view, they dont appear.
If I put a view under the table, and in that view I put the text and the button I get this error: http://pastebin.com/CKfxijz9 (I put the error there because it's to long)
Thanks in advance
There are some ways of dealing with that, depending on how it should behave. Some of them are:
Provide a table footer or header view that holds the button and
the text field.
Nest the table view into another view. The table
view and the view containing the button and text fielt are on the
same level within the view hierarchy. They are rather siblings than
sub- and superview to each other.
Use a UISlider instead of a table. (However, I personally would use the table.)
Here's an approach I've used in the past (not sure if it's best practice, but it works).
Add your button and textfield to a new view (let's call it, bottomView)
Add bottomView to the superview of your tableview
Set the frame of your bottom view so that it fits to the bottom of the screen (this will make it so your tableview will scroll, but keep your bottomView always attached to the bottom of your mainview)
I'm trying to add a UIView on top over the UITableView to mimic the iPhone Facebook style menu. I have it working fine by making the controller a UIViewController then adding a tableview however I am unable to make the menu a static menu unless the controller is a UITableView.
Is it possible to add a view ontop of a tableview and only make the tableview in the background scrollable without the view in the foreground scrolling?
Here is what I have with the subclass being UIViewController
But I am unable to make the tableview cells static via IB since it is not a subclass of UITableView Controller.
EDIT per NSJones Code:
It seems to be going somewhat in the right track. However the view still blocks the table. If I remove the view from the storyboard it will only display the table.
You can make a view hover the same way you make any real thing hover; Hold it up with something invisible.
Basically what you want to do is create a clear UIView (with user interaction disabled) that is the size of your view controller's view, and add it as a subview to your view controller's view property. That way it sits invisibly on top. then you can add a subview to that clear view and that subview won't move.
Edit:
It seems this nice clean approach won't work for you since you need your view controller to be a UITableViewController. The answer for this slightly more complex approach is to use a delegate method for UIScrollView which also works for UITableView. Apple has a fantastic demo of this concept in the WWDC2011 - Session 125 - UITableView Changes, Tips, Tricks video. If you can watch it I highly recommend it. The meat of this issue begins at about 36:10.
But to sum it up you implement the scrollViewDidScroll: delegate method. And handle the movement of the tableview by adjusting the position properties of the view. Here I am keeping an UIView property named viewToKeepStill still using this method.
-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
// CGFloat stillViewDesiredOriginY; declared ivar
CGRect tableBounds = self.tableView.bounds; // gets content offset
CGRect frameForStillView = self.viewToKeepStill.frame;
frameForStillView.origin.y = tableBounds.origin.y + stillViewDesiredOriginY; // offsets the rects y origin by the content offset
self.viewToKeepStill.frame = frameForStillView; // set the frame to the new calculation
}
Instead of adding it as a subview of the table view, add it as a subview of the superview of the table view; that way it won't scroll.
So instead of this:
[tableView addSubview:viewController.view];
Do this:
[tableView.superview addSubview:viewController.view];
Assuming you want something that is visible full-time with the table, start with a view which contains both the menu view and the UITableView. Make the table smaller so it ends where the menu view begins. The table view can work with less vertical space.
If you have your UIViewController's view to be your table view then your table is going to span over the whole screen, so you won't be able to add anything on top of it.
Why not try the following:
1) create a new UIViewController
2) add a view on top where you want your menu
3) in the space left under just drag a table view from the component library
4) don't forget to set the 2 table view delegates to be your view controller class
that's about it?
I have a UITableView inside of a scrollview. I load the datasource from internet content in the background, then call "reloadData". But, it loads EVERY cell. As far as I know, it is supposed to load the cells as they appear onscreen. What is going on?
I guess it happens because a UIScrollView itself does not take care of figuring out which subviews to be shown or not, thats up to a subclass or a delegate.
From: http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScrollView_Class/Reference/UIScrollView.html
The object that manages the drawing of content displayed in a scroll view should tile the content’s subviews so that no view exceeds the size of the screen. As users scroll in the scroll view, this object should add and remove subviews as necessary.
And if you add a table view inside a scroll view I think the table view will load as many cells as needed to draw its bounds without knowing which parts of it that really is on the screen.
Harrr pirates!
I'm trying to make a data entry screen using a UITableViewController. It contains a grouped table view with two sections, each with a few (2 and 4) rows with a UITextField inside them.
When any of the UITextFields become first responder they scroll into view automatically. Great, you would say, but I want to scroll the whole section into view, not just the row containing the UITextField that became first responder.
I don't allow the user to scroll the UITableView by hand and I know to what position it should scroll to display correctly. However, I can't get my UITableViewController to stop automatically scrolling the UITextField into view for me.
Searching StackOverflow I can find a lot of questions about how to resize the UITableView when the keyboard appears, but this doesn't stop the automatic scrolling.
Any suggestions? Your help would be much appreciated!
TableView is basically an extension of scrollView therefore if you want to do the scroll yourself you should use the scrollview API.
Set the contectSize property to the size of the screen without the keyboard and the contentOffset to the location on the table you want to scroll to
is there a possibility to determine if an uiview obj is going to be displayed. imagine: you have 2 uiviews in an uiscrollview. now you are going to switch per gesture from the first view to the second. the first view now is NOT in the viewport. now you are going to go back to the first view. and now I want to be notified that this view is in viewport, or is redisplayed. the same has to be for the second view. I have not found any callback or something like this.
You make sure your UiViewController overrides viewWillAppear: (before it appears this method is called) or viewDidAppear: (after this method is called).
See: http://developer.apple.com/iphone/library/documentation/uikit/reference/UIViewController_Class/Reference/Reference.html#//apple_ref/occ/instm/UIViewController/viewWillAppear:
That depends what you mean by "switch". If one view is just scrolled out of the visible area of the scrollview, but still remains attached as a subview to it, then you may want to check if the bounds of your view overlap those of the scrollviews visible area.
You could do this by using UIScrollView Delegate's scrollViewDidScroll: method to implement a check for overlaps while the user is scrolling.
If however your view is actually removed from the viewstack, then you may want to subclass UIView and implement willMoveToSuperview: to check if the view has been added to the scrollview again.