I have a UITableView within my UIViewController.
I want the table to scroll to the top when the status bar is pressed. i've tried self.tableView.scrollsToTop = YES but it does not scroll the table to the top.
Any idea on how to make this work?
Looking at the documentation for UIScrollView, scrolls to top, there is a special consideration: "on iPhone, the scroll-to-top gesture has no effect if there is more than one scroll view on-screen that has scrollsToTop set to yes."
This could be part of the issue, without seeing your actual code.
Another technique you might employ since it sounds like a uitableview nested inside a view controller, is to call scrollToRowAtIndexPath:atScrollPosition:animated:
So, detect when status bar is pressed, then call [YourTable scrollToRowAtIndexPath:probably0 atScrollPosition: UITableViewScrollPositionTop animated:YES/NO];
Related
so, the setup looks like this:
I want to have one navigationbar and three collectionViews. I want to be able to horizontally scroll through the collectionviews and on vertical scroll the navigationBar large title animation should trigger as well.
What I have tried:
My first try was to create one horizontally.scrolling collectionView with cells having the size of the whole view and in each cell there would be another collectionView that would scroll vertically. Now, that worked great for my purpose but the large title stayed the same size - which, as I understand, is because it does not receive any vertical scroll events since my collectionViews for vertical scrolling are embedded in main collectionView.
It looked like this: https://giphy.com/gifs/50hYRx71XSdYA/html5
Then I tried a different approach. I created pageViewController and two viewControllers both with one vertically-scrolling collectionView. And ... it did not work either. This time if there was pageCurl animation, the navigation title DID animate - but I do not want a pageCurl animation, you can see that here: https://giphy.com/gifs/jFmOpEtUOyxtC/html5
Changing the animation to .scroll just disabled the title animation: https://giphy.com/gifs/l0IsGVhKKb0lzomqc/html5
I can not find a way to do this, do any of you have any idea?
Thanks!
Unfortunately the new self-collapsing navigation bar is using some private Apple-magic in the background to hook into the top-level scroll view of the view controller, therefore you cannot use this mechanism the way you've described.
I've have been trying for a while now, to implement a specific behavior in my app. On the initial view of my app, there must be a logo(imageView), a label and a textField. It should be possible to scroll down from the initial view, to a tableView. while the user scrolls down, the label in moved up in the window, to form a search field for the tableView. Then the scrollView should lock to the part with the tableView, and it should only be possible to scroll back up, if dragging elsewhere than the tableView.
What is best practice for doing as described?
The image show (only for illustration, i havn't been using story board when trying to implement it) an overview of the problem:
The way I've tried to do this so far, is by embedding the tableView in a scrollView (as seen on image), enabling paging on the scrollView, and than disabling scrolling on the scrollView, when the buttom part has been reached. I've added a gesture reconizer on the part with of the screen with the textField.
These two posts (Scrollview with embedded tableview and Use Pan Recognizer to Control ScrollView) descripe i further detail what i've tried so far.
But the question is more to, is there an alternate solution for making behaviour descriped above?
Maybe interactive animated transitioning between view controllers somehow?
YES there are! Implement a table view with a header view. And remove the scroll view.
self.tableView.tableHeaderView = topView
where topView will be the view wish as the UIImage, the label and textField
I am currently using the https://github.com/telly/TLYShyNavBar class to hide my nav bar when scrolling, it works great and is extremely simple to use. But I am using it on a table view controller so when I scroll up my section headers don't move and it looks like this.
How can I move up the section headers to the top of the screen. Or use a different way to move the nav bar when scrolling.
Thanks for the help in advance.
You could use the first TableViewCell as a custom navigation bar by adding buttons to the contentview contained in the TableViewCell. It would scroll up like any other TableViewCell. TableViewCells are mostly just a wrapper for a UIView. You can modify that UIView like any other UIView. Every TableViewCell has a property called contentview which is the main UIView in the Cell.
As an example, you could add a button to the first cell that sends the following message
[self.navigationController popViewControllerAnimated:YES];
You could call that button "Back"
https://developer.apple.com/library/IOs/documentation/UIKit/Reference/UITableViewCell_Class/index.html#//apple_ref/occ/instp/UITableViewCell/contentView
I found a solution for this!
The problem is that, the section header stays at the top value of the contentInset. Even though the navigation bar is out of view and the tableView is visible below, the contentInset will remain same.
You would have to modify the library to increase or decrease the top value of the contentInset, according to the scrolling offset. Try this out and you may post it as a pull request in github.
Hope this helps! :)
Here is the problem that I'm facing. I have UITableView inside main view. When user taps menu button, view is added to the view hierarchy of superview, and this view covers all screen, except the menu button. That is I call
[self.view insertSubview:self._menuView belowSubview:self._menuButton]
After user clicks the menu button again I call
[self._menuView removeFromSuperview]
However, after this, the UITableView stops scrolling, actually it scrolls, but just a little, couple of pixels, and then bounces back to the location on which it was before I inserted _menuView. I've monitored the menu hierarchy after inserting and removing the _menuView, it is actually removed, and also there is no view which covers the UITableVIew, so there is no chance that some other view steals touches from UITableView. What can be the problem? Any ideas?
EDIT 1: I've noticed besides not being able to scroll, another strange thing happens. When I show menuView, the tableView is scrolled to top, without animation. (the menuView is half opaque only, so I can see the tableView underneath it)
EDIT 2: I've monitored contentSize and contentOffset of tableView before and after inserting _menuView, the reason for not being able to scroll is that somehow contentSize is being changed.
TABLE VIEW BEFORE INSERTING MENU - contentSize:{Width=320, Height=10519} contentOffset:{X=0, Y=3980}
TABLE VIEW AFTER INSERTING MENU - contentSize:{Width=320, Height=44} contentOffset:{X=0, Y=0}
As You can see, the height is changed to 44 that's why I'm not able to scroll. And Also, as I've said in EDIT 1: tableView is scrolled to top - so as you can see contentOffset is also zeroed. Any ideas why content size changes automatically?
Thanks in advance.
i think there is problem with your tableview frame. right after removing subview, try to set frame of your tableview at its original frame.may this will solve your problem
Content in the UITableView organized automaically and designed only to show cells & header/footer elements. To proper working you should wrap your table into parentView and add your menu to that parentView rather than to the UITableView. You can also try to call reloadData method on table since it can restore the content size of the view.
This should be a fairly general question, but I have a view in which I placed a UITableView and implemented it properly. It works well and it scrolls. But I want to add a UISearchBar attached to it so that it will scroll along with the table. But when I add the search bar onto the tableview it shows up, but the tableview will not scroll anymore. I don't actually need any input into the search bar, and I disabled user interaction. Is there any way to add the search bar (no need to implement it) and have it scroll?
(I will rate up anyone who answers!)
Thanks
The UISearchBar should be the UITableView's header view.
Had similar issue even when IB had the correct bouncing properties enabled.
In your viewDidLoad, set self.tableView.alwaysBounceVertical = YES;.