Here is a part of the AirBnB app I would like built.
Here are the 3 questions that I'm in need of advice on.
How do i get a cell on a UITableView to act like the [ MORE FILTERS ] button? The button seems to act like a UITableView cell that always stay at the top. YET, it fades away just before going out of scope. Is this even a tableViewCell?
The view [ARRIVES | DEPARTS]. What view is this on a UITableView? When the tableView is scrolled all the way to the top it connects seamlessly with the [MORE FILTERS] button making it seem like its one view. But when the tableView starts scrolling, the [MORE FILTERS] button can be seen sliding over it as it fades away.
What is the [SHOW FILTERS] button? Is it a UINavigationItem titleView property or some separate view? As the table scrolls up it can be seen attaching itself to the UINavigationBar in a fade transition. At first i thought it was a just a UINavigationBarItem, but I do not know how to add items under the title of the bar. Any clarification on what this is or how can be accomplished?
I have already looked at Apple's Example on customized UINavigationBar, but it doesnt provide any clues to accomplish this. Any help appreciated
just like you did, when I came across an application like this one which has cool UI effects and animation, I would like to analyse and if possible try to do the same effect by myself, so that I could get innovations as well as knowledges.
Let's analyse it first, at the meantime you will probably find all the answers. I just drew a graph which shows the UI hierarchy of the screen, of course this hierarchy is based on my analysis, I cannot guarantee that the hierarchy is 100% correct.
I will do a bit of explanations here. From top to bottom:
1. The Navigation Bar(Red), just a opaque navigation bar, nothing special;
2. The Show Filters View(Purple) is a view which anchors to the bottom of the Navigation Bar(Red), and it is hided when the screen launches. Please note that this view is not a subview of Arrives & Departs View(Blue). It is added directly to the view controller's root view. Which means Purple and Blue are siblings;
3. The Arrives & Departs View(Blue), nothing special;
4. The More Filters View(Green), nothing special;
5. The Table View(Orange), nothing special;
So from my analysis, Purple, Blue, Green and Orange are all siblings.
Now let's move on to the fancy UI effects and animations. The trick here is you need to observe the change of the table view's contentOffset (I recommend to do it in the scroll view's delegate - scrollViewDidScroll), and move, hide or show the views accordingly. There are four stages:
1. The initial stage, like the graph above.
2. The Blue starts fading out, Green moves up as the finger moves, Orange increases its height. (Purple is still at the same position and hided, I just removed it from the graph in order to make it clearer);
Blue totally faded out, Green starts fading out and Purple starts fading in. Orange is still doing the same - increasing its height;
Green totally faded out, Purple totally faded in and Orange increases its height to fill the screen and then anchors to the bottom of Purple.
The [MORE FILTERS] button does appear to be a cell of the UITableView. Since it is a different type of cell than the other cells containing the UIImageView and the UILabels using a different identifier you can tell the cell to fade away with an animation. Try this link for more information.
The [ARRIVES | DEPARTS] seems to be its own view. I believe that this and the tableview are both part of a UIScrollView. This is the reason that it seamlessly disappears when the [MORE FILTERS] cell scrolls up towards it.
The [SHOW FILTERS] button could just be a part of the navigation bar. When the scrollView finishes scrolling the navigation bar can be extended. However, it is also possible that the button is in a view of its own and is hidden until the scrollview finishes scrolling. Either way should be possible but I would recommend putting it in its own view rather than attaching it to the navigation bar.
Related
A picture is worth thousand words in this case. I have a tableview present modally onclick from other view controller (with one navigation controller in between for the navigation bar, if that is important to you). Somehow there is some strange, (1) gray space at the top right under the navigation bar overlapping on top of the tableview, and (2)gray space near the bottom of the tableview right below the last cell with button, as shown in cap screen. I have completely no idea what that is.
I have another project which I use almost completely same setting for the tableview and these two gray bars do not occur. So I feel quite strange as to how that happen.
Can anyone enlighten me on this? I don't even know how to call these two gray bars here.
If scroll to top, the two problematic areas appear a bit differently, please see can screen below. It feels like something due to a same problem which I don't know what it is.
I have my swift 5 app working and I'm now adding a 'tool tips' feature, explaining what each part of the screen does.
The approach I have taken is from an article online - add a subview of grey to dim the background, then to that, add a subview of the item being described again, so it is now highlighted, then also, add a subview of an explainer bubble to explain the item highlighted.
This works fine, so long as the UIView I'm using isn't from a UIBarButtonItem. When it is, the bar buttons underneath the grey screen move around to accomodate what they believe is another bar button being added, which causes everything to miss-align. Other buttons do not have this problem, only UIBarButtons.
Any advice is greatly appreciated. Thanks.
Are you adding the duplicate subview to the bar itself? It'd probably be better to add it to the screen rather than the bar so it doesn't affect the bar's layout. In order to get its frame relative to the view controller so you can display your duplicate in the correct position, you could use:
barButtonItem.convert(barButtonItem.bounds, to: self.view)
Assuming self is a UIViewController.
I am trying to add a UIImageView to the back of a navigation bar.
The reason is because I want to create a UITableView whose navigation bar is actually a picture (with back button on the left) but I want the picture to scroll with the tableview and when the picture is fully scrolled out. The navigation bar is shown as per normal.
My solution to this problem:
Add a UIImageView to the top of the UITableView and make the navigation bar transparent. Set a contentOffset for the UITableView which is a subclass of UIScrollView so that when the view is presented, it looks like the picture is filling the navigation status bar.
Problem:
If I scroll up, instead of bouncing back, the transparent status bar is shown (with a color of the background as it is transparent).
Possible way to solve this new problem:
I was thinking of trying to limit the ScrollView size to get around with problem but failed.
So I feel is it possible to add the UIImageView to the "back" of the navigation bar so that it is there without any offset? Since that way, my life will be much easier.
Any suggestions on solving this or another new approach to get the same UI/effect?
Related question.
I would do this by adding either a table header or cell at the top of the table which contains your image.
Create the table view so that it extends all the way to the top of the screen. Extend Under Top Bars option. I have not done this with a UITableViewController but I have done this with a UITableView embedded inside a UIViewController's view with the top constraint set to 0 for the view rather than the top layout guide.
Now when you run this your table will fill the whole screen and the top header or cell will be at the top showing your picture.
When you scroll you can either use the UIScrollViewDelegate to detect the movement or implement tableView:didEndDisplayingCell:forRowAtIndexPath:
I'm not 100% sure when you want the navigation bar to go non clear. If its when the image goes off screen then didEndDisplayingCell should be good. If its when the cell bottom passed under the bottom of the navigation bar then scroll view might be your only option.
This will also bounce as you expect when you pull down and it should snap back to the top.
Hope this helps.
I am trying display a UITableView within a larger UIView in an iPad app, mainly because the data is pretty sparse and I'd like to have the table be a smaller area over a background image, rather than taking up the whole screen. The parent UIViewController is correctly set as the table data source and delegate, and the table looks/functions like it should. The whole view is embedded in a navigation controller; the overall UIView shows a navigation bar, as it should, that I can configure normally.
The problem is the UITableView subview also shows blank space at the top for a navigation bar--empty space above the first cell--and I can't figure out how to get rid of it. I know the space is related to the navigation controller, because when I delete the embed link in the storyboard, the space goes away. The table view doesn't present a UINavigationBar property or any other navigation-related properties that I can try to nullify.
I would post a screen shot but I don't have the rep yet.
Can anyone explain where the space is coming from and how to nix it?
I suspect the answer is related to the Top Layout Guide for the view, but I can't diagnose the specific problem.
Here's a workaround from the storyboard: Insert a UIView in the scene, then drag the UITableView into it as a subview. Check the box for the new UIView's "Clip Subviews" in the attribute window, and then use it as a mask, basically, to cover the undesired top margin of the table view. It works and doesn't require any coding, but there has to be a better way.
I have a requirement for a very simple Button Bar.
It should take up the width of the screen.
It should allow at least 3
buttons.
The buttons should be of equal width and together take up
the whole width of the bar.
Each button should be tappable, but not
have a selected state.
The bar will be overlaid on a MapView and positioned directly above a TabBar.
Tapping a button will launch a Modal ViewController.
I thought about using a UITabBar and not allowing its tabs to become selected, but the HIG is pretty clear that this is not correct usage and UIToolBar doesn't allow the button widths to be set.
This seems like a very simple requirement but I can't see an obvious solution. Is there something I'm missing? Can anyone suggest a solution?
What's wrong with just creating a simple view that draws an appropriate gradient, and then adding three buttons of the appropriate size?
If you're feeling ambitious, or if this is something that you're likely to use more than once, you could even have the view create the three buttons. Call it ThreeButtonBar or something. Give it a constant height and adjust the width to match that of its superview so that you can use it in portrait or landscape orientation.