I have to make a grid with a specific architecture.
I don't know if I have to use a stackView with views? Or a collectionView with cell?
Let's see my image :
Green cells will be repeated infinite times.
Thanks for your help!!
The easiest and best way do make this is collection view, Also in collection views cells(items) are reused, so you don't need to release them after they have disappeared.
It depends on the number of grid cells. If the number of cells is 2~4, it's OK to use stackView.
But
Green cells will be repeated infinite times.
So, you should use collection view. Collection view is suitable for displaying repeating layouts like your image or calendar app on iOS.
And offscreen collection view cell(table view cell also) is reusable, so you only create cells enough to fill the screen and a little more.
See Table View Cell Reuse Explanation
Related
There is a collection view cell and a view of the same size right under it.
Instead of separately adding two circle borders for both the cell and the view, I want to add one for them together (forming a rounded rectangle)
Is this possible?
If yes, how to handle the scrolling of the collection view?
Yes it is possible but tricky.
I'd suggest you really try to combine it into one cell to avoid lots of headaches.
If you can not then you need to toy with the collection view layout to get your cell to line up correctly with the view underneath and you need to figure out the scrolling as you indicate.
I've sometimes had to use two consecutive collection view cells that needed to align and it was terrible to get it right, thus I suggest try to solve this problem using just a single cell. FWIW the last cell in a collection view often shifts slightly compared to the others so I've sometimes added a blank cell last just so my second to last will align correctly.
I want to place a view between cells in a collectionView. Like an ad. to be added dynamically after they see the first 3 cells. Is there a method to do that?
If you could figure out a way to do that you still shouldn't. A collection view owns the area it draws in. It's in charge of placing cells where they belong within it's content view, and you are supposed to keep out.
That said, collection views are extremely flexible and you could design your collection view to display a set of "normal" cells, an ad cell, and then more normal cells. If your ad cells are different sizes or need to be spaced differently than your normal cells then you might have to create a custom collection view layout.
No, you can't. But you can add a UICollectionViewCell which will contain advertisements or something else you want to be added. It is really simple. Just create two prototype cell. First cell will contain your data, second one will contain some extra data.
A question for the UICollectionView experts.
Imagine a collection view that looks like a table view (full width cells), and when you tap on one of them, new cells are inserted underneath that cell that are square cells, say half the width of the collection view, in 2 columns. Tapping the header again would appear to collapse the section.
Keeping in mind that I’m trying to use UICollectionViewFlowLayout instead of a custom UICollectionView.
Would you:
A) implement the tableview style cells as collection view supplementary views (headers), with a gesture recogniser that inserts the square cells?; or
B) implement the tableview style cells as one cell type, and the square cells as another cell type?; or
C) something else?
Personally I would go with option A. In the situation you're describing the full width item is really a section header that's function is to show/hide it's sections's cells.
From a data structure standpoint this is much easier to maintain with this approach. It can be handled with an array of arrays.
If they were all cells it would most likely be one large array, and would be more difficult to make the distinction between a full width cell and the half width cells.
I'm trying to make self resizing cells for my collection view. Ill display text parts and those text parts have many sizes, since every cell will have a paragraph. Reading a guide on appcoda and useyourloaf i got the solution to make it with table view, so the only thing i can't do on the collection view cell is this
self.tableView.estimatedRowHeight
for obvious reasons I can't use it on collection view. Is there any similar thing that I can do for collectionView cells?
PS: I can't change the collection for a tableView.
PS2: I'm using swift
In theory there is; Apple has been claiming since WWDC 2014 that there are self-sizing collection view cells in exactly the same way as for self-sizing table view cells.
But in fact every time I try this feature, my app crashes. So in my view the answer is: no, if you want dynamically sized collection view cells you will have to size them dynamically yourself. This is not difficult, however. Just implement collectionView:layout:sizeForItemAtIndexPath: and set the size of the item. If you want it to be based on internal constraints, call systemLayoutSizeFittingSize: here.
I want to implement a UICollectionView with multiple sections which each section scrolls horizontally and independently like the attached image
I suggest you to use UITableView with customized UITableViewCells with UIScrollView as subview on its contentViews.
There are many samples, for example here
You can use multiple UICollectionViews in table cells. The tableView will scrolls vertically and The collection views can be configured to scroll horizontally by setting particular set of properties which will restrict them to scroll vertically, and they will only scroll horizontally. One constraint to consider is it is much more difficult to do animations that need to move from one table cell to another and you can't use a neat single change of collection view layout to animate all the items in your table view. But if these constraints aren't a problem then this is a relatively easy solution. I also tried it once. It worked for me. Hope that it works for you as well.