Another problem - can't change UITableView height dynamically. If I change it in xib, it doesn't reduce when it is needed. Stupid problem, but can't resolve it for a whole day.
So, when contentSize is less than initial tableView height, it must reduce tableView height. If contentSize is more than initial tableView height, it must increase tableView height.
My code is here: https://github.com/serg1991/diplom_newbase/blob/master/diplom/BiletChildViewController.m
Related
I have a tableView which I want to size dynamically in height depending on how many cells are there (and to pull/push all views underneath it)
I've tried to archieve this by putting it in a StackView, but TableView content doesn't show unless I give it a fixed height constraint, which is opposite of what I'm trying to do.
Also tried this Swift dynamic tableview height based on content with no change, as the comment from OP said too.
Thanks in advance.
Set table frame or table height Constraint outlet with table content size means set the table view height constraint equal to its content size after the table view has done the loading.
tableHeightConstraint.constant = tableView.contentSize.height
This illustration shows what i'm trying to do:
The green list is the UITableView where it dynamically adjust it's height based on the number of items inside of it.
Underneath of the UITableView is a button that should follow the UITableView whenever it changes it's height size.
The UIButton should always be beneath the UITableView whatever the size of the UItableView.
I'm currently using autoresizing for UITableView
I have tried to use Autolayout but it seems i can't still find the answer.
i currently have no constraints in the layout.
This boils down to calculating the height of the table view that perfectly fits the cells. Basically you need to measure the size of every cell, then create a height constraint on the table view, and set its constant to the sum of the cells' heights.
Measuring the height of cells is tricky thought. If you only have a few cells (like in your illustrations), you can just instantiate all of them, keep them in an array and use systemLayoutSizeFittingSize to calculate their sizes. If you use multi-line labels, it is also important to set their preferredMaxLayoutWidth to appropriate values.
However, if you have only a few cells (and so cell reuse is not important), stack view is probably a better choice than table view. It's just too tricky to calculate the perfect height of a table view.
I've successfully created UITableView with custom cells (automatically sized) that contain a label and UITextView - detailsTextView.
When scrolling of detailsTextView is disabled, the cells are properly resized according to textView's text.
I don't want, however, to have extremely large cells and set maximum height of a cell (and enable scrolling for detailsTextView when it reaches max cell height).
How can I achieve this?
When enabling scrolling for detailsTextView autoresizing of cells shrinks it to 0 height (overriden by min. height constraint in IB), but still it does not fill my planned maximum size of cell.
override func viewDidLoad() {
mainTableView.rowHeight = UITableViewAutomaticDimension
mainTableView.estimatedRowHeight = 200
self.mainTableView.register(UINib.init(nibName: EventCell.nibName,
bundle: Bundle.main),
forCellReuseIdentifier: EventCell.cellIdentifier)
...
}
The idea is simple. You need to keep track of UITextView's height change in textViewDidChange method.
Then if UITextView exceeds your maximum predefined height then you are gonna add a constraint which restrict the UITextView's height growth. Constraint should be something like setting minimum height of UITextView to your maximum predefined height and enable the scroll for UITextView.
If you use only auto layout, UITextView can define it's own size only if scrolling is disabled, unfortunately.
You should try to avoid recursive layout passes (e.g. when text view's height changes, then install more constraints, this will cause the height to change again, etc, etc).
What you can do is limit maximumNumberOfLines of your textView, and provide other ways to see the full text: as it was pointed out, it is a very bad UX practice to have a scroll view within another scroll view.
From a UI/UX standpoint I wouldn't do that what you are trying to do.
Having a Scrollview (UITableview) with another scrollview in it (UITextview) is bad. It can confuse the user because he could scroll the "textbox" on smaller devices instead of the "table".
However, you could go with this solution: UITextView change height instead of scroll
Another solution would be to check what happens when the cell with 0 height is shown. Check viewWillLayoutSubviews() and the constrains in IB.
Hope this gets you one step closer to the solution/answer.
I have a collectionView inside a UITableViewCell. The collectionView's content is dynamic, hence, its height is dynamic too and the tableView cell's height depends on the collectionView's height. The collectionView cells have different sizes. The collectionView's height is always set to fit its contentSize height.
My problem is that the tableView's function heigthForRowAtIndexPath, is called before the collectionView is created (in cellForRowAtIndexPath) so, to return the height that fits the collectionView, I need to calculate it manually (which doesn't seem like a good idea for a collectionView with cells of different sizes).
I tried to use autolayout in order to use UITableViewAutomaticDimension but it didn't work (maybe I did it in a wrong way).
What is the best aproach to make a UITableViewCell consider the height of its subview in heightForRowAtIndexPath? Can I know a collectionView's estimated size without creating it?
Use self sizing, which is available in iOS 8. There are plenty of good tutorials online, like this one: http://www.appcoda.com/self-sizing-cells/.
The idea is that you can use auto layout and a few lines of code in viewDidLoad to render a table view cell that dynamically fits the content in it.
Some more tutorials:
http://useyourloaf.com/blog/2014/08/07/self-sizing-table-view-cells.html
https://github.com/smileyborg/TableViewCellWithAutoLayoutiOS8
I use a table view which has got the cells with varied set of information and which can not be contained with in the frame of the tableView. So I do need to have a horizontal scrolling capacity in the table view.
Since horizontal scrolling is not possible with tableview,I planned to use a scrollView with horizontal scroll. I added the tableView on top of the scrollView.
The problem I face is irrespective of the content size property of the scrollview, the scrollview never scrolls beyond the contentOffset value X of 256-320 pixels.
I am planning to achieve the effect as it is in the below screen shot
Try two things,
First Set the TableView height as total numberOfRows :
tableView.frame.size.y = numberOfRows * 44;
now disable the tableView Scrolling
and set he scrollView contentSize as per your need;
scollerView.contentSize = numberOfRowsintableView
Surely it will solve your problem
Set proper ContentSize for ScrollView in ViewDidLoad.
scollerView.contentSize = CGSizeMake(Width,Height);
Calculate the Width as Per Requirement And Height (you are using Tableview So You can take Height same as View Height)
Then it will Surely Scroll.
I implemented the entire functionality using code without using interface builder. It works as expected now. I did not know why it did not work when used with interface builder.