How can I manage the height of the TableViewHeader based on the lines of an UILabel?
I followed this guide but I can't manage the header height dynamically.
In the guide it is fixed to a fixed size to which I tried to add the height of the label but it doesn't work.
I would prefer to use a tableview and not a scrollview as the data is populated dynamically.
I also tried to modify the constraints of the label dynamically, but when scroll the view of the label is stretched and not the image.
Add this in viewDidLoad:
self.tableView.sectionHeaderHeight = UITableViewAutomaticDimension;
self.tableView.estimatedSectionHeaderHeight = 25;
After that just give correct constrains for the headerView . That's it! No need to implement heightForHeaderInSection
Related
I am using table view for my chat application, in which the chat responses are added either one of two textviews as shown in the image. The thing is whenever I add a large text, the cell height does not expand to show the full text. It only shows the last line of that text. I am using objective-c. Is there a way to solve this ?. I do not want to completely create a new view like the questions asked before, I want changes to this specific view.
First, you need to use Label and set top and bottom constraint between label and contentView cell.
In order to allow the self-sizing cell mechanism to work, you must set the rowHeight property on the table view to the constant UITableViewAutomaticDimension. Then, you simply need to enable row height estimation by setting the table view's estimatedRowHeight property to a nonzero value, for example:
_tableView.estimatedRowHeight = 44.0; // set to whatever your "average" cell height is
_tableView.rowHeight = UITableViewAutomaticDimension;
You need to defined self-sizing cell like this.
tableCountries.estimatedRowHeight = 100.0;
tableCountries.rowHeight = UITableViewAutomaticDimension;
Make sure you have a proper constraint. You can have a constraint like this.
In the below label you need to set your textView top position. That's why when the below label expands it automatically expand label and text view will push to bottom.
I think your cell is not gettings its height because of textview scrolling maybe that will help:-
Use UITableViewAutomaticDimension and for that your tableview cell content should justify both top-bottom leading and trailing constraints to calculate cell height.
Set scrollEnabled to "false" for your textview.
With everything on the place your cell will get its height for sure.
you can do it in many ways :
1) You can set dynamic height of cell using UITableViewAutomaticDimension.
You need to set proper constraints in storyboard like setting top and bottom.
in ViewDidLoad add below :
tblView.rowHeight = UITableViewAutomaticDimension
tblView.estimatedRowHeight = 100
and in tableView cell's height method :
return UITableViewAutomaticDimension
2) Find text's height dynamically using below function :
let width = 100.0 \\your text label's width you gave
var height = chatMsg.text?.height(withConstrainedWidth: width, font: chatMsg.font!)
using above code you can find the height of your text. and you can use it dynamically
3) there are many code available to use for chat application in which you just need to pass text/image, and it will handle everything else.
Link : https://github.com/kerry/iMessageBubble
Add these two delegate methods:
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewAutomaticDimension;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewAutomaticDimension;
}
Create Custom UITableViewCell with Three UILabel like lbl1,lbl2,lbl3.
Add the AutoLayout Constraints to lbl1 left, right, top and bottom. With fixed height (30).
Then set same constraints to remaining two Labels.
Here is main things:
1.select lbl1 heigh and double click on height constraint and set >=30
Do same things with lbl2 and lbl3.
Final step is:
Select lbl2 top constraints, change the constraints property like <=8.
Do same things with lbl3, that's it we are done all.
thanks..
I have tableview inside tableview cell , I am using UITableViewAutomaticDimension in heightForRowAt, tableview height is not adjusting automatically. I have to calculate cell height manually.
Any idea ?
You are missing either bottom or top constraint.
Consider you have to add label in table cell, then you have give both top and bottom constraint to label (make line number 0).
It will automatically increase the size of table cell according to label text.
Don't forgot to set estimatedRowHeight.
To get automatic cell height work correctly you must hook all your constraints properly from top to bottom in the cell Xib , or if you're creating constraints in code , that's how auto-layout can calculate the height automatically
self.tableView.estimatedRowHeight = 50.0
self.tableView.rowHeight = UITableViewAutomaticDimension
Set all constraint like bottom, top, left, right.
I have a tableviewcell with two labels and the label's height will change depending on the content so tableviewcell height will automatically change.
now how can I make tableview cell height to autogrow ?
Please clarify me if the tableview cell height will autogrow if the label height changes ?
To make it tableview cell autogrow you have to keep in mind of the following two things in mind,
Right constraint(top, bottom, right & left) for the UI elements inside the tableview cell.
Usage of UITableViewAutomaticDimension & estimatedRowHeight property as follows,
tableView.estimatedRowHeight = 100 // A rough estimated height for your cell.
tableView.rowHeight = UITableViewAutomaticDimension
Refer the following tutorial for better indepth explanation on how to implement it.
http://matteomanferdini.com/the-correct-way-to-display-lists-in-ios-and-what-many-developers-do-wrong/#autolayout
https://www.youtube.com/watch?v=e1KJQs0frbM
A lot of the solutions I've seen here include changing the cell's background to an image and using sections for rows rather than just rows themselves. I'm looking to have only two sections and have each cell expand in height on tap, so neither of those solutions would work.
I saw one solution includes setting the frame of the cell in the layoutSubviews() function like so:
override func layoutSubviews() {
super.layoutSubviews()
self.frame = CGRectOffset(self.frame, 0, 10);
}
When I do this however, it only gives margin to one cell and that's only when I tap on the cell.
Is there a surefire way to add spacing in between UITableViewCells without being hacky and breaking the cell layouts in the process?
I did this yesterday pretty easily with auto layout.
I set the background of the cell and it's content view to clear, then I created a new view and setup constraints all around it and put my labels inside of it. The height changes dynamically based on the label so I needed to use UITableViewAutomaticDimension for the row height and give it an estimated row height as well.
I don't see why this wouldn't work for expanding it on a tap as well, you just might have to reload the cell.
make the cell and it's contentView transparent
contentView addSubview customContentView and layout your cell on customContentView
customContentView pin to contentView top leading trailing with offset 0 but pin to bottom with offset 10 //the margin height
I'm trying to setup a tableview which each cell will have an Image on the left, a Label which overlays the image, and finally a label to the right of the image with long text in which I would like for it wrap to the next line if needed. My tableview row height is set at 65.
I have set the number of lines to 0 and set the line break to work wrap.
I even tried setting parameter programmatically in my CustomTableViewCell class:
self.materialLabel?.numberOfLines = 0
self.materialLabel.sizeToFit()
self.materialLabel?.lineBreakMode = NSLineBreakMode.ByWordWrapping
I've tried many combinations of setting constraints on my label, but it either doesn't work or affects all objects in the cell with the image and image label out of sync. The alignment constraints are not available to set.
Working with Xcode 6.3.2, Swift 1.2, and iOS 8
Thanks in Advanced!
You can use dynamic cell height ( or self sizing cell).
Basically, you create top, leading, bottom, trailing label's constraints relative to cell's contentView.
and then set
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = someValue
http://www.raywenderlich.com/87975/dynamic-table-view-cell-height-ios-8-swift
There are many ways to setup dynamic height for table cell.
If your not not using autolayout, you need to calculate table size programmatically and return using table view delegate method.
If your using autolayout, your life will be very easy. Add constraints to cell, I.e add border, width and height constraints to image. Add only 4 border constraints to image(don't add height constraint). This may not be the exact constraints, but this will give you a idea. Add following code in viewDidload
tableView.rowHeight = UITableViewAutomaticDimension
tableView.estimatedRowHeight = someValue
This should work.
Turns out my label width was too wide. I had to anchor my imageview and the imagelabel and set the width and height before setting the constraints on my label.