I'm trying to put the Flowlayout into TableViewCell content.
Everything works fine, but I want to setup dynamic row height based on FlowLayout height.
Using the next method we can get need size. But when I setting it to value that is not equal "44" - FlowLayout stops to show its content. It works only with 44 px.
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 44.0;
}
;
Changing row height via storyboard produces the same result. So Is it possible to contorl the size of nested FlowLayout?
There is an article on cimgf.com Please see: http://www.cimgf.com/2009/09/23/uitableviewcell-dynamic-height/
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I have UITableView that contains 4 different types of customized cells in storyboard. Each cell has customized UILabels which get variable amount of text data from backend. I am struggling with making the cells resizing correctly. I would really want to change the height of each cell but I can not use heightForRowAtIndexPath because it is called before cellForRowAtIndexPath, but the height is actually calculated within each customized cell.
I tried writing in each cells' height into an array while the UITableView is loading, then just reloading it all over again once, but no effect. I tried using CGFloat rowHeight = UITableViewAutomaticDimension with no success either. The customized labels in each cell definitely grow with text which I see when I just statically change row height to higher numbers. So, I would need somehow my labels to push on rows to make them grow, not sure.
Different similar posts on stackoverflow that I found did not help.
The issue was that I needed to set up top and bottom constraints to the ContentView and NOT to the cell itself in the storyboard.
Label -> ContentView top and bottom constraints need to be set up. And then UITableViewAutomaticDimension specified in viewDidLoad:
self.tableView.rowHeight = UITableViewAutomaticDimension;
estimatedRowHeight should be set too. For example:
self.tableView.estimatedRowHeight = 76.0f;
First Method called is:
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
Second:
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
Then:
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
set a break point in the above methods and test it. So if you want to preset the height use estimatedHeightForRowAtIndexPathmethod.
Is it possible to use this feature without using text related views? This would be to not have to calculate the height, but instead let the cell self-size using subviews with constant height constraints, and eventually changing those height constraints at runtime.
The proper way to handle dynamic cell height changes in a table view is through tableView:heightForRowAtIndexPath: in UITableViewDelegate. You can grab the height from the subviews but you have to link that value to the index path of the cell.
Yes,you could build a tableviewcell with dynamic height.
1.use constraints to configure your tableviewcell's subviews
2.add a line of code In viewdidload method:
self.tableView.rowHeight = UITableViewAutomaticDimension
3.in some cases you must add another line of code In viewdidload method:
self.tableView.estimatedRowHeight = 40 //or any value other than your tableviewcell's height in IB.
Yes you can do that.
First Add constraints to subviews and add the following code in .m file.
(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewAutomaticDimension;
}
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{
return UITableViewAutomaticDimension;
}
I have a tableview UITableViewAutomaticDimension for auto layout, and I get the tableview content size to make the tableview height as it content height after tableview cell configure and reload, this height isn't right it seems calculate by estimatedRowHeight. I know I can get the last right height use kvo to observe the tableview content size, but I don't know which is the last right one, because I just want do something once when content size is right. How can I do that?
you need to add a delegate method like
-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath
{return UITableViewAutomaticDimension;
}
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(nonnull NSIndexPath *)indexPath
{
return UITableViewAutomaticDimension;
}
before that you should pin 4 sides on that contents which you dropped in prototype cell.
now you got the exact row heights of each cells.
I'm using Apple's DateCell sample Xcode project to figure out how to use a UIPickerView inside of a UITableViewCell, but I'm having some trouble figuring out the constraints that the sample code has set up for the UIDatePicker in the storyboard.
Link: https://developer.apple.com/library/ios/samplecode/DateCell/Introduction/Intro.html
It says that the UIDatePicker has a constraint relative to the actual UITableViewCell, but when I try to set up a constraint between the two, I can't. Ctrl-dragging from the picker to the cell doesn't highlight the cell. I tried doing it with the cell's content view rather than the cell itself, but that doesn't quite produce the same result as in the sample code's storyboard.
These are the constraints set up by the project for the date picker:
And for the cell:
What the sample's storyboard looks like:
How can I reproduce the above image using constraints?
Any help would be greatly appreciated.
I found that the sample's static height was not what I wanted to use anyway, since I have some cells with lots of text that need to have variable heights for each cell. So instead of the approach in the sample which grabs the height of the picker cell from the pre-defined storyboard size, I used UITableViewAutomaticDimension to automatically fit all of my cells for height. If you don't want auto height, it's still pretty easy to adapt the following solution to set the height to a static value, as I mention in step 3.
Set tableview row height to auto when the view loads:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
self.tableView.estimatedRowHeight = 60.0; // Set your average height here.
self.tableView.rowHeight = UITableViewAutomaticDimension;
}
Add an estimated height so that it works properly (at least in iOS 8). If you don't add this, you might get some buggy behavior when it draws the cell heights.
- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewAutomaticDimension;
}
For auto height, remember to remove the tableView:heightForRowAtIndexPath: definition if you have one, as it could interfere with the auto settings.
// Don't define this at all if you want the picker cell to have auto height.
//- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
//{ }
If you want to use a static height for the picker cell, then define the tableView:heightForRowAtIndexPath: function and just return the static value here instead of using the auto dimension like the sample does it. Example would be something like this:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
// This would return the static height for the picker, but auto heights for the rest of the cells.
return ([self indexPathHasPicker:indexPath] ? self.pickerCellRowHeight : UITableViewCellAutoDimension);
}
And then you'd modify the sample to set your static height instead of grabbing it from the frame value in viewDidLoad.
// obtain the picker view cell's height, works because the cell was pre-defined in our storyboard
//UITableViewCell *pickerViewCellToCheck = [self.tableView dequeueReusableCellWithIdentifier:kDatePickerID];
self.pickerCellRowHeight = 216;//CGRectGetHeight(pickerViewCellToCheck.frame);
Rather than trying to recreate the same constraints from the sample, I told storyboard to Reset to Suggested Constraints for the UIPickerView, and then added one more. It added the first two in the picture, and then I just added one more for aligning the center X. My view happened to have the shown numbers from the auto settings but yours may be different.
In case you haven't already done it, part of making the picker work is to make sure the dataSource and delegate for the UIPickerView are set to the view controller using storyboard and control clicking and dragging.
I have a tableview that fill with custom cells,, Now I want to increase the width of the cell,I increased the cell height of UITableview. But the problem is still same. Any one know how to increase the height of custom cell in UITableView.
Thanks,
If your cell heights vary, implement the following delegate:
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 44.0; // edit this return value to your liking
}
If they don't, merely set the rowHeight property of your table view instance to whatever height you want all of your cells to be. This answer does a good job of explaining why.