I am currently playing around with a navigational based app. Where I want to allow the user to construct a search query by selecting one of several different uitableview cells when touched leads them to a sub uitableview where I will display the data for the user to select.
each cell will load the same subview however it will load it with different datasets. I am wanting to know an appropriate way of handling the transition of data (when the user selects the cell from the subveiw how can I control which cell that data should be sent back to?
I am thinking about passing the subview the Indexpath of the mainviews selected cell.. then passing it back to when the subview is poped from the stack so that it knows where the data needs to be.. is that the best solution? or is their another way of doing this?
Yes, give the subview a property for the indexPath of main view's selected cell. Set this property in the main view's didSelectCell method before pushing the subview.
Once you pass that indexPath back to the main view with you data, you can use
[self cellForRowAtIndexPath:indexPath]
to access the correct cell.
Related
I want to create UItableViewCell ui programmatically based on API response.
I'm using a API that output a set of articles, but the content of these articles could be deferent, for example some articles may not have a description, or some of them may not have a image. I want to create Tableview cells programmatically based on these data.
I have tried setting constraints in viewDidLoad method of the cell but It does not work.
Do you have any suggestions on how to do this?
Depending on how different the articles are from each other, you could either choose to design multiple different kinds of cells for your table view and choose which cell to use for a given row based on the data you have, or you could design a single cell that uses a stack view to hide the labels that you don't have data for. When you set a view inside a stack view to isHidden = true then the stack view will resize its subviews as if the hidden view does not exist.
I am building an app that requires a tableview control so that users can select multiple rows and act upon them in some way. I find it easy to load my data and display it using the UITableViewController but it seems when I do it this way I am unable to place any other controls on the page, such as a toolbar to give the user some actions to perform on the selected rows. I can place a toolbar control on the form in the storyboard, but it doesn't render in the emulator.
Using a UIViewController and placing a TableView on it seems to come with its own set of confusing challenges (that will make total sense once I conquer them).
Is there any advice for a smooth way of getting a table view with toolbar controls? Thanks!
don't use a TableViewController. Use a Standard ViewController, then add a UITableView to it, and adjust the size. This way you will be able to do whatever else you want on that view without limiting yourself to the tableView only functionality.
When you do this make sure you add the datasource and delegate to the connected table. Then add cellForRowAtIndex, number of sections, number of rows, and whatever other delegate methods you need for your table.
Good luck
Is there any advice for a smooth way of getting a table view with toolbar controls?
Yes there are few ways to accomplish this, one way would be adding a footerview to your tableviewcontroller check these
http://developer.apple.com/
UIButtons on tableFooterView not responding to events
Easier way to add this is using storyboard.
Just drag and drop a view in to your tableviewcontroller, then you can adjust the views size and put anything from objects menu to inside of the view.
Now the problem with that is view will not be stable position at the bottom of the page like a tabbar. Lets say you have only 1 row in your tableview, footer view will go up just below that 1 row, lets say you have hundreds of items in your tableview toolbar will be at the bottom of the rows.
The other solutions for your problem would be either create a custom view and adding it to current view or window (this is little bit adbance),but if you want this just google it.
Or just as you said, create a viewcontroller and put a uitableview inside. Dont forget to add <UITableViewDelegate,UITableViewDataSource> to your .h file and then you can call UItableview delegate methods.\
Good Luck.
I have a button inside each cell. When it's pressed, the image is changed (basically a checkbox) to denote a selection. When you scroll to the bottom ... then scroll back up to the top. The image is reverted to the original image.
This question is pretty similar to this:
Preserve Cell Image After Scrolling UITableView
And others. But, I can't seem to find a good answer. I understand that's it's reverting back to how the uitableview is setup when the cell goes off the screen. But, how do I save the changed image to the uitableview so when it scrolls it doesn't revert to the original?
Thanks in advance! =)
It's changing back because cells are reused. When your cell is going off the screen it is taken out of the view and put back into the reuse pool. Then you're getting it out of the queue again in cellForRowAtIndexPath and setting it back up as the default.
The question you linked to is exactly what you should follow. You should store the state of your cell in your view controller and then when you set it up again in cellForRowAtIndexPath you should load that state and set up the cell appropriately.
One simple way for your method would be to have an NSArray which you set up to be the same size as the number of rows in your table and then in that just store an NSNumber for each row which contains a boolean value on or off for your selection state. When the user toggles, toggle the value in the array and then in cellForRowAtIndexPath read that value and set it up appropriately.
I'm assuming the checkbox in your table view cell is changing state to a selected state because a user selected it. You shouldn't use UI elements to maintain the state of your app. That is, when the user taps the checkbox, you should use that event to somehow reflect that state change in a data object in your app. Then, when that cell needs to be displayed again, you configure it with the state you previously saved. This allows for things like cell reuse, and view unloading and is all-around a good habit.
Guys, I didn't find a clean and a simple solution for the following issue. I've a UITableViewController view which uses a UITextFieldCustomCell that I implemented.
The table has several rows, that requires the user to scroll down an enter values on each cell, which contains a UILabel and a UITextField.
Every time the user change the value on the UITextField the UIViewController gets notified and stores the value in a NSDictionary using the cell indexPath.row property, in order to identify what's the key for the cell where the value needs to be stored.
The problem is if the user keep focus on a cell and then scrolls up or down (removing the cell from the view) makes me unable to get the indexPath for the cell, since it's not visible.
So, I cannot store the value since I don't know from which cell the value is coming.
Have anyone run through this issue before?. It seems to be a common design between iPhone applications, does anyone have an idea if is this a good implementation or not?
Thanks!
I assume you're observing textFieldDidEndEditing:. Are you saying it's not firing, or that it is firing, but it's no longer in any of the cells (possibly because it's in the process of being removed)?
Assuming the latter, my approach would be to use setTag: on the UITextField to make it easy to keep track of its index. This would save you from ever hunting around in your cells, even in the case that they are on the screen.
I need some help.
I've got a segmented control. if segment 0 is clicked it shows a UIView, containing a uitableview.
If segment 2 is clicked it shows another UIView which contains a uitableview as well.
These two tableviews got the same datasource. But i want the second tableview to have an other datasource. SO i thougth of loading another nib into the second uiview containing a the tableview which gets its data from the corresponding .m file.
I don't know wheather this is the best solution. If you've got any other ideas let me know :)
thanks in advance!
I think the best way to do this is to have just one table view. In the cellForRow method have a conditional which queries the state of the segmented control. Depending on the result of that if statement, return the type of cell you want. In addition, in your segmented control callback you'll have to do a [tableView reloadData]
Do you know that you can have the same tableview display different data sets? You don' have to use an entirely different NIB just to change UITableViews so you can display different data. Or am I understanding your question incorrectly?