I am developing and application that has a tableview, and I am able to insert new cells dynamically. The problem is that the tableview needs to have categories for something like color or shape, my question is:
When I am adding a new cell how can I choose in wish category the cell will be?
I know that I have to build my database in a certain way but the problem is that im no good with coredata and im a bit confused with the topic, so if someone could give me some explanation or sample code I would be very thankful.
Best Regards.
If you setup your datasource right, then you could retrieve an object with the desired category in it. When you retrieve that object in the cellForRowAtIndexpath: you will then extract that category and use it in some sort of switch statement which allows you to alter the cell with the desired shape and color and all you want.
For cleaner code however I suggest to make a custem cell and call some sort of update-method (in the same cellforrowatindexpath:) which does the same visual stuff for you.
What you do with the database or whatever should be seen apart from this matter since you should fetch that data in some other class. Which then will be shaped into your custom object which will then be put in your datasource.
Without some specifics in your question however this won't be more then theoretical shizzle.
However you should be able to figure this out.
Good luck.
Related
I have seen a lot of different ways of implementing custom cells in a table view.
Like different file owners, get it from bundle and call the the latest obj of the array and a lot more.
But all did not feel right.
What is the best and correct way to create and use custom table view cells (with interface builder).
I think Storyboards are the new proper way. I use this method:
http://iphonedevelopment.blogspot.com/2009/09/table-view-cells-in-interface-builder.html
And it works quite well. I think it's somewhat proper in that you are asking the OS to do most of the work, although it's a little sneaky that the cell is assigned to a property as part of the NIB loading as a side effect.
Had the same problem. For me it is now solved with storyboards in ios5.
I have an NSCrollView that contains an NSTableView. It has 3 columns and 4 rows. I have 4 NSStrings with content that I need to copy into the scrollview.
Using Xcode 4 I tried connecting the table or the NSTextFieldCell and then adding the text via
[_Cell1 setStringValue:MyString];
But nothing happens. It doesn't get updated.
Any way to do this?
Thank you.
EDIT:
I found the following answer to a similar question. I still am confused but after reading Apple's example about bindings I can only say that this does not make any sense, so much code to achieve something so simple. That's the problem with everything being an object and with OOP in general.
Any simple samples out there? I don't even know how to start setting this or connecting the gazillion things you need to connect to start working with this
You should use the NSTableViewDelegate. That's a set of methods the NSTableView calls to get the data that it should display. You just have to declare the delegate object of the tableview.
Delegate Protocol
NSTableView Tutorial
Unfortunately, you can't "add" or "set" the content of a table view. Like most view objects, a table view doesn't store content; it depends on a controller to provide content when it needs it.
There are two options:
Data source: simplest, easiest to understand
Binding to an array controller: harder to understand, but less work to implement
The best Apple resource on the subject: Populating Cell-Based Table Views from the Table View Programming Guide. If you're struggling, I suggest you start with the data source option. It'll be just a few lines of code, and you can adapt the simple samples from that document.
To populate the table, you need to implement these two methods:
– numberOfRowsInTableView:
– tableView:objectValueForTableColumn:row:
And to change the data, you'll need to implement one more:
- tableView:setObjectValue:forTableColumn:row:
You'll need to set your controller as the data source for the table view in interface builder. And the correct protocol for this is NSTableViewDataSource, not NSTableViewDelegate.
You could use an NSArrayController and bind the table columns' value bindings to the array controller's arranged objects. Then add the values you want to display to the array controller.
I have a class that contains several textfields. I need to know when one is done being edited and send the new information to one of my other objects.
This question seemed similar but in Objective C? The buttons should be visible when the user is done entering the value in the textfield
Objective-j doesn't have the same functions.
Browsing the documentation I found several functions that seemed like they might be able to help such as, textDidEndEditing but didn't understand how to use it. There are several more that sound related and I don't know what to use.
Summary: when the textfield is done being edited I need to perform another function. Also there are multiple textfields so I need to know which one is edited.
controlTextDidEndEditing is the delegate method you should implement. Or you can just set the target/action of the textfield
I am trying to retrieve a specific NSCell data from an NSTableView through [NSTableColumn dataCellForRow] but every time it shows different value for same row and same column. The data source remains the same at all time. The NSTableView is bound to an NSArrayController .Please if anyone can suggest a better way to do it correctly. And I don't want to implement those delegate methods. Let me know if you require more information.
Regards
Well, this is not a good idea to get data from a cell. Cells represent View concept in Model-View-Controller paradigm.
You should be able to access all the data that a cell can access, so get it from the primary data source.
Simple question, but I am struggling a little to understand how Interface Builder interacts with the rest of the program developed in X-Code.
My UI has an NSPopupButton that I would like to fill with an array of strings that I provide. I have a controller class that defines the method to execute when the button is clicked. Is that where I would populate the NSPopupButton? It seems like I would need to initialize is somewhere, but I am confused about exactly where to do it. I know I need to use addItemsWithTitles, but where do I call that?
Assuming the list isn't changing over time, awakeFromNib (in the controller) would be a good place to populate the menu. If it's dynamic, then you'd want to populate it when the source of those strings changes.