I have a ViewController and another one which is a TableViewController. So I have the tableview in a container view in the ViewController. Moreover I have a button which will save the values from the tableview. But how do I access these values? I've uploaded a screenshot so you can imagine it better :)
I don't understand why you use a container in this case.
But, have a look in
self.childViewControllers
It should contain your tableViewController.
You make an IBOutlet. Go to the storyboard and drag your embedded tableView into your other view controller. There you can reference all of its exposed stuff (in the .h), assuming its been loaded already.
Reference on outlets: https://developer.apple.com/library/ios/documentation/General/Conceptual/CocoaEncyclopedia/Outlets/Outlets.html
Good post on using container views:
IBOutlet link to embedded view controller
Related
I'm learning swift and I have gone through tutorials where some developers delete the View Controller entirely and just drag in a TableViewController and start using that. While other developers in tutorials create a TableView from within the View Controller.
Is it better to delete the View Controller and add a Table View Controller or just work with a TableView within the View Controller?
It is all about the requirement. Both are correct way. Don't be confuse.
When you using TableViewController then it only behaves with the UITableview. i mean controller totally dedicated itself as tableview.
When you using TableView inside UIViewController then you can create whole UI deign in your own way.
Note: As you'r new so I suggest you to go with TableView Inside UIViewController because you can achieve any type of UI with this even you can create ditto functionality(UITableViewController) with this but vice versa not true.
For eg.
tableView inside UIviewController
You can do it in either way. If your viewcontroller is going to have a tableview alone, then u can use a UITableViewController or else use UIViewController and set the delegates and datasource
I have a UIViewController with a UITableView that is fed with data from the local database. When the user first launches the app (after installing) the table view is empty and I display a UIView in the middle of the table view that contains a UIImage, a UILabel and a UIButton (a call to action).
The first version of this view I built programmatically, which was no good to me because every time I tweaked something I had to build the app again. Then I switched to the storyboard but had to drag a UIView to the middle of my tableView. It is working now but I don't like the way it is, I can't edit my table view cells without having to move the UIView out of the table view.
I'd like to have a way to build this view entirely separated from my tableView (or even from my view controller in question) and then reference it in the viewDidLoad call of my view controller.
Unfortunately Xcode does not allow us to drag views directly to the storyboard so I'm pretty lost here.
Please tell me if I haven't been clear enough. I appreciate any help you could give me.
UPDATE: It'd be particularly awesome to me if I could also create a custom Swift class for this view of mine and reference it in the storyboard. And then in my viewDidLoad I could simply instantiate my custom view.
Thanks in advance.
Create a XIB file in which you can drag a view (without a view controller).
In your code you can load the XIB using NSBundle.mainBundle().loadNibNamed("MyXibName", owner:self, options:nil).
In the XIB file you can give the UIView a custom class (like you can do with view controllers in storyboard).
You then of course have to retrieve the view from the array returned by loadNibNamed and cast it to your custom class.
I'm attempting to create an application for iOS, using Xamarin and storyboards. Within this, there shall be a button located in a TableViewController which will navigate the user.
To do this, I've used a Container, embedded to a TableViewController. However, my concern is I wish to add an Outlet from the button within the TableViewController to the ViewController header class - Yet it only allows me to try and add one to the 'UITableViewController.h' file.
What is causing this and how am I able to add the Outlet to the 'ViewController.h' file? (Extremely sorry if this makes little sense)
You should not use both the UITableViewController and the UIViewController. UITableViewController is a subclass of UITableViewController so all you need the UITableViewController and you should drag the outlet to it.
I have created a view and now I want to load that view from another viewcontroller without allocating the view. Is it possible or not. please clarify me.
I am doing like following
1)Added UIView in viewcontroller.xib and given view class name for the view.
2)created IBOutlet for the view and connected.
Now I want to access one property of a view without allocating. Is it possible to do or not.
If you've created an IBOutlet and hooked up the view, then you are done. The view is allocated when the xib loads and the reference is placed in the IBOutlet. You can access the view and it's properties through that without doing any allocating yourself.
When your view controller is loaded, your view connected to it (by IBOutlet) also gets loaded. In this case you have access to all view's property.
Look at "Looading up an XIB" section in this article.
I have a Container View that holds 1 of 3 view controllers swapped out by 3 tabs (across the bottom).
Here's my Storyboard:
I'm taking this approach so that I can have custom tabs and a single Save button for all the fields in this big form.
How can I access the IBOutlets in those 3 child view controllers from inside my Entry Detail View Controller class?
Here's what I've done to try and access it in the parent.
//EntryFlightInfoViewController.h (Child 1)
#property (strong, nonatomic) IBOutlet UITextField *aircraftIdTextField;
Then in my parent class (Entry Detail View Controller) I can't access the property:
//EntryDetailViewController.m (Parent)
#import "PPEntryFlightInfoViewController.h"
- (IBAction)buttonSave:(id)sender {
NSLog(#"save: %#", _aircraftIdTextField); //(!) Error: Use of undeclared identifier '_aircraftIdTextField'
}
How do I access another view controller's IBOutlets when they are in a Container View? Hopefully I'm on the right track. Forgive me as I'm still quite new to Objective-C. :)
View controllers in a container view are children of the controller with the container view. So, you can access the current child view controller with self.childViewControllers[0], and the outlet with [self.childViewControllers[0] aircraftIdTextField]
The short answer is you can't unless you write your own communication layer. You can get at the different views via the childViewControllers (mentioned above) as well as getting your own custom pointers in your prepareForSegue method call as the view is loaded into the container view. (see this link for more info on this) This will work great if you are forcing the user to visit each page. If not then the same defaults you'd load there on the first viewDidLoad can likely be saved without checking the specific view controller.
Apple's answer is to never have a save button. If you edit it, you meant it, and it's saved immediately. =)
That said, were I you, I'd have an object that all of the views access to load/unload their data for storage whenever you show/hide the different views, possibly in viewDidLoad/viewDidDisappear. This way you always have a "known good" object ready for saving, and you won't have to directly access those view controllers.
Hope that helps some.
Clifton, whenever you can, you should avoid having VCs know about each others' controls. You could just have the save button send out a message, and have the three subordinate VCs observe for it. When they get the message, they save their info. That way, the master VC doesn't have to know about controls inside its subordinates.
You need a reference to the current tab view controller, then you ask it for the outlet:
self.entryFlightInfoViewController.aircraftIdTextField
By trying to use _aircraftIdTextField your trying to directly access an instance variable on the container view controller class. Obviously if doesn't have a variable with that name so you get the compile error.