When you create a dialog similar to the one below
And then navigate to a new view controller by tapping on a radiobutton group (in my example industry type), then return back your labels are endinf up overlapping the text. Tested on simulator and Apple iPad mini 2.
Has anyone found a way to fix this without creating a custom class ?
The only way was to create a new class and explicitly specify constraints by overriding GetCell method:
public class BaseEntryElement:EntryElement
{
.....
public override UITableViewCell GetCell (UITableView tv)
{
var c= base.GetCell (tv);
c.ContentView.SubviewsDoNotTranslateAutoresizingMaskIntoConstraints ();
c.ContentView.AddConstraints (
c.ContentView.Subviews[0].WithSameCenterY(c.ContentView),
c.ContentView.Subviews[0].AtLeftOf(c.ContentView,BaseEntryElement.offset),
c.ContentView.Subviews[0].AtTopOf(c.ContentView),
c.ContentView.Subviews[1].ToRightOf(c.ContentView.Subviews[0],40),
c.ContentView.Subviews[1].WithSameCenterY(c.ContentView.Subviews[0])
);
return c;
}
}
Related
I have a storyboard set up like so:
As you can see, I have a home screen. It has access to a navigation controller. It has two ContainerViews, one used as a sidepane, the other as the main content. I plan to swap things into this main content container as I need them.
One of the things I would like to show in this container, when it is selected from the sidepane, is a CollectionView of cells that show people. Each cell has a photo and the person's details.
The best code example I could find for CollectionView was the Xamarin StateRestoration sample project. It includes a storyboard. I have followed the recipe as best I can while working around my own specific storyboard.
The problem now is that the GetCell(UICollectionView collectionView, NSIndexPath indexPath) method used to populate each cell in the CollectionView is not being called. As far as I know I'm supposed to instantiate the CollectionViewController's Datasource property. I've tried this in AppDelegate and in the ViewDidLoad of my CollectionViewController itself, and GetCell is still not getting called. Why is this?
Any help is appreciated! Ask me to edit if you need more information.
You need to set both datasource and the delegate. As you've mentioned you've set the datasource. To set the delegate open up the storyboard in xcode, select UICollectionView and control drag to the its parent view controller. Have a look at this gif.
Also make sure you implement IUICollectionViewSource interface in your target view controller
public partial class DetailViewController : UIViewController, IUICollectionViewSource
{
protected DetailViewController(IntPtr handle) : base(handle)
{
// Note: this .ctor should not contain any initialization logic.
}
public nint GetItemsCount(UICollectionView collectionView, nint section)
{
return 10;
}
public UICollectionViewCell GetCell(UICollectionView collectionView, NSIndexPath indexPath)
{
var cell = collectionView.DequeueReusableCell("PersonCell", indexPath) as UICollectionViewCell;
return cell;
}
}
EDIT 1:
You can also do this programmatically. Enter the storyboard, in Widget properties set the name for the UICollectionView - PersonCollection. Then in code behind view controller override ViewDidLoad and set WeakDelegate and WeakDataSource (weak because we definitely not want to create cyclic reference and memory leaks for iOS)
public override void ViewDidLoad()
{
base.ViewDidLoad();
PersonCollection.WeakDataSource = this;
PersonCollection.WeakDelegate = this;
}
Hope this helps!
I have an app with a medium-sized storyboard, which is complicated enough for me not to want to mess around with it too much.
I want to copy this storyboard and change the color scheme and let the user select which color scheme to use.
My question is: can I programmatically select which storyboard will be used by default on startup? If yes - how do I do that?
I looked at a somewhat related question: Storyboards Orientation Support in Xcode 4.5 and iOS 6.x ?
Based on that code I made an extension method:
static bool IsStoryboardLoading {get;set;}
public static T ConsiderSwitchingStoryboard<T> (this UIViewController from) where T: UIViewController
{
if (!IsStoryboardLoading && LocalStorage.Instance.IsWhiteScheme && false) {
try {
IsStoryboardLoading = true;
UIStoryboard storyboard = UIStoryboard.FromName ("MainStoryboard_WHITE", NSBundle.MainBundle);
T whiteView = storyboard.InstantiateViewController (typeof(T).Name) as T;
from.PresentViewController (whiteView, false, null);
return whiteView;
} finally {
IsStoryboardLoading = false;
}
}
return null;
}
}
and then I use it in ViewDidAppear override:
public override void ViewDidAppear (bool animated)
{
this.ConsiderSwitchingStoryboard<MyViewController> ();
}
This code works in some cases but in others it causes an error when performing a push segue:
NSGenericException Reason: Could not find a navigation controller for segue 'segSearchResults'. Push segues can only be used when the source controller is managed by an instance of UINavigationController.
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSendSuper_IntPtr_IntPtr (intptr,intptr,intptr,intptr)
It might be simpler to just use 1 Storyboard and have 2 sets of controllers in the same storyboard. Just use different storyboard ids for the controllers. You can use the same class on those if needed.
For example:
var whiteController = Storyboard.InstantiateViewController("MyWhiteController") as MyController;
var blueController = Storyboard.InstantiateViewController("MyBlueController") as MyController;
Both could create an instance of MyController, but pull out different layouts from the same storyboard file.
Another option is to use UIAppearance to dynamically set a "style" on all controls of a certain type in your app.
For example, to set the default UIBarButtonItem image throughout your app:
UIBarButtonItem.Appearance.SetBackgroundImage(UIImage.FromFile("yourpng.png"), UIControlState.Normal, UIBarMetrics.Detault);
(You might check my parameters there)
I am new to Monotouch and attempting to understand how some of the basics hang together. Hopefully someone out there will be able to assist.
I've created a test project in MonoDevelop based on the Multi-Screened Apps tutorial on the Xamarin site and have extended it to include a tableView. I am having issues with referencing the Navigation Controller in a view that I need to push a detail view onto to display the detail of an item tapped in the table via an accessory button. I know some of the coding is scrappy, just been trying to get it working at this stage rather than the clarity in the code! (I'm using the latest versions of all Mono tools/libraries etc and XCode 4 on Lion). Starting at the beginning here's the code in FinishedLaunching in AppDelegate.
window = new UIWindow (UIScreen.MainScreen.Bounds);
this.rootNavigationController = new UINavigationController();
// Create a new homescreen
HomeScreen homeScreen = new HomeScreen();
// Add the homescreen to the root navigation controller
this.rootNavigationController.PushViewController(homeScreen, false);
// Set the root view controller on the window - the navigation controller
// will handle the rest.
this.window.RootViewController = this.rootNavigationController;
// make the window visible
this.window.MakeKeyAndVisible ();
homeScreen just contains a button which loads a new view containing a table view (OrderList). Here's the button event handler.
void HandleOrdersButtonhandleTouchUpInside (object sender, EventArgs e)
{
if (orderListScreen == null)
orderListScreen = new OrderList();
NavigationController.PushViewController(orderListScreen, true);
}
This all works fine. I've got some dummy data that loads into the table view, which also works fine. OrderData is a simple class for testing which just contains a couple of properties. I've added an AccessoryButton to the cells and am trying to load a detail view when this is tapped. Here's the code that does this - comment in code where issue is! (I'd previously tested the AccessoryButtonTapped functionilty was working by just displaying an alert).
public override void AccessoryButtonTapped (UITableView tableView, NSIndexPath indexPath)
{
var dataSource = (OrdersTableViewDataSource)tableView.DataSource;
if (detailScreen == null)
detailScreen = new OrderDetailScreen();
OrderData theOrder = dataSource.OrdersData[indexPath.Row];
detailScreen.currentOrder = theOrder;
// Cant get a reference to NavigationController here to push the detail view!
// this.NavigationController is not available
this.NavigationController.PushViewController(detailScreen, true);
}
My understanding of NavigationControllers from what I've read so far is that this reference should be available through all views that originate from the root ViewController/NavigationController without the need to pass the reference from AppDelegate through the various view constructors?
Can anyone tell me what I might be missing here?
Thanks in advance.
** An update after reviewing Jason's comment: (Please let me know if this is the incorrect way to post updates)
So, I tried the following:
I saved a reference to the NavigationController in the constructor for the ViewController that contains the table view as follows:
public partial class OrderList : UIViewController
{
UINavigationController navController;
public OrderList () : base ("OrderList", null)
{
this.Title = "Orders";
navController = this.NavigationController;
}
Then passed that into the TableViewDelegate, where the AccessoryButtonTapped is handled, in the ViewDidLoad method.
public override void ViewDidLoad ()
{
orderTableView.DataSource = new OrdersTableViewDataSource();
orderTableView.Delegate = new OrdersTableViewDelegate(navController);
base.ViewDidLoad ();
}
Then referenced that in the TableViewDelegate:
public class OrdersTableViewDelegate : UITableViewDelegate
{
UINavigationController navController;
public OrdersTableViewDelegate(UINavigationController controller)
{
navController = controller;
}
// Rest of class definition
}
Then the reference to the NavigationController using navController compiles with the code as previously described using the following in the AccessoryButtonTapped method:
navController.PushViewController(detailScreen, true);
When I run this and tap on the AccessoryButton I get a null reference exception on navController. The reference to this.NavigationController in the ViewController constructor is null. Am I doing something in the wrong place or sequence?
Cheers
The NavigationController property is on your table's view controller. If you are trying to reference it from your table's datasource, you need to pass a reference to the controller when you create the datasource.
I have a Custom element class that only resizes the rows when I rotate the device. On initial display the rows are not resized.
public class MultiImageElement : Element, IElementSizing
Which implements the IElementSizing interface:
#region IElementSizing implementation
public float GetHeight (UITableView tableView, NSIndexPath indexPath)
{
return 78;
}
#endregion
However, this is never called and the row heights remain the default size.
I add elements to my root in a loop:
for (int i = 0; i < secFolder.Rows; i++)
{
sec.Add (new MultiImageElement (secFolder.ThumbnailPathsForRow (i), imageSize));
}
this.Root.Add (sec);
I found the solution.
To have Monotouch.Dialog implement the IElementSizing, the Sections and Elements must be added to a local "myRoot" variable.
After it's been built out, then set the Dialog's Root to that.
var myRoot = new Root();
MakeElements()
this.Root = myRoot;
This works.
Another solution is custom DialogViewController and then setup Root.UevenRows to true:
public class CustomViewController : DialogViewController
{
public CustomViewController (RootElement root) : base(root)
{
Root.UnevenRows = true;
...
}
...
}
Might not be related, but happened to me that the initial rotate device event was not fired to me. So I implemented the flag and initiated a scheduled selector to be called upon app start to ensure the ShouldAutorotate... was called and performed the Layout for me if needed.
I have a UIViewController with a UITableView. The first row of the UITableView is a cell that has a UITextField in it. I'd like to improve my UI a little by showing the keyboard when the view is shown. I have tried putting the BecomeFirstResponder method in various events but have yet to get this to work.
Can someone please provide tips on how to present the keyboard when the view is presented via the PushViewController?
Thank you.
In your subclass of UITableViewSource or UITableViewDelegate try overriding WillDisplay method, like this:
public override void WillDisplay (UITableView tableView, UITableViewCell cell, NSIndexPath indexPath)
{
if(indexPath.Row == theRowIndexOfTheCellWithYourTextField){
yourTextField.BecomeFirstResponder();
}
}
It should work (note that you probably wish to add some code to make sure this is executed only once)
First of all, always use a UITableViewController derived class instead of a UIViewController when working with a UITableView. This will help you to resize the view, and makes sure fields are visible when the keyboard is shown.
You can show the keyboard for the first field by calling BecomeFirstResponder in the ViewDidAppear event. Example:
public class YourTableViewController : UITableViewController
{
private UITableView _yourTableView;
YourUITableViewSourceDerivedClass _yourSource;
public override void ViewDidLoad()
{
_yourTableView = new UITableView(View.Bounds, UITableViewStyle.Plain);
_yourTableView.AutoresizingMask = UIViewAutoresizing.FlexibleHeight;
_yourSource = new YourUITableViewSourceDerivedClass();
_yourTableView.Source = _yourSource;
TableView = _yourTableView;
}
public override void ViewDidAppear(bool animated)
{
// Well, of course you call a method in your source to do this, but this is the idea:
_yourSource.textFieldOnFirstRow.BecomeFirstResponder();
}
}
in your viewdidload, put this:
[yourTextField becomeFirstResponder];
I am not sure at all is this works :S
please tell if it does/don't :)
You can try setting up a notification for when your cell view is loaded or appeared. Then you can call the becomeFirstResponder on the field after the notification is fired off.