How can I access NavigationController inside UITableviewSource class?
On Row selection I want to navigate to another UIController.
This is my code,
public class RootTableSource : UITableViewSource
{
IList<VendorDetails> tableItems;
string cellIdentifier = "UIViewController";
ReportsList reportList;
AddNewReport addnewReport;
public RootTableSource()
{
}
public RootTableSource (IEnumerable<VendorDetails> items)
{
tableItems = items.ToList ();
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
tableView.DeselectRow (indexPath, true);
// Redirect to another UIController....
}
public VendorDetails GetItem (int id)
{
return tableItems [id];
}
}
have you instance UINavigationController in AppDelegate ?
like this...
#property (strong, nonatomic) UINavigationController *navigationViewController;
then you should can access UINavigationController from AppDelegate delegate
#import "AppDelegate.h"
#implementation yourClassName
-(void)functionName{
AppDelegate *appdelegate = (AppDelegate*)[[UIApplication sharedApplication]delegate];
appdelegate.navigationViewController; //your UINavigationController
[appdelegate.navigationViewController pushViewController:yourUIViewController animated:YES];
}
#end
wish help ~
edit:
Sorry i have never use Xamarin before
so i think this is a bad way to implement ...
but it look work
AppDelegates.cs
[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
UIWindow window;
HomeScreen home;
public static UINavigationController navigation;
//set navigation public and static
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
window = new UIWindow (UIScreen.MainScreen.Bounds);
home = new HomeScreen ();
navigation = new UINavigationController(home);
window.RootViewController = navigation;
window.MakeKeyAndVisible ();
return true;
}
}
yourClassName.cs
AppDelegate.navigation
//access navigation
wish help again ...
The way I do this is by passing a reference to the TableViewController when I create my Source. Then the Source can use this reference to access it's parent's NavigationController.
UITableViewController _parent;
public RootTableSource (IEnumerable<VendorDetails> items, UITableViewController parent)
{
tableItems = items.ToList ();
_parent = parent;
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
tableView.DeselectRow (indexPath, true);
_parent.NavigationController.PushViewController(...);
}
Related
I writing xamarin.ios app and using TableView.
I want to Create a custom cell.
So in the designer, I created it with this properties
I try to use it then in TableSource
Like this
public class ExperienceSource : UITableViewSource
{
Experience[] TableItems;
//NSString cellIdentifier = new NSString("TableCell");
ExperienceController owner;
public ExperienceSource(Experience[] items, ExperienceController owner)
{
TableItems = items;
this.owner = owner;
}
public override nint NumberOfSections(UITableView tableView)
{
return 1;
}
public override nint RowsInSection(UITableView tableview, nint section)
{
return TableItems.Length;
}
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
var cell = tableView.DequeueReusableCell("cell_id", indexPath) as ExperienceCell;
//Experience item = TableItems[indexPath.Row];
/*if (cell == null)
{
cell = new ExperienceCell(cellIdentifier);
}*/
cell.UpdateCell(TableItems[indexPath.Row].title, TableItems[indexPath.Row].price);
//---- if there are no cells to reuse, create a new one
/*if (cell == null)
{
cell = new ()(CellIdentifier);
}*/
return cell;
}
}
And Here is class for ExperienceCell
public partial class ExperienceCell : UITableViewCell
{
public ExperienceCell (IntPtr handle) : base (handle)
{
}
internal void UpdateCell(string title, string price)
{
ExperienceTitle.Text = title;
ExperincePrice.Text = price;
}
}
When I run app, I got this error
unable to dequeue a cell with identifier cell_id - must register a nib
or a class for the identifier or connect a prototype cell in a
storyboard
How I can fix this?
Thank's for help.
You are missing the registration of the UITableViewCell in the UITableView.
Please add something like this in your ViewController (the important part is the RegisterNibForCellReuse sentence):
public override void ViewDidLoad()
{
base.ViewDidLoad();
MyTableView.RegisterNibForCellReuse(UINib.FromName(nameof(ExperienceCell), NSBundle.MainBundle), "cell_id");
MyTableView.Source = new ExperienceSource(..., ...);
// .. your code
}
This is a necessary step when you declare your UITableViewCells outside the UITableView.
Is it possible to hide a status bar in a PageRenderer?
I tried setting these in Info.plist
<key>UIStatusBarHidden</key>
<true/>
<key>UIViewControllerBasedStatusBarAppearance</key>
<true/>
And then overriding PrefersStatusBarHidden in the PageRenderer as
public override bool PrefersStatusBarHidden()
{
return true;
}
If I set UIViewControllerBasedStatusBarAppearance in Info.plist to false, it is hidden on all pages.
How can I fix this?
You should use a custom UINavigationController instead of the system one, like this sample:
In AppDelegate.cs:
UINavigationController navController;
UIWindow window;
public override bool FinishedLaunching (UIApplication application, NSDictionary launchOptions)
{
navController = new UINavigationController (new TestViewCtonroller ());
// create a new window instance based on the screen size
window = new UIWindow (UIScreen.MainScreen.Bounds);
window.RootViewController = navController;
window.MakeKeyAndVisible ();
return true;
}
MyNavigationController.cs:
public class MyNavigationController : UINavigationController
{
public MyNavigationController (UIViewController rootController) : base(rootController)
{
}
public override UIViewController ChildViewControllerForStatusBarHidden ()
{
return TopViewController;
}
public override UIViewController ChildViewControllerForStatusBarStyle ()
{
return TopViewController;
}
}
TestViewCtonroller.cs:
public class TestViewCtonroller : UIViewController
{
public TestViewCtonroller ()
{
this.View.BackgroundColor = UIColor.Red;
}
public override UIStatusBarStyle PreferredStatusBarStyle ()
{
return UIStatusBarStyle.LightContent;
}
public override bool PrefersStatusBarHidden ()
{
return true;
}
}
Hope it can help you.
Consider this simple example:
public partial class TableViewController : UITableViewController
{
public TableViewController (IntPtr handle) : base (handle)
{
}
protected override void Dispose (bool disposing)
{
Console.WriteLine (String.Format ("{0} controller disposed - {1}", this.GetType (), this.GetHashCode ()));
base.Dispose (disposing);
}
public override void ViewDidLoad ()
{
//TableView.Source = new TableSource(this);
TableView.Source = new TableSource();
}
}
public class TableSource : UITableViewSource {
private TableViewController controller;
string CellIdentifier = "TableCell";
public TableSource ()
{
}
public TableSource (TableViewController controller)
{
this.controller = controller;
}
public override nint RowsInSection (UITableView tableview, nint section)
{
return 1;
}
public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
{
UITableViewCell cell = tableView.DequeueReusableCell (CellIdentifier);
//if there are no cells to reuse, create a new one
if (cell == null){
cell = new UITableViewCell (UITableViewCellStyle.Default, CellIdentifier);
}
cell.TextLabel.Text = "test";
return cell;
}
}
I've noticed that the view controller (TableViewController) is never released. The table view controller has a reference to the data source, but the data source also has a reference to the table view controller.
With TableView.Source = new TableSource(); the view controller gets released, with TableView.Source = new TableSource(this); it's not.
How should this reference cycle be broken so that everything get released?
Edit:
Now I tried the WeakReference:
Through using a WeakReference the Dispose method is called, when the view controller is popped off the navigation stack.
In ViewDidLoad:
TableView.Source = new TableSource(new WeakReference<TableViewController> (this));
In the datasource:
private WeakReference<TableViewController> controller;
public TableSource (WeakReference<TableViewController> controller)
{
this.controller = controller;
}
I built this into my real project, but how can I access my controller? I get the message
Type 'System.WeakReference' does not contain a definition for 'xxx' and no extension method 'xxx' of type 'System.WeakReference' could be found. Are you missing an assembly reference?
You work with Xamarin, as I see? Have you tried WeakReference?
https://msdn.microsoft.com/en-us/library/system.weakreference(v=vs.110).aspx
PS:
private WeakReference weakController;
to set:
this.weakController = new WeakReference(controller);
to get:
if (weakController.isAlive)
{
TableViewController controller = weakController.Target as TableViewController;
}
change
public partial class TableViewController : UITableViewController
to
public partial class TableViewController : UITableViewController, UITableViewSource
and in ViewDidLoad just do
self.TableView.Source = self;
the source property is a weak reference internally already so your have no problem of managing that. It is a convenience property to make the tbaleviewcontroller the delegate and datasource altogether. (Just like you would in native iOS)
You can move the methods into the controller itself which would be less of a hassle than WeakReference. Then mark them with export attribute which then allows you to set the UITableView.WeakDataSource property to the controller itself.
[Export("tableView:numberOfRowsInSection:")]
public nint RowsInSection (UITableView tableview, nint section)
[Export("tableView:cellForRowAtIndexPath:")]
public UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
Once they are moved you can attach the datasource:
public override void ViewDidLoad ()
{
TableView.WeakDataSource = this;
}
I'm using a UITableViewController.
Instead of displaying an alert view I want to be redirected to another page after i touch a particular row in a table.
I have this code but it doesn't work
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
new UIAlertView("Row Selected", tableItems[indexPath.Row], null, "OK", null).Show();
tableView.DeselectRow (indexPath, true); // normal iOS behaviour is to remove the blue highlight
//call the next screen
if(this.accountRegistration== null) {
this.accountRegistration = new AccountRegistration();
}
this.NavigationController.PushViewController(this.accountRegistration, true);
}
I'm changing my answer because I didn't realize you were using a UITableViewController.
In your AppDelegate.cs file you need to set the rootNavigationController to a new UINavigationController:
[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
// class-level declarations
UIWindow window;
UINavigationController rootNavigationController;
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
this.window = new UIWindow (UIScreen.MainScreen.Bounds);
//---- instantiate a new navigation controller
this.rootNavigationController = new UINavigationController();
this.rootNavigationController.PushViewController(new MyUITableViewController(), false);
//---- set the root view controller on the window. the nav
// controller will handle the rest
this.window.RootViewController = this.rootNavigationController;
this.window.MakeKeyAndVisible ();
return true;
}
....
From that point on, your UITableViewController should always have a reference to this.NavigationController.
This code works well
[Register ("AppDelegate")]
public partial class AppDelegate : UIApplicationDelegate
{
// class-level declarations
UIWindow window;
UINavigationController rootNavigationController;
public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
this.window = new UIWindow (UIScreen.MainScreen.Bounds);
//---- instantiate a new navigation controller
this.rootNavigationController = new UINavigationController();
this.rootNavigationController.PushViewController(new MyUITableViewController(), false);
//---- set the root view controller on the window. the nav
// controller will handle the rest
this.window.RootViewController = this.rootNavigationController;
this.window.MakeKeyAndVisible ();
return true;
}
I have a navigation controller. Inside it i have a view controller that has a button. When the button is clicked a popover shows with a tableview of items.
When an item is selected i want to either navigate to a different view controller or open up a view controller on top of the current one.
I hope i've made my objectives clear.
Below is my current code:
private UITableView tableView;
private List list;
private class TableViewDelegate : UITableViewDelegate
{
private List<string> list;
public TableViewDelegate(List<string> list)
{
this.list = list;
}
public override void RowSelected (
UITableView tableView, NSIndexPath indexPath)
{
//THIS IS WHERE I AM CURRENTLY PUTTING THE NAVIGATION CONTROLLER PUSHVIEWCONTROLLER. BUT ITS NOT WORKING !!!
}
}
private class TableViewDataSource : UITableViewDataSource
{
static NSString kCellIdentifier =
new NSString ("MyIdentifier");
private List<string> list;
public TableViewDataSource (List<string> list)
{
this.list = list;
}
public override int RowsInSection (
UITableView tableview, int section)
{
return list.Count;
}
public override UITableViewCell GetCell (
UITableView tableView, NSIndexPath indexPath)
{
UITableViewCell cell =
tableView.DequeueReusableCell (
kCellIdentifier);
if (cell == null)
{
cell = new UITableViewCell (
UITableViewCellStyle.Default,
kCellIdentifier);
}
cell.TextLabel.AdjustsFontSizeToFitWidth = true;
cell.TextLabel.Font = UIFont.FromName("Helvetica", 14.0f);
cell.TextLabel.Text = list[indexPath.Row];
return cell;
}
}
in monotouch you should use
class TableDelegate : UITableViewDelegate
{
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
this.YourNavigationController.PushViewController(yourViewController,true);
}
}
also i recommend you to use monotouch.dialog
in your table source declare an event like this:
public class TableSourceAnimales : UITableViewSource
{
public event RowSelectedEventHandler RowSelectedEvent;
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
if (this.RowSelectedEvent != null) {
RowSelectedEvent (indexPath);
}
}
}
and in your uiviewcontroller like this
namespace yournamespace
public delegate void RowSelectedEventHandler(MonoTouch.Foundation.NSIndexPath indexpath);
public partial class yourclass : UIViewController
{
public override void ViewDidLoad ()
{
TableViewDataSource tablelist = new TableViewDataSource (yourlist);
table.Source = tablelist;
table.ReloadData ();
table.RowSelectedEvent += tablelist_RowSelectedEvent;
}
public void tablelist_RowSelectedEvent (NSIndexPath indexpath)
{
this.YourNavigationController.PushViewController(yourViewController,true);
//or what you want to do
}
}
Check which row is clicked in this function:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
And then show your view controller.
This will do the trick:
- (void)tableView:(UITableView *)tblView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
YourViewController *vc = [[[YourViewController alloc] initWithNibName:#"YourViewController" bundle:[NSBundle mainBundle]] autorelease];
[self.navigationController pushViewController:vc animated:YES];
}
Something like this in mono:
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
var DetailViewController = new DetailViewController ();
// Pass the selected object to the new view controller.
controller.NavigationController.PushViewController(DetailViewController, true);
}
actually its like in Obj-C only the syntax is a bit different. Try to do it yourself next time, its easy.