I m doing a Xamarin iOS project. I have a UITableView I wan't to select a row when I click in a button and display the information linked to the cell selected.
Like this :
I don't know how to pass data from the first controller to the second when I clicked on the button. How can I do that ?
Here is my TableDataSource :
private const string cellIdentifier = "ProductCell";
private ProductListViewController _controller;
private List<Product> _products;
public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
{
ProductCell cell = (ProductCell)tableView.DequeueReusableCell(cellIdentifier);
if (cell == null)
cell = new ProductCell(new NSString(cellIdentifier));
var record = _products[(int)indexPath.Row];
cell.UpdateCell(record.Image, indexPath.Row);
cell.Tag = indexPath.Row;
return cell;
}
Here is my product custom cell :
public partial class ProductCell : UITableViewCell
{
public static readonly NSString Key = new NSString("ProductCell");
public ProductCell(IntPtr handle) : base(handle)
{
}
public ProductCell(NSString cellId)
{
}
public void UpdateCell(string imageName, nint tag)
{
this.ProductImage.Image = UIImage.FromBundle(imageName);
this.MoreBtn.Tag = tag;
}
}
Edit :
Here is my code for the navigation, I will place it in the action button method. But for now I don't know where to create this method :
var storyboard = UIStoryboard.FromName("Main", null);
var controller = storyboard.InstantiateViewController("ProductDetailViewController") as ProductDetailViewController;
// Here I Will pass the data to the controller
_controller.NavigationController.PushViewController(controller, true);
In GetCell--
cell.yourbtn.Tag = indexPath.Row;
cell.getDetailButton.TouchUpInside -= handler;
cell.getDetailButton.TouchUpInside += handler;
Here is code for button event handler
void handler(Object sender, EventArgs args)
{
nint tag = btn.Tag;
var storyboard = UIStoryboard.FromName("Main", null);
var controller = storyboard.InstantiateViewController("ProductDetailViewController") as ProductDetailViewController;
// datatopass = yourlistofdata[tag]; Here I Will pass the data to the controller -
_controller.NavigationController.PushViewController(controller, true);
}
I am trying to make a custom TableView that has big heights, but when i run it i can only access 2 of my 5 rows in the table(in the example i provided)
Here is a screen shot of how i am viewing my table : http://i.imgur.com/1dsPNj5.png
Here is the link to my Table Source : http://pastebin.com/B7U2BEd8
Here is my view controller :
unclass[] lol= new unclass[amount];
for (nint i = 0; i < amount; i++) {
lol [i] = new unclass ();
Console.WriteLine ("item created");
}
UITableView _table;
_table = new UITableView{ Frame = new CoreGraphics.CGRect (0, 30, View.Bounds.Width, 3000),Source= new TableSource(lol) };
_table.SeparatorStyle = UITableViewCellSeparatorStyle.None;
for (nint i = 0; i < amount; i++) {
lol [i].imager = await this.LoadImage (links[i]); //loads image from the net to table
}
View.AddSubview (_table);
}
I really don't understand why this is happening
Your TableSource is not the problem, I tested it with a blank table.
Also as Jason said you will need to change the table's frame height to "View.Bounds.Height - 30" -30 to compensate for your Y position. I created a simple example below that show all 5 cells. So it might be the way that you are adding the table or if there is anything else in the viewController. Are you able to post more of your view controller's code?
using UIKit;
using CoreGraphics;
using System;
using Foundation;
namespace SO_Xam_actvity
{
public class bigTableViewController : UIViewController
{
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
UITableView _table;
_table = new UITableView{ Frame = new CGRect (0, 30, View.Bounds.Width, View.Bounds.Height-30),Source= new TableSource(new [] {1,1,1,1,1}) };
_table.SeparatorStyle = UITableViewCellSeparatorStyle.None;
View.AddSubview (_table);
}
}
public class TableSource : UITableViewSource
{
int[] tableItems;
string cellIdentifier = bigTableViewCell.Key;
public TableSource (int[] items)
{
tableItems = items;
}
public override nint RowsInSection (UITableView tableview, nint section)
{
return tableItems.Length;
}
public override nfloat GetHeightForRow (UITableView tableView, NSIndexPath indexPath)
{
return 200;
}
public override UITableViewCell GetCell (UITableView tableView, NSIndexPath indexPath)
{
var cell = tableView.DequeueReusableCell (cellIdentifier) as bigTableViewCell;
if (cell == null) {
cell = new bigTableViewCell();
}
cell.DetailTextLabel.Text = $"{indexPath.Row}";
return cell;
}
}
public class bigTableViewCell : UITableViewCell
{
public static readonly NSString Key = new NSString ("bigTableViewCell");
public bigTableViewCell () : base (UITableViewCellStyle.Value1, Key)
{
TextLabel.Text = "TextLabel";
}
}
}
Working with a UICollectionView in Xamarin just as I have before but running into a strange problem -- When the view containing the collection loads, I see the cells for a short moment and then they disappear. I double checked the ContentSize of the CollectionView and apparently it's defaulting to 0 width, 0 height but setting it manually doesn't seem to solve the problem. The CollectionView seems to stick around (if I set the background color to black I see a black View in the parent) but the cells are disappearing
Parent View (UIView subclass):
UICollectionViewFlowLayout layout = new UICollectionViewFlowLayout ();
layout.ItemSize = new SizeF (274, 281);
layout.MinimumInteritemSpacing = 3;
layout.ScrollDirection = UICollectionViewScrollDirection.Horizontal;
var haulCollection = new HaulCollectionController(layout);
haulCollection.CollectionView.Frame = new RectangleF (0, cellHeader.Frame.Bottom, cellHeader.Frame.Width, 281);
AddSubview(haulCollection.CollectionView);
UICollectionViewController:
public class HaulCollectionController : UICollectionViewController
{
public HaulCollectionController (UICollectionViewLayout layout) : base (layout)
{
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
CollectionView.BackgroundColor = UIColor.Clear;
CollectionView.RegisterClassForCell (typeof(HaulCollectionCell), HaulCollectionCell.Key);
}
public override int NumberOfSections (UICollectionView collectionView)
{
return 1;
}
public override int GetItemsCount (UICollectionView collectionView, int section)
{
return 6;
}
public override UICollectionViewCell GetCell (UICollectionView collectionView, NSIndexPath indexPath)
{
var cell = collectionView.DequeueReusableCell (HaulCollectionCell.Key, indexPath) as HaulCollectionCell;
return cell;
}
public override bool ShouldHighlightItem (UICollectionView collectionView, NSIndexPath indexPath)
{
return false;
}
}
UICollectionViewCell:
public class HaulCollectionCell : UICollectionViewCell
{
public static readonly NSString Key = new NSString ("HaulCollectionCell");
public UILabel Retailer { get; set; }
public UILabel Brand { get; set; }
public UILabel ItemName { get; set; }
[Export ("initWithFrame:")]
public HaulCollectionCell (RectangleF frame) : base (frame)
{
BackgroundColor = UIColor.Cyan;
var infoOverlay = new UIView (new RectangleF(0, Frame.Height-60, Frame.Width, 55)) {
BackgroundColor = UIColor.FromRGBA(255, 255, 255, 153)
};
Retailer = new UILabel (new RectangleF(15,10,100,22)) {
Font = ViewHelpers.GetFont(20, false),
Text = "DICK'S"
};
Brand = new UILabel (new RectangleF(Retailer.IntrinsicContentSize.Width + 10, 10, 100,22)) {
Font = ViewHelpers.GetFont(20, true),
Text = "Nike"
};
ItemName = new UILabel (new RectangleF(15, Brand.Frame.Bottom + 5, 200,30)) {
Font = ViewHelpers.GetFont(26, false),
Text = "Windrunner Tech Fleece"
};
infoOverlay.AddSubviews (Retailer,Brand,ItemName);
ContentView.Add (infoOverlay);
}
}
can't figure out exactly why I can't get the cells to display...
I Have the following viewcontroller with a tableview and a custom cell:
using System;
using System.Drawing;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Linq;
using System.Threading;
using System.Data;
using System.IO;
using Mono.Data.Sqlite;
using System.Collections.Generic;
using Zurfers.Mobile.Core;
using AlexTouch.MBProgressHUD;
using System.Collections;
namespace Zurfers.Mobile.iOS
{
public partial class iPhoneHotelSearchViewController : UIViewController
{
MBProgressHUD hud;
public string Destination {
get;
set;
}
public DateTime CheckInDate {
get;
set;
}
public DateTime CheckOutDate {
get;
set;
}
public int Rooms {
get;
set;
}
public iPhoneHotelSearchViewController (IntPtr handle) : base (handle)
{
}
public override void ViewDidLoad ()
{
base.ViewDidLoad ();
hud = new MBProgressHUD(this.View);
hud.Mode = MBProgressHUDMode.Indeterminate;
hud.LabelText = "Loading...";
hud.DetailsLabelText = "Searching Hotel";
this.View.AddSubview(hud);
hud.Show(true);
}
public override void ViewDidAppear (bool animated) {
base.ViewDidAppear (animated);
SearchHotel ();
}
public void SearchHotel (){
Hotel hotel = new Hotel();
var distribution = new HotelDistribution[]{new HotelDistribution(){ Adults = 1, Children = 0, ChildrenAges = new int[0]} };
var items = hotel.SearchHotels(Convert.ToDateTime("2013-08-08"),Convert.ToDateTime("2013-09-09 "),"(MIA)", distribution,"","","",0);
List<DtoHotelinformation> data = new List<DtoHotelinformation>();
foreach (var item in items)
{
DtoHotelinformation DtoHotelinformation = new DtoHotelinformation();
DtoHotelinformation.code = item.Code.ToString();
DtoHotelinformation.price = item.Price.ToString();
DtoHotelinformation.title = item.Name.ToString().ToTitleCase();
DtoHotelinformation.subtitle = item.Address.ToString();
DtoHotelinformation.rating = item.Rating.ToString();
DtoHotelinformation.imageUlr = item.ImageUrl;
data.Add(DtoHotelinformation);
}
hud.Hide(true);
hud.RemoveFromSuperview();
HotelSearchTable.Source = new HotelTableSource(data.ToArray());
HotelSearchTable.ReloadData();
}
partial void GoBack (MonoTouch.Foundation.NSObject sender)
{
DismissViewController(true, null);
}
}
}
Now the table source
using System;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
namespace Zurfers.Mobile.iOS
{
public class HotelTableSource : UITableViewSource
{
DtoHotelinformation[] tableItems;
NSString cellIdentifier = new NSString("TableCell");
public HotelTableSource (DtoHotelinformation[] items)
{
tableItems = items;
}
public override int RowsInSection (UITableView tableview, int section)
{
return tableItems.Length;
}
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
//WHAT TO DO HERE
tableView.DeselectRow (indexPath, true); // normal iOS behaviour is to remove the blue highlight
}
public override UITableViewCell GetCell (UITableView tableView, MonoTouch.Foundation.NSIndexPath indexPath)
{
CustomCell cell = tableView.DequeueReusableCell(cellIdentifier) as CustomCell;
if (cell == null)
cell = new CustomCell(cellIdentifier);
cell.UpdateCell(tableItems[indexPath.Row].title, tableItems[indexPath.Row].subtitle, tableItems[indexPath.Row].price,
tableItems[indexPath.Row].imageUlr, tableItems[indexPath.Row].rating );
return cell;
}
public override float GetHeightForRow(UITableView tableView, NSIndexPath indexPath)
{
return 70;
}
}
}
Finally the customcell code:
using System;
using System.Drawing;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using MonoTouch.Dialog.Utilities;
namespace Zurfers.Mobile.iOS
{
public class CustomCell : UITableViewCell, IImageUpdated
{
UILabel headingLabel, subheadingLabel, priceLabel;
UIImageView imageService;
UIImageView star, star2, star3, star4, star5;
public CustomCell (NSString cellId) : base (UITableViewCellStyle.Default, cellId)
{
imageService = new UIImageView();
star = new UIImageView();
star2 = new UIImageView();
star3 = new UIImageView();
star4 = new UIImageView();
star5 = new UIImageView();
headingLabel = new UILabel(){
Font = UIFont.FromName("Verdana-Bold", 14f),
BackgroundColor = UIColor.Clear,
TextColor = UIColor.FromRGB(241, 241, 211)
};
subheadingLabel = new UILabel(){
Font = UIFont.FromName("Verdana-Bold", 8f),
TextColor = UIColor.FromRGB(255, 255, 255),
BackgroundColor = UIColor.Clear
};
priceLabel = new UILabel(){
Font = UIFont.FromName("Verdana", 14f),
TextColor = UIColor.FromRGB(241, 241, 211),
BackgroundColor = UIColor.Clear
};
AddSubview(imageService);
AddSubview(headingLabel);
AddSubview(subheadingLabel);
AddSubview(priceLabel);
AddSubview(star);
AddSubview(star2);
AddSubview(star3);
AddSubview(star4);
AddSubview(star5);
}
public void UpdateCell (string title, string subtitle, string price, string imageUlr, string rating )
{
if (imageUlr != null) {
var u = new Uri(imageUlr);
ImageLoader MyLoader= new ImageLoader(50,50);
imageService.Image = MyLoader.RequestImage(u,this);
} else {
imageService.Image = UIImage.FromFile("generic_no_image_tiny.jpg");
}
headingLabel.Text = title;
subheadingLabel.Text = subtitle;
if (subtitle.Length > 40) {
subheadingLabel.LineBreakMode = UILineBreakMode.WordWrap;
subheadingLabel.Lines = 0;
}
switch (rating) {
case "T":
star.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star2.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
break;
case "S":
star.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star2.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star3.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
break;
case "F":
star.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star2.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star3.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star4.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
break;
case "L":
star.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star2.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star3.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star4.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
star5.Image = UIImage.FromFile("ZurfersMovil-Stars.png");
break;
}
priceLabel.Text = "USD " + price;
priceLabel.Font = UIFont.BoldSystemFontOfSize (16);
}
public void UpdatedImage (Uri uri)
{
imageService.Image = ImageLoader.DefaultRequestImage(uri, this);
}
public override void LayoutSubviews ()
{
base.LayoutSubviews ();
imageService.Frame = new RectangleF(10, 10, 50, 33);
headingLabel.Frame = new RectangleF(70, 4, 240, 25);
subheadingLabel.Frame = new RectangleF(70, 25, 240, 20);
priceLabel.Frame = new RectangleF(220, 45, 100, 20);
star.Frame = new RectangleF(70, 45, 15, 15);
star2.Frame = new RectangleF(85, 45, 15, 15);
star3.Frame = new RectangleF(100, 45, 15, 15);
star4.Frame = new RectangleF(115, 45, 15, 15);
star5.Frame = new RectangleF(130, 45, 15, 15);
}
}
}
I want to open another viewcontroller (iPhoneHotelDetailViewController) when the user touch a cell of the table view. But I don not have any idea of how to do this.
Could you help me please.
Thanks in advance for your help.
Generally, you want a NavigationController to be the "top" element in your app, wrapping all the other controllers.
In your AppDelegate, create a NavigationController, and make it the root of your application.
Then create an instance of your Search controller and push it onto the NavigationController.
Finally, add a NavigationController property to the constructor of your TableSource.
NavigationController nav;
public HotelTableSource (DtoHotelinformation[] items, NavigationController nav)
{
this.nav = nav;
tableItems = items;
}
When you create your TableSource, pass the NavigationController reference in. You can do this because all ViewControllers have a property that points to their NavigationController, if they are contained within one.
HotelSearchTable.Source = new HotelTableSource(data.ToArray(), this.NavigationController);
Finally, in your RowSelected, create an instance of the new ViewController you want to display:
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
//WHAT TO DO HERE
MyDetailController myDetail = new MyDetailController();
nav.PushViewController(myDetail, true);
tableView.DeselectRow (indexPath, true); // normal iOS behaviour is to remove the blue highlight
}
I think that link to UINavigationController (UI component) in UITableViewSource is a bit weird. I recommend to use event-based approach:
Declare event in UITableViewSource and call it on row selection:
public event Action<int> OnRowSelect;
...
public override void RowSelected (UITableView tableView, NSIndexPath indexPath)
{
tableView.DeselectRow (indexPath, true); // normal iOS behaviour is to remove the blue highlight
if (OnRowSelect != null) {
OnRowSelect(indexPath.Row);
}
}
Then, handle event on UIViewController - push new UIViewController:
var source = data.ToArray();
source.OnRowSelect += HandleOnRowSelect;
HotelSearchTable.Source = new HotelTableSource();
HotelSearchTable.ReloadData();
...
void HandleOnRowSelect(int index)
{
var data = items[index];
// Pass data to new view controller and push it
}
Tip to avoid memory leaks: don't forget to unsubscribe from OnRowSelect when you Pop this UIViewController or making new UITableViewSource instance. I.e:
Declare source in as class member;
Unsubscribe from it's event in, for example, ViewWillDisappear:
source.OnRowSelect -= HandleOnRowSelect;
If you are using StoryBord there is a very easy way to do this. You would then pass the data whit in the PrepareForSegue method like this.
public override void PrepareForSegue (UIStoryboardSegue segue, NSObject sender)
{
base.PrepareForSegue (segue, sender);
NSIndexPath indexPatch = tableView.IndexPathForSelectedRow;
if (segue.Identifier.Equals ("showHotelDetail")) {
var vc = segue.DestinationViewController as iPhoneHotelDetailViewController;
if (vc != null) {
//Pass some date to the iPhoneHotelDetailViewController if needed.
vc.hotelName = this.tableItems [indexPatch.Row].hotelName;
}
}
}
In your StoryBoard connect the customCell with the iPhoneHotelDetailViewController and call the segue "showHotelDetail" for example.
I am trying to use Xamarin.iOS. Everything makes sense until I get to customizing UI. How would you create a collection with customized look and feel for the collection control and it's cell controls?
UICollectionView is a bit similar to UITableView. To get the customization you want, you first need to define your custom cell class:
public class AnimalCell : UICollectionViewCell
{
UIImageView imageView;
[Export ("initWithFrame:")]
public AnimalCell (System.Drawing.RectangleF frame) : base (frame)
{
BackgroundView = new UIView{BackgroundColor = UIColor.Orange};
SelectedBackgroundView = new UIView{BackgroundColor = UIColor.Green};
ContentView.Layer.BorderColor = UIColor.LightGray.CGColor;
ContentView.Layer.BorderWidth = 2.0f;
ContentView.BackgroundColor = UIColor.White;
ContentView.Transform = CGAffineTransform.MakeScale (0.8f, 0.8f);
imageView = new UIImageView (UIImage.FromBundle ("placeholder.png"));
imageView.Center = ContentView.Center;
imageView.Transform = CGAffineTransform.MakeScale (0.7f, 0.7f);
ContentView.AddSubview (imageView);
}
public UIImage Image {
set {
imageView.Image = value;
}
}
}
Then you can reference this cell in your UICollectionViewDataSource class by overriding the GetCell method:
public override UICollectionViewCell GetCell (UICollectionView collectionView, MonoTouch.Foundation.NSIndexPath indexPath)
{
var animalCell = (AnimalCell)collectionView.DequeueReusableCell (animalCellId, indexPath);
var animal = animals [indexPath.Row];
animalCell.Image = animal.Image;
return animalCell;
}
For more info, you should checkout this tutorial on Xamarin's website that I pulled these examples from:
http://docs.xamarin.com/guides/ios/user_interface/introduction_to_collection_views
to add a background image, try this (in ViewDidLoad)
myview.BackgroundColor = UIColor.FromPatternImage(UIImage.FromFile("myimage.png"));