As usual I encountered problem it is not well explained in internet and Apple documentation is limited.
I have UICollectionView with cells. I wanted to present movie poster inside each cell.I imported TVUIkit and addedd framework inside project settings.
My FilmCelkaCollectionViewCell.h contains
API_AVAILABLE(tvos(12.0))
#interface FilmCelkaCollectionViewCell : UICollectionViewCell
#property (strong, nonatomic) IBOutlet TVPosterView *widokPlakatu;
#end
FilmCelkaCollectionViewCell.m does not contain any methods.
And in my collectionviewcontroller cell definition is as follow:
- (nonnull __kindof UICollectionViewCell *)collectionView:(nonnull UICollectionView *)collectionView cellForItemAtIndexPath:(nonnull NSIndexPath *)indexPath {
UICollectionViewCell *celka = (FilmCelkaCollectionViewCell*)[collectionView dequeueReusableCellWithReuseIdentifier:#"filmCela" forIndexPath:indexPath];
celka.backgroundColor =[UIColor greenColor];
return celka;
}
I added green background to see better area in simulator. But problem is I don't know how to access property TVPosterView *widokPlakatu - the only thing I can access is celka.contentView. I watched WWDC2018 video about "What's new in tvos12" and still have questions:
Does TVPosterView acts like CollectionViewCell and I can use it with UICollectionView without cells?
Is TVPosterView some special #property that cannot be accessed and must be initialized somewhere,somehow? I defined property in storyboard.
Is it forbidden to put views inside the CollectionViewCell?
OK I found solution by accident.
This
FilmCelkaCollectionViewCell *celka = [collectionView dequeueReusableCellWithReuseIdentifier:#"filmCela" forIndexPath:indexPath];
will work while typecasting will not
UICollectionViewCell *celka = (FilmCelkaCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:#"filmCela" forIndexPath:indexPath];
Related
And the value of the labels are null as well.
I'm not really sure what's going on.
These are my classes/codes
#interface CustomEventCell : UITableViewCell{
}
#property (nonatomic, weak) IBOutlet UILabel *participant1label;
#property (nonatomic, weak) IBOutlet UILabel *participant2label;
#property (nonatomic, weak) IBOutlet UILabel *status;
#end
Event model is
#interface Event : NSObject{
}
#property NSNumber *matchId;
#property NSString *participant1, *participant2,
-(id)init;
#end
this is the tableview that fills up the cell
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"EventCell";
CustomEventCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[CustomEventCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// events is a NSMutableArray with Event instances
Event *event = [events objectAtIndex:indexPath.row];
cell.participant1label.text = event.participant1;
return cell;
}
Here's my setup
I must be missing something as I have another uitableview and it populatees the custom without problems. I compared them and they're identical. I even tried going back to the regular label and it would fill that up but not this custom one.
EDIT:
Modified the wrong copied code.
I wrote a simple little test app attempting to replicate what you want to see working. I have made it available here using Storyboards. If you cannot figure it out from this, then perhaps you can take the test app and modify it so that it replicates the bad behavior you are seeing.
My best guess as to what might be going on is that when you initialize your cell, it is not connected to a view in a xib.
Try setting a breakpoint at:
cell.participant1label.text = event.participant1;
and verify that cell.participant1label is not nil by doing:
NSLog( #"cell.participant1label: %#", cell.participant1label );
I had a small bug in which none of my custom labels were showing up and cell.participant1label was nil. The cause was that I had not set the Identifier for the custom table view cell to 'EventCell'. So, I might suggest rechecking that and making sure the identifier really does match between your code and the XIB.
I'm trying to create a custom UITableViewCell.
From XCode 4.6 interface builder, I've set the Style property of the cell to Custom. And added controls to the cell using drag and drop. 2 UILables and a UIButton. It looks like this.
I created a separate class deriving from UITableViewCell to assign the properties of the 3 UI elements and make the changes there. I've set the cell's custom class as DashboardCell from the Identity Inspector as well.
DashboardCell.h
#import <UIKit/UIKit.h>
#interface DashboardCell : UITableViewCell
#property (weak, nonatomic) IBOutlet UILabel *numberOfMails;
#property (weak, nonatomic) IBOutlet UILabel *mailType;
#property (weak, nonatomic) IBOutlet UIButton *numberOfOverdueMails;
#end
DashboardCell.m
#import "DashboardCell.h"
#implementation DashboardCell
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
if (self) {
[self.numberOfOverdueMails setBackgroundColor:[UIColor colorWithRed:244/255.0f green:119/255.0f blue:125/255.0f alpha:1.0f]];
[self.numberOfOverdueMails setTitle:#"lol" forState:UIControlStateNormal];
}
return self;
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
}
#end
In the TableViewController, I have modified the following method to return my custom cell.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
DashboardCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[DashboardCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
return cell;
}
My problem is even though the custom button shows up, the changes I've done (changing the background color of the button, changing the title of one UILabel) aren't showing up. What seems to be the mistake here?
The method initWithStyle:reuseIdentifier: will not be called because you're using interface builder to create a cell.
You can set the background color and title by overriding the method awakeFromNib.
You can also set these in the method tableView:cellForRowAtIndexPath:
If you get your cell from a xib or storyboard, dequeueReusableCellWithIdentifier:forIndexPath: will always return a cell -- if one exists it will reuse it, if not it will create one from the template in IB. Therefore, your if(cell ==nil) clause will never be satisfied, and in fact is no longer needed. If you want to use an init method, then use initWithCoder:
I have a UITableView with 5 single grouped cells, allowing users to access specific further screens from each option. Users will then return to this screen and I want to be able to place a checkmark against the last selected cell and turn off any previous checkmarks.
I am trying to achieve this in didSelectRowAtIndexPath: but can't seem to get it right.
There are a few answers available for dynamic cells but nothing for static, can anyone help with this?
There are a number of ways to manage this, but one of the easier things to do is to store references to the cells in a collection so that you can easily send messages to all the cells. For example, you could add a property like the following:
#property (strong, nonatomic) IBOutletCollection(NSArray) *cells;
#property (strong, nonatomic) IBOutletCollection(UITableViewCell) NSArray *cells;
and connect it to each of the cells in your nib file or storyboard. (If you're not using Interface Builder, drop the IBOutletCollection, and populate the array yourself wherever you create the cells.)
Then you can manage selection as follows:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
for (UITableViewCell *currCell in self.cells)
{
currCell.accessoryType = UITableViewCellAccessoryNone;
}
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
selectedCell.accessoryType = UITableViewCellAccessoryCheckmark;
}
Correct syntax for IBOutletCollection is:
#property (strong, nonatomic) IBOutletCollection(UITableview) NSArray *cells;
I'm trying to create a couple of small, static tableviews and add them to a panel that I have which slides in and out. The panel is created programmatically so I can't lay the tableviews out inside it via storyboard, and anyway I'm not sure if this is possible anyhow: It seems the only way you can lay out static tableviews that work is in a tableviewcontroller, which takes up the whole screen.
If you can't tell I'm pretty new to iOS dev so if I'm not understanding some fundamental concepts here please feel free to explain.
Of course is possible. Here is how it can be done:
Drag a TableViewController to your storyboard.
Set its Size to Freeform, add an identifier and uncheck Resize View From NIB
Select the tableview and set its content to Static Cells. Design your cells.
Set its size
Now, wherever you need to instantiate it do it like this:
// I am using a UITableViewController as an example here
// you probably would like to set your actual controller subclass instead
UITableViewController *tableViewController = [[UIStoryboard storyboardWithName:#"MainStoryboard" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:#"staticTv"];
UITableView *tableView = tableViewController.tableView;
[self.view addSubview:tableView]; // Or add it to whatever view
Enjoy :)
A UITableViewController isn't necessary to provide the functionality you need to manage a UITableView. I think what you're looking for is the "Delegate" pattern. Any UIViewController can be assigned to be the delegate of the UITableView. For example, I have a "static" table that shows some options in an app I am working on:
#interface LBOptionsViewController : UIViewController <UITableViewDataSource,
UITableViewDelegate>
If you're creating your table views programmatically, you'll probably either be creating them in viewDidLoad or loadView (if you're creating the actual view yourself). After you've created your tableView, assign the delegates:
self.tableView.delegate = self;
self.tableView.dataSource = self;
Then your UIViewController subclass will receive the data delegate messages like:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
Not sure if this helps you. I have not played with Storyboards much yet.
EDIT: #Alladinian has the right answer! If you're using an property for the view controller make sure you allocate it if you need it to be called by other methods.
I've yet to find a usefully reason to use static table view cells over dynamic. Table views were pretty scary when I started iOS programming. I used sqlite in my first app YIKES.
So yeah, you should just import the UITableView Data Source and Delegate and follow up by adding the table view to your panel (assuming it's a uiview and you can add the table view as a subview).
Anyways in your ViewController.h include UITableViewDataSource and UITableViewDelegate.
#interface ViewController : UIViewController<UITableViewDataSource,UITableViewDelegate>
Next, add properties for a UITableView and an NSMutableArray:
#property (strong, nonatomic) UITableView* tableView;
#property (strong, nonatomic) NSMutableArray* tableViewContents;
In your ViewController's .m:
#synthesize tableView;
#synthesize tableViewContents;
inside ViewDidLoad:
self.tableViewContents = [NSMutableArray arrayWithObjects:#"Cell 1",#"Cell 2",#"Cell 3",nil];
[self.tableView setDelegate:self]
[self.tableView setDatasource:self]
In the .m file:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return self.tableViewContents.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
NSUInteger row = [indexPath row];
index = row;
static NSString *cellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
}
cell.textLabel.text = [tableViewContents objectAtIndex:row];
return cell;
}
I occasionally find myself copy/pasting custom cells between UITableViews in my storyboard which is slowly becoming a maintenance nightmare (i.e., a simple change must now be made to each custom cell across several UITableViews).
Is it possible to create one custom cell in a storyboard or xib file and then reference it from multiple UITableViews? I'm thinking there's got to be a way to specify a NIB name for a static/prototype cell similar to how you can specify a NIB name for a UIViewController when editing a normal xib.
BTW... I know how to do this via code. What I'm looking for is a way to do this from within the storyboard editor itself.
I know of a way, but it does require a little code in a custom class. Make a subclass of UITableViewCell that loads itself from a nib. Then just set the class of your cells to this subclass. For a good method of having a view replace itself with a different version loaded from a nib see this blog post.
Actually, you don't have to create a custom class. If you're coding for version 4.0 and up, you can use a UINib to create it. You can also cache it to improve performance.
UIViewController.h
#property (nonatomic, retain) UINib *cellNib;
#property (nonatomic, retain) IBOutlet MyCustomTableViewCell *customCell;
UIViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
// Cache the tableviewcell nib
self.cellNib = [UINib nibWithNibName:#"MyCustomTableViewCell" bundle:nil];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"MyCustomTableViewCell";
MyCustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
[self.cellNib instantiateWithOwner:self options:nil];
cell = customCell;
self.customCell = nil;
}
// Set title and such
}
Don't forget about releasing it in dealloc if not using ARC