The code is a simple collection view with a bunch of images
I ran it and Xcode doesn't argue about anything but the simulator shows a black screen after running the app.
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return recipePhotos.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
static NSString *identifier =#"Cell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
// Configure the cell
UIImageView * recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image=[UIImage imageNamed:[recipePhotos objectAtIndex:indexPath.row]];
return cell;
}
Check collection view datasource outlet, maybe it was not connected with your controller?
Check receipeImageView is not nil.
Did you register your UICollectionViewCell with identifier #"Cell"?
If you don't want black background, you have to set
collectionView.backgroundColor = [UIColor clearColor];
Then you must register the cell
UINib *cellNib = [UINib nibWithNibName:#"yournibname" bundle:nil];
[collectionView registerNib:cellNib forCellWithReuseIdentifier:#"cell"];
Both need to be implemented in viewDidLoad method
I've setup a UICollectionView with a custom cell XIB. I've setup the delegate, data source methods appropriately but upon loading the collection view appears blank with a black screen:
Here is my code for registering the custom xib cell:
[self.collectionView registerClass:[CustomViewCell class] forCellWithReuseIdentifier:#"cvCell"];
Delegate/data source methods:
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 2;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return 4; }
-(CustomViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"cvCell";
CustomViewCell *cell = (CustomViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
return cell;
}
I've also set the class for the custom xib cell:
EDIT:
Collection view layout is set to:
UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
[flowLayout setItemSize:CGSizeMake(50, 29)];
[flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
[self.collectionView setCollectionViewLayout:flowLayout];
The 50,29 refer to the size of the actual custom view xib cell
You should register your custom cell's nib instead of class.
UINib *cellNib = [UINib nibWithNibName:#"cvCell" bundle:nil];
[self.collectionView registerNib:cellNib forCellWithReuseIdentifier:#"cvCell"];
I have added a UILabel on the UICollectionViewCell through the xib.
I have made the necessary objects in the class and connected it appropriately.
In the cellForItemAtIndexPath method i get access to the UILabel declared but the label is always nill.
I can add background color to the Cell programmatically but not via the Xib. I can also add the label programmatically and work with it.
But i cant do anything with the label via the xib.
I have registered the Cell class and the nib.
Would be great if someone could help me out with this issue
the code snippet inside cellforitem-
static NSString *cellIdentifier = #"Cell";
VideoCellCollection *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:cellIdentifier forIndexPath:indexPath];
cell.backgroundColor=[UIColor whiteColor];
[cell clearData];
VideoInfo *video=[dataArray objectAtIndex:indexPath.item];
cell.lblName.text=video.strFileName;
return cell
Code inside viewdidload
UINib *cellNib = [UINib nibWithNibName:#"VideoCellCollection" bundle:nil];
[self.collectionView registerNib:cellNib forCellWithReuseIdentifier:#"Cell"];
[self.collectionView registerClass:[VideoCellCollection class] forCellWithReuseIdentifier:#"Cell"];
Thanks a lot in advance
Try to remove [self.collectionView registerClass:[VideoCellCollection class] forCellWithReuseIdentifier:#"Cell"];
I have a collection view in a storyboard with 4 collection view cell prototypes with the following identifiers: "Cell", "NoAlbumSelectedCell", "NoPhotosCell" and "NoVideosCell".
This is the code I'm using to load the cells:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
if (self.noAlbumSelected) {
return [collectionView dequeueReusableCellWithReuseIdentifier:#"NoAlbumSelectedCell" forIndexPath:indexPath];
}
if ([self.medias count] == 0) {
if ([self.listType isEqualToString:#"photo"]) {
UICollectionViewCell *noPhotosCell = [collectionView dequeueReusableCellWithReuseIdentifier:#"NoPhotosCell" forIndexPath:indexPath];
return noPhotosCell;
} else {
UICollectionViewCell *noVideosCell = [collectionView dequeueReusableCellWithReuseIdentifier:#"NoVideosCell" forIndexPath:indexPath];
return noVideosCell;
}
}
MediaCollectionViewCell *cell = (MediaCollectionViewCell *)[collectionView dequeueReusableCellWithReuseIdentifier:#"Cell" forIndexPath:indexPath];
[self configureCell:cell forItemAtIndexPath:indexPath];
return cell;
}
When I try to display the "NoPhotosCell" cell, I get the following error:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'could not dequeue a view of kind: UICollectionElementKindCell with identifier NoPhotosCell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
I tried to do a clean and rebuild.
Did you add the following lines at the end of viewDidLoad in your viewController?
[self.collectionView registerClass:[MediaCollectionViewCell class] forCellWithReuseIdentifier:#"Cell"];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"NoAlbumSelectedCell"];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"NoPhotosCell"];
[self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"NoVideosCell"];
If you have subclasses UICollectionViewCell, then you should use [YourUICollectionViewSubClass class] in conjunction with the above lines.
You have write following code in viewdidload
// Do any additional setup after loading the view from its nib.
[self.collectionView registerClass:[CollectionViewImageCell class] forCellWithReuseIdentifier:#"Cell"];
Hi i have created one UIViewController in that i added one UICollectionView with CustomCell. Then, i created a uicollectionviewcell class for cell. Finally set the delegate and datasource in storybord itself. But it showing empty page. like in below image
CODE:
- (void)viewDidLoad
{
[super viewDidLoad];
self.collectionview = _collectionview;
self.collectionview.dataSource = self;
self.collectionview.delegate = self;
speakersImages=[[NSMutableArray alloc]init];
// Do any additional setup after loading the view, typically from a nib.
imageLabels=[[NSMutableArray alloc]initWithObjects:#"RB Forum 2013",#"Agenda",#"Speakers",#"Contact",#"Map",#"Websites",#"#Responsible Biz",#"Partners",#"Sustainability",nil];
imagePaths=[[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:#"RBform.png"],[UIImage imageNamed:#"agenda.png"],[UIImage imageNamed:#"speakers.png"],[UIImage imageNamed:#"contact.png"],[UIImage imageNamed:#"map.png"],[UIImage imageNamed:#"website.png"],[UIImage imageNamed:#"twitter.png"],[UIImage imageNamed:#"partners.png"],[UIImage imageNamed:#"sustainability.png"], nil];
[self.collectionview registerClass:[NewCell class] forCellWithReuseIdentifier:#"Cell"];
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
return [imageLabels count];
}
//THE BELOW DELEGATE METHOD DOES NOT GET CALLED!
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
// we're going to use a custom UICollectionViewCell, which will hold an image and its label
//
static NSString *CellIdentifier = #"Cell";
NewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
// make the cell's title the actual NSIndexPath value
cell.labels.text = [NSString stringWithFormat:#"%#",[imageLabels objectAtIndex:indexPath.row]];
// load the image for this cell
NSLog(#"%#",imageLabels);
//NSString *imageToLoad = [NSString stringWithFormat:#"%d.JPG", indexPath.row];
// cell.image.image = [UIImage imageNamed:imageToLoad];
cell.images.image = [imagePaths objectAtIndex:indexPath.row];
return cell;
}
Solution is remove
[self.collectionview registerClass:[NewCell class] forCellWithReuseIdentifier:#"Cell"];
in storybord we dont need this
Code is ok but order is different.Assigning datasource and delegates before array is populated makes the number of cell returned to 0 ,since array is not yet populated
Try like this
speakersImages=[[NSMutableArray alloc]init];
// Do any additional setup after loading the view, typically from a nib.
imageLabels=[[NSMutableArray alloc]initWithObjects:#"RB Forum 2013",#"Agenda",#"Speakers",#"Contact",#"Map",#"Websites",#"#Responsible Biz",#"Partners",#"Sustainability",nil];
imagePaths=[[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:#"RBform.png"],[UIImage imageNamed:#"agenda.png"],[UIImage imageNamed:#"speakers.png"],[UIImage imageNamed:#"contact.png"],[UIImage imageNamed:#"map.png"],[UIImage imageNamed:#"website.png"],[UIImage imageNamed:#"twitter.png"],[UIImage imageNamed:#"partners.png"],[UIImage imageNamed:#"sustainability.png"], nil];
[self.collectionview registerClass:[NewCell class] forCellWithReuseIdentifier:#"Cell"];
[self.collectionview reloadData];
this line is not needed
self.collectionview = _collectionview;
self.collectionview.dataSource = self;
self.collectionview.delegate = self;
also make sure your collection view is connected via outlet
make sure the <UICollectioniewDatasource,UICollectionviewDelegate> is there in the class header
In Your storyboard give your imageview a tag e.g. 1, and your label another tag e.g. 2
Give your cell reuse identifier that you have already gave eg. "Cell"
Now in your storyboard right click on collection view and create datasource and delegate to your viewController or file owner. alternatively you can use <UICollectionViewDataSource,UICollectionViewDelegate> in your viewController and set the delegate and datasource to self.
Now in your viewDidLoad
-(void) viewDidLoad {
self.collectionview.dataSource = self;
self.collectionview.delegate = self;
speakersImages=[[NSMutableArray alloc]init];
// Do any additional setup after loading the view, typically from a nib.
imageLabels=[[NSMutableArray alloc]initWithObjects:#"RB Forum 2013",#"Agenda",#"Speakers",#"Contact",#"Map",#"Websites",#"#Responsible Biz",#"Partners",#"Sustainability",nil];
imagePaths=[[NSMutableArray alloc]initWithObjects:[UIImage imageNamed:#"RBform.png"],[UIImage imageNamed:#"agenda.png"],[UIImage imageNamed:#"speakers.png"],[UIImage imageNamed:#"contact.png"],[UIImage imageNamed:#"map.png"],[UIImage imageNamed:#"website.png"],[UIImage imageNamed:#"twitter.png"],[UIImage imageNamed:#"partners.png"],[UIImage imageNamed:#"sustainability.png"], nil];
}
number of items in collection view
(NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
return [imageLabels count];
}
create cell and reuse
(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionView *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"Cell"];
// make the cell's title the actual NSIndexPath value
UIlabel *label = (UIlabel *) [cell viewWithTag:2]
label.text = [NSString stringWithFormat:#"%#",[imageLabels objectAtIndex:indexPath.row]];
// load the image for this cell
UIImageView *imageView = (UIImageView *) [cell viewWithTag:1]
imageView.image = [imagePaths objectAtIndex:indexPath.row];
return cell;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self.collectionView registerNib:[UINib nibWithNibName:#"NewCell" bundle:nil] forCellWithReuseIdentifier:#"CELL"];
self.collectionview.dataSource = self;
self.collectionview.delegate = self;
self.imageLabels = [NSArray arrayWithObjects:#"RB Forum 2013",#"Agenda",#"Speakers",#"Contact",#"Map",#"Websites",#"#Responsible Biz",#"Partners",#"Sustainability",nil];
self.imagePaths=[NSArray arrayWithObjects::#"RBform.png",#"agenda.png",#"speakers.png",#"contact.png",#"map.png",#"website.png",#"twitter.png",#"partners.png",#"sustainability.png", nil];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView
numberOfItemsInSection:(NSInteger)section
{
return [self.imageLabels count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
NewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"CELL" forIndexPath:indexPath];
cell.labels.text = [self.imageLabels objectAtIndex:indexPath.row]];
cell.images.image = [UIImage imageNamed:[self.imagePaths objectAtIndex:index path.row]];
return cell;
}