Undeclared identifier error in UICollectionView - ios

This is my ViewController.m file's code for Collection view:
- (void)viewDidLoad
{
img = [[NSArray alloc] initWithObjects:#"1.png",#"2.png",#"3.png", nil];
name = [[NSArray alloc] initWithObjects:#"Flag",#"Blue",#"Fish", nil];
[self.collectionview registerNib:[UINib nibWithNibName:#"cell" bundle:nil] forCellWithReuseIdentifier:#"CELL"];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [img count];
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell1 = [collectionview dequeueReusableCellWithReuseIdentifier:#"CELL" forIndexPath:indexPath];
UIImageView *reciveimageview = (UIImageView *)[cell1 viewWithTag:100];
reciveimageview.image = [UIImage imageNamed:[img objectAtIndex:indexPath.row]];
cell1.backgroundView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:[img objectAtIndex:indexPath.row]]];
cell1.cellLabel.text = [name objectAtIndex:indexPath.row];
return cell1;
}
#end
Now it is giving me the error of Undeclared identifier of Cell and Cell1
Don't know why.

Add like this
static NSString *identifier = #"Cell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *recipeImageView=(UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[jsonImagesArr objectAtIndex:indexPath.row]];
[cell addSubview:recipeImageView];

Make sure the cell on the .xib file know what's the type of the cell.
Select the cell on your interface builder
and then on the identity inspector. In your case it should be cell

Have you set the identifier in xib as "CELL"
You need to register your nib/class if you are using a custom cell.
You can do that by
[self.myCollectionView registerNib:[UINib nibWithNibName:#"ShubhCalendarCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"ShubhCalendarCollectionViewCell"];
Make sure your Nib name and identifier are not mis- spelled.
Hope it helps.
Happyy coding.. !!

Related

how to display collectionview in second view when i tap on tableview any cell in first view

hi i am displaying tableview when i tap on tableview any cell i want to display collection view with images.but here i am getting blank view in second view not to display images in collection view.
my code is like this
viewDidLoad{
freshArray=[NSMutableArray arrayWithObjects:[UIImage imageNamed:#"1.png"], [UIImage imageNamed:#"2.png"],[UIImage imageNamed:#"3.png"],[UIImage imageNamed:#"4.png"],[UIImage imageNamed:#"5.png"],[UIImage imageNamed:#"6.png"],[UIImage imageNamed:#"7.png"],[UIImage imageNamed:#"8.png"],[UIImage imageNamed:#"9.png"],nil];
popularArray=[NSMutableArray arrayWithObjects:[UIImage imageNamed:#"10.png"],[UIImage imageNamed:#"11.png"],[UIImage imageNamed:#"12.png"],[UIImage imageNamed:#"13.png"],[UIImage imageNamed:#"14.png"],[UIImage imageNamed:#"15.png"],[UIImage imageNamed:#"16.png"],[UIImage imageNamed:#"17.png"],[UIImage imageNamed:#"18.png"],nil];
AdviceArray=[NSMutableArray arrayWithObjects:[UIImage imageNamed:#"19.png"],[UIImage imageNamed:#"20.png"],[UIImage imageNamed:#"21.png"],[UIImage imageNamed:#"22.png"],[UIImage imageNamed:#"23.png"],[UIImage imageNamed:#"24.png"],[UIImage imageNamed:#"25.png"],[UIImage imageNamed:#"26.png"],[UIImage imageNamed:#"27.png"],nil];
AllitemsArray=[[NSMutableArray alloc]initWithObjects:freshArray,popularArray,AdviceArray,AwesomeArray,CartoonArray, nil];
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath
{
secondViewController *second=[[secondViewController alloc]initWithNibName:#"secondViewController" bundle:nil];
second.recipeImageView.image=[AllitemsArray objectAtIndex:indexPath.row];
second.secCollectionImagesArray=AllitemsArray;
[self.navigationController pushViewController:second animated:YES];
}
secondViewController.m
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [secCollectionImagesArray count];
}
- (MyCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"CELL" forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
UILabel *descLabel = (UILabel *)[cell viewWithTag:110];
[descLabel setText:[secCollectionImagesArray objectAtIndex:indexPath.row]];
recipeImageView.image = [UIImage imageNamed:[secCollectionImagesArray objectAtIndex:indexPath.row]];
int pages = floor(collectionView.contentSize.width / collectionView.frame.size.width) + 1;
[pageControl setNumberOfPages:pages];
return cell;
}
any help Appreciated
You should try like this
UIImageView *recipeImageView = (UIImageView *)[cell.contentView viewWithTag:100];
UILabel *descLabel = (UILabel *)[cell.contentView viewWithTag:110];
Or
It looks like you have subclassed the collectionviewcell then you can access UIImageView and uilabel like this
cell.label=#"text";

collectionview just filling one cell

I'm trying to fill a collectionview with data from an array which I've checked it has the data, but at runtime it's filling just the cell at index 0.
The collectionview is a list of friends in pages of 9 items showing photo and name. The number of items at section is working properly, I mean, if the array has 3 objects, the collectionview displays three cells but just the first one with the photo and name of the object, concretly the last one in the array, not the first one. And the other cells show the prototype cell.
I guess I'm dealing wrong with the indexpath of the collection view, but I have another one in my storyboard and works properly. This other one has only one cell per page, could be something related to this?
I paste my collectionview methods:
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return [self.miListaAmigos count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"friendCell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
UILabel *nameLabel = (UILabel *)[self.view viewWithTag:102];
nameLabel.font = [UIFont fontWithName:#"Ubuntu" size:12.0];
nameLabel.text = [[self.miListaAmigos objectAtIndex:indexPath.row] valueForKey:#"usr_username"];
return cell;
}
you not directly reuse UILabel from self.view, UILabel *nameLabel = (UILabel *)[self.view viewWithTag:102];
try this below code for solve your problem:
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"friendCell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
if(cell == nil)
{
//Create UILabel here
UILabel *nameLabel=[[UILabel alloc]initWithFrame:CGRectMake(5, 5, 310, 20)];
nameLabel.tag=100;
[cell addSubview:nameLabel];
nameLabel.font = [UIFont fontWithName:#"Ubuntu" size:12.0];
}
// Access label and reuse
UILabel *nameLabel = (UILabel *)[cell viewWithTag:100];
nameLabel.text = [[self.miListaAmigos objectAtIndex:indexPath.row] valueForKey:#"usr_username"];
return cell;
}
Check your collectionView alloc and required deleagte:
UICollectionViewDelegate、UICollectionViewDataSource、 UICollectionViewDelegateFlowLayout.
e.g.
UICollectionViewFlowLayout *collectionLayout = [[UICollectionViewFlowLayout alloc] init];
[collectionLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:collectionLayout];
[collectionView registerClass:[CNCollectionViewCell class] forCellWithReuseIdentifier:cellIndetify];
collectionView.delegate = self;
collectionView.dataSource = self;
[self.view addSubview:collectionView];
Your label is in self.view not in the cell... You really should make a subclass of UICollectionViewCell
File -> New -> File -> Cocoa Touch Class
Class: MYFriendCollectionViewCell
Subclass of: UICollectionViewCell
Also Create XIB: Tick
Language: Objective C
Look at MYFriendCollectionViewCell.xib and make your label inside here... connect the labels to an IBOutlet... don't use tags...
#property (weak, nonatomic) IBOutlet UILabel *nameLabel;
https://www.youtube.com/watch?v=GusRijNLUGg <- connecting IBOutlets
Add the line below in your ViewController
[self.collectionView registerNib:[UINib nibWithNibName:#"MYFriendCollectionViewCell" bundle:nil] forCellWithReuseIdentifier: CellIdentifier];
Change your cellForItem to:
static NSString *CellIdentifier = #"friendCell";
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath{
MYFriendCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier: CellIdentifier forIndexPath: indexPath];
cell.nameLabel.font = nameLabel.font = [UIFont fontWithName:#"Ubuntu" size:12.0]; // This ideally would be in MYFriendCollectionViewCell.m
cell.nameLabel.text = [[self.miListaAmigos objectAtIndex:indexPath.row] valueForKey:#"usr_username"];
return cell;
}

How to insert images in uicollectionview programmatically?

I'm pretty new to Objective-C so hopefully this all makes sense..I ran code provided in first answer Creating a UICollectionView programmatically..It is working fine .Now i want to add some pictures in cell that can expanded by mouse click .I searched many tutorial but all using nib files or storyboard files .How i can accomplish this task programmatically ?
Any help would be greatly appreciated. Thanks in advance.
as Logan suggest:
#define IMG_TAG 1000
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"MyCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
// Configure the cell...
cell.textLabel.text = #"test.....";
UIImage * img = [UIImage imageNamed: #"sampleImage"];
UIImageView * customImageView = (UIImageView*) [cell viewWithTag: IMG_TAG];
// two cases:
// 1) we got a "recycled" cell, so we already have an image view added
// 2) we got a "new" cell, so we must create, add image view AND TAg
// in both cases we will set image
if (customImageView){
// case 1
// nothing special
}else{
// case 2:
// add and tag:
customImageView = [[UIImageView alloc]initWithFrame:CGRectMake(100, 2, 30, 30)];
[cell addSubview: customImageView];
customImageView.tag = IMG_TAG;
}
customImageView.image = img;
return cell;
}
pls review and upvote :)
Beginner read tutroial and understand first everyting in below link and apple doc
ios-programming-uicollectionview-tutorial-with-sample-code
https://developer.apple.com/library/ios/documentation/UIKit/Reference/UICollectionView_class/Reference/Reference.html
change this your blackground color like this approach
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:#"cellIdentifier" forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame.png"]];
[self.view addSubview:recipeImageView];
cell.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]]];
return cell;
}
output:
NOTE:
code above is WRONG!
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell *cell=[collectionView dequeueReusableCellWithReuseIdentifier:#"cellIdentifier" forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame.png"]];
[self.view addSubview:recipeImageView];
cell.backgroundColor=[UIColor colorWithPatternImage:[UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]]];
return cell;
}
You allocate (better to allocate ONCE unsung TAGs...) but the code will ADD subview EVERY time cellForItemAtIndexPath is called.

Create a gallery using UICollectionView iOS

I wanna create a gallery using uicollectionview above tab bar controller. the problem that i have is i’m getting a SIGABRT crash when i’m connecting uicollectionview datasource. but when i didnt connecting it, the controller view did not show any image. did somebody know what to do?
this is the code I've made :
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
NSLog(#"stiker : %d", stickers1.count);
return stickers1.count;
}
// The cell that is returned must be retrieved from a call to -dequeueReusableCellWithReuseIdentifier:forIndexPath:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
NSLog(#"indexpath row : %d", indexPath.row);
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[stickers1 objectAtIndex:indexPath.row]];
// cell.backgroundView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"photo-frame.png"]];
return cell;
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
NSLog(#"numberOfSectionsInCollectionView coll : %d, stic : %d", collectionView.numberOfSections, stickers1Collection.numberOfSections);
return collectionView.numberOfSections;
}
I've connected the uicollectionview datasource in xib
Set number of items
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
set content
Just add UIImageView and UIlabel and set there tags in storyboard assign data in cellForItemAtIndexPath method
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *ImageView = (UIImageView *)[cell viewWithTag:100];
ImageView.image = [UIImage imageNamed:[[arrCategoryValue objectAtIndex:indexPath.row] objectForKey:#"image"]];
UILabel *lbl = (UILabel *)[cell viewWithTag:200];
lbl.text = [[arrCategoryValue objectAtIndex:indexPath.row] objectForKey:#"name"];
cell.tag = indexPath.row;
return cell;
}
for more info you can go here

Cells are hidden using CollectionView

I have a Navigation Controller pushing to a Collection View Controller. This collectionView has an NSArray of images, and I'm sure there are some elements in the collectionView using the method visibleCells.
But when I launch it there is no displaying cells.
Here is my code :
- (void)viewDidLoad
{
[super viewDidLoad];
images = [NSArray arrayWithObjects:#"angry_birds_cake.jpg", #"creme_brelee.jpg", #"egg_benedict.jpg", #"full_breakfast.jpg", #"green_tea.jpg", #"ham_and_cheese_panini.jpg", #"ham_and_egg_sandwich.jpg", #"hamburger.jpg", #"instant_noodle_with_egg.jpg", #"japanese_noodle_with_pork.jpg", #"mushroom_risotto.jpg", #"noodle_with_bbq_pork.jpg", #"starbucks_coffee.jpg", #"thai_shrimp_cake.jpg", #"vegetable_curry.jpg", #"white_chocolate_donut.jpg", nil];
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return images.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
UICollectionViewCell *cell;
[collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:#"Cell"];
cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
NSArray *tab = [collectionView visibleCells];
for (int i = 0; i < [tab count]; ++i)
{
NSLog(#"%d", i);
}
[collectionView setBackgroundColor:[UIColor blueColor]];
UIImageView *imageView = (UIImageView *)[cell viewWithTag:100];
imageView.image = [UIImage imageNamed:[images objectAtIndex:indexPath.row]];
return cell;
}
Where am I wrong ? Thanks a lot.

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