All,
I am adding a UICollectionView to a UIView but it's failing to load cells because it seems that this:
[self.buttonsCollectionView registerNib:[UINib nibWithNibName:#"AccountMenuCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"AccountMenuCell"];
Is getting loaded after it hits the delegates for the UICollectionView. Normally this would be placed in viewDidLoad but is not available in a UIView.
- (AccountMenuCollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
AccountMenuCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"AccountMenuCell" forIndexPath:indexPath];
[cell.accountMenuButton setTitle:#"Deposit" forState:UIControlStateNormal];
return cell;
}
Any guidance?
EDIT:
So I am using a view from the storyboard initially and then adding a subview which is Account Menu. Within this view I have a Collection View.
Try to use with the default method and instantiate your Cell inside of the cellForItem...
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
AccountMenuCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"AccountMenuCell" forIndexPath:indexPath];
[cell.accountMenuButton setTitle:#"Deposit" forState:UIControlStateNormal];
return cell;
}
and .. verify with Breakpoints if your code is running..
Related
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 have a tableview, in this tableview i have four rows, in each row i added a collection view programatically and i check that if its my first row i should register 1st nib of collection view cell, if its my 2nd row, i should register 2nd nib of collection view cell and so on and than i simply reloads the collection view. I used the below code:-
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:#"cellID"];
if(cell==nil){
cell=[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cellID"];
cell.selectionStyle=UITableViewCellSelectionStyleNone;
}
[cell.contentView.subviews makeObjectsPerformSelector:#selector(removeFromSuperview)];
UICollectionView *collectionView=[[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, cell.frame.size.width, cell.frame.size.height)];
collectionView.dataSource=self;
collectionView.delegate=self;
if (indexPath.row==0) {
[collectionView registerNib:[UINib nibWithNibName:#"QuotesCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"quotes"];
} else if (indexPath.row==1){
[collectionView registerNib:[UINib nibWithNibName:#"AlphabeticalWiseCategoriresCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"alphabets"];
} else if (indexPath.row==2){
[collectionView registerNib:[UINib nibWithNibName:#"DaysCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"days"];
}else if(indexPath.row==3){
[collectionView registerNib:[UINib nibWithNibName:#"LifeAspectsCollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"life"];
}
[collectionView reloadData];
return cell;
}
My problem/question is how could i come to know with which collection view nib i have to deal with in following delegates, because here i have to specify the same reuse identifier that i have used while registering nib with collection view ?
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
}
My Second problem is how could i detect which tableview row's collection view cell's is clicked since i have different collection view?
Firstly, why do you not use static table view? If you hardcode every cell, I think it will be good enhancement.
Next about your problem, iOS provides every UIView tag property.
If you remake your table to static table, then you will can set tag property via InterfaceBuilder. If not:
UICollectionView *collectionView=[[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, cell.frame.size.width, cell.frame.size.height)];
collectionView.dataSource=self;
collectionView.delegate=self;
collectionView.tag = indexPath.row;
Then:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
switch collectionView.tag {
case 0:
...
break
case 1:
...
break
}
}
And your can use this approach to resolve your second problem
You could keep the collectionView you created each time, say, in an array. So the index of each collectionView in the array will be equal to the indexPath.row. By retrieve the index of the collectionView parameter in - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath, you could know which collectionView you are dealing with, as well as the UICollectionViewCell.
I'm missing something obvious here as this isn't a difficult task.
I have my Collection view in storyboard (amongst other views), with the prototype cell's reuse id being "Cell", and a UILabel in that cell, with a tag of 100.The code (boilerplate):
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return 4;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];
UILabel *label = (UILabel *)[cell viewWithTag:100];
label.text = #"Hello";
return cell;
}
The code is within a UICollectionViewController, as it should.
When i run, the view appears yet no cells or text are visible.
A NSLog in the cellForItemAtIndexPath confirms that it is called, 4 times.
I've even changed the prototype cell's background color which shows that not even the cell's are appearing.
In the viewDidLoad, it calls: [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];
What am i missing?
Use like this:
Instead of registerClass: use registerNib:
static NSString *identifier = #"Cell";
if ([[UIDevice currentDevice] userInterfaceIdiom]==UIUserInterfaceIdiomPhone) {
[self.collection registerNib:[UINib nibWithNibName:#"CollectionPhotoItem" bundle:nil] forCellWithReuseIdentifier:identifier];
}
else{
[self.collection registerNib:[UINib nibWithNibName:#"CollectionPhotoItem_ipad" bundle:nil] forCellWithReuseIdentifier:identifier];
}
make sure you are under any-any ratio in your storyboard
if you are working with any other configuration and you tried to use the simulation it might not show up
for example if you use regular width and compact hight and then tried to use the simulator in your Xcode all your work will not show up !
UICollectionView refreshes data after scrolling and changes the position of the cells. How can I stop it? I don't want to call cellForItemAtIndexPath on every scrolling?
I don't have too much data.
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath:(NSIndexPath *)indexPath {
CCell *cell = [cv dequeueReusableCellWithReuseIdentifier:#"cell" forIndexPath:indexPath];
cell.logo.image=[UIImage imageNamed:[NSString stringWithFormat:#"%#.jpg",news[indexPath.row]]];
return cell;
}
I have a collection view in my app, I want it to contain a custom cells. I've created a custom cell view xib file. Then I use it in my data source method :
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
OtherCustomersCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:OTHER_CUSTOMERS_CELL_IDENTIFIER forIndexPath:indexPath];
if(cell == nil){
NSArray *nsObjects = [[NSBundle mainBundle] loadNibNamed:#"OtherCustomersCell" owner:nil options:nil];
for(id obj in nsObjects)
if([obj isKindOfClass:[OtherCustomersCell class]])
cell = (OtherCustomersCell*) obj;
}
[cell.name setText:#"AAAA BBBBB"];
return cell;
}
But when I run the app, there is just a black rectangular where the collection view should be (at the bottom under the table view):
What am I doing wrong?
Thank you in advance.
Collection views work differently than table views in that you don't have to create a cell if one can't be dequeued.
Instead, you have to register the nib for the cell first:
- (void)viewDidLoad
{
...
UINib *cellNib = [UINib nibWithNibName:#"OtherCustomersCell" bundle:nil];
[collectionView registerNib:cellNib forCellWithReuseIdentifier:OTHER_CUSTOMERS_CELL_IDENTIFIER];
}
You can then dequeue the cell and it will be created automatically for you if necessary:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
OtherCustomersCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:OTHER_CUSTOMERS_CELL_IDENTIFIER forIndexPath:indexPath]; // cell won't be nil, it's created for you if necessary!
[cell.name setText:#"AAAA BBBBB"];
return cell;
}
You have to register UICollectionView instance in the following way in viewdidload then you can use this.
[self.photoListView registerNib:[UINib nibWithNibName:#"UIcollectionViewCell" bundle:nil] forCellWithReuseIdentifier:#"Identifier"];