I'm just starting to use the UICollectionView so bear with me!
How do I load a nib into the cell?
It seems I have to register the nib and class to be used, but this does not work.
Code:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
[collectionView registerClass:[CluelessSymbolCell class] forCellWithReuseIdentifier:#"Symbol cell"];
[collectionView registerNib:[UINib nibWithNibName:#"CluelessSymbolCell" bundle:[NSBundle mainBundle]] forCellWithReuseIdentifier:#"Symbol cell"];
CluelessSymbolCell *cell = (CluelessSymbolCell *)[collectionView dequeueReusableCellWithReuseIdentifier:#"Symbol cell" forIndexPath:indexPath];
CluelessClue *clue = [clueManager clueForIndexPath:indexPath];
[cell.backgroundImageView setImage:[UIImage imageNamed:[clue.imageNames objectAtIndex:0]]];
return cell;
}
It turns out my nib file had the default view controller in it (which was hidden) as well as my custom cell - doh!
Related
I have a UIViewController with a UICollectionView on it but Xcode doesn't seem to look like every tutorial I find on the Internet or on YouTube - When I drag a UICollectionViewCell to place in the UICollectionView, it won't let me place it.
Now I'm confused as to how I can link my cell to the UICollectionView.
This is the viewController.h file:
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{
return 1;
}
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
return [self.imagesArray count];
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
ImageViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"imageCell" forIndexPath:indexPath];
NSString *myImageString = [self.imagesArray objectAtIndex:indexPath.row];
cell.imageView.image = [UIImage imageNamed:myImageString];
return cell;
}
-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
return CGSizeMake(100.0, 100.0);
}
-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
return UIEdgeInsetsMake(5, 5, 5, 5);
}
- (void)viewDidLoad
{
[super viewDidLoad];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
//[self.collectionView registerClass:[ImageViewCell class] forCellWithReuseIdentifier:#"imageCell"];
self.imagesArray = #[#"shirt1.PNG", #"pants.png", #"pants2.png"];
}
I'm not using a Storyboard interface but individual xib's. When I run this all that appears is the blank black screen. What am I missing?
-registerNib:forCellWithReuseIdentifier:
If you have your cell defined in a NIB, then you register that NIB with the collection view. That is how the collection view know what to load when -dequeueReusableCellWithReuseIdentifier:forIndexPath: is called.
- (void)viewDidLoad
{
// …
UINib nib = [UINib nibWithNibName:#"<the name of your xib>" bundle:nil];
[self.collectionView registerNib:nib forCellWithReuseIdentifier:#"imageCell"];
// …
}
Because you didn't have new a object of UICollectionViewCell in this method:
-(UICollectionViewCell*)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
The "cell" in your method must be set to nil.
The settings for the UICollectionView were defined using IB (ie scroll direction: horizontal, etc), and was embedded in UITableViewCell using IB.
UICollectionViewCell displays, images display, however, images are stacked on top of one another, instead of one image per one cell with fidelity.
I made individual UIImageView for each picture as instance variables, and same occurred using if and switch statements in the cellForItemAtIndexPath message.
Since IB was used, it may be a stretch to identify the bug, however, would you please help to identify the bug in case it is obvious from the code? Thanks.
#implementation AccountTableViewCell
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
// Configure the view for the selected state
imageArray = #[[UIImage imageNamed:#"image1.png"], [UIImage imageNamed:#"image2.png"], [UIImage imageNamed:#"image3.png"], [UIImage imageNamed:#"image4.png"], [UIImage imageNamed:#"image5.png"]];
self.oCollectionView.dataSource = self;
[self.oCollectionView setFrame:self.contentView.frame];
[self.contentView addSubview:self.oCollectionView];
self.oCollectionView.backgroundColor = [UIColor clearColor];
[self.oCollectionView reloadData];
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return imageArray.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
UICollectionViewCell* cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"accountCell" forIndexPath:indexPath];
UIImageView* iv = [[UIImageView alloc] init];
[cell.contentView addSubview:iv];
[iv setFrame:cell.contentView.frame];
iv.image = imageArray[indexPath.row];
return cell;
}
#end
It's because you keep on adding an UIImageView to the cell each time it's dequeued.
Instead, you should subclass the UICollectionViewCell (let's call it "MYCollectionViewCell", add a UIImageView to the cell subclass in the storyboard and set the UIImageView as an outlet on the subclass.
Then, within cellForItemAtIndexPath, set that imageView's image like so:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
MyCollectionViewCell* cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"accountCell" forIndexPath:indexPath];
cell.imageView.image = imageArray[indexPath.row];
return cell;
}
In my main view controller, I have a UICollectionView (created by using the IB). And:
-(void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath: (NSIndexPath *)indexPath
{
NSLog(#"Cell clicked....%d",[indexPath row]);
}
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
ChildView *calendar = [[ChildView alloc] initWithDate:newDate];
calendar.delegate = self;
[cell.contentView addSubview:calendar];
return cell;
}
If I touch outside the bounds of the child view, I get the event. If I touch inside the cell, where the child view is, no event is trapped in didSelectCellAtRowIndex.
Why?
The collection view handles its touches internally, so any touch handlers or gesture recognizers on your views will take precedence.
I am new in iphone. I have a collection view in my app and it work fine but now I want to select an image and that image I want in next viewcontroller in another imageview. - (NSInteger)collectionView:
I use the following code:
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return recipeImages.count;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *identifier = #"Cell";
UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath];
UIImageView *recipeImageView = (UIImageView *)[cell viewWithTag:100];
recipeImageView.image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.row]];
return cell;
}
Implement collectionView:didSelectItemAtIndexPath::
- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath
{
UIImage *image = [UIImage imageNamed:[recipeImages objectAtIndex:indexPath.item]];
// go on...
}
I implemented a Collection View programatically in a ViewController and I connected it with the Storyboard but the scrolling is not working and half of the cells do not appear since they are faded to the right:
- (void)viewDidLoad {
[super viewDidLoad];
[self.collectionView registerClass:[FotoCell class]
forCellWithReuseIdentifier:#"cell"];
UICollectionViewFlowLayout *myLayout = [[[UICollectionViewFlowLayout alloc]init]autorelease];
[myLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];
[self.collectionView setCollectionViewLayout:myLayout];
}
Do you know why?
You need to remove the registerClass line in viewDidLoad and set the reuse identifier in the Datasource method for UICollectionViewDelegate as follows -
- (UICollectionViewCell *)collectionView:(UICollectionView *)cv cellForItemAtIndexPath: (NSIndexPath *)indexPath
{
FotoCell *cell = [cv dequeueReusableCellWithReuseIdentifier:#"cell" forIndexPath:indexPath];
....
return cell;
}