- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
return getName.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:[getName objectAtIndex:indexPath.row]];
return cell;
}
When I run the app then it doesn't show anything.what are the reasons behinds that
Mostly its tag issue cause as per your crash log
[UICollectionViewCell setImage:] means image is directly set to UICollectionViewCell not recipeImageView. so you have to check proper tag value..
so ones check tag value of image view..
otherwise check that you have register your collection view cell.
Related
I have a problem in my storyboard.It is working fine but when i try to change the content property of UITableView it caused following error
Assertion failure in -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:], /SourceCache/UIKit/UIKit-2903.23/UITableView.m
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'unable to dequeue a cell with identifier Cell - must register a nib or a class for the identifier or connect a prototype cell in a storyboard'
I want to design a grouped tableview with static cell.Thanks in advance
Code
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
return cell;
}
if you use static cell, just comment all the UITableViewDatasourceDelegate method. so comment the following code:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 2;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 3;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
return cell;
}
Wish this will help you!
Instead of using:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//-> This is used when using prototype cells (e.g) Dynamic TableView
Use:
UITableViewCell *cell = [super tableView:tableView
cellForRowAtIndexPath:indexPath];
//-> Since you chose Static TableCells you don't need to reuse instead use the cells you created in nib
I have encountered same issue, and I think I found the way to work this out.
Create a Controller extends from UITableViewController to wrap its controller, it will have default UITableViewDelegate and UITableViewDataSource methods.
Remove UITableView delegate and datasource
Delete default UITableViewDelegate and UITableViewDataSource methods from your controller file, coz it's static cells, so if these exist, will not appear
Hope it helps.
When using storyboard the tableview cell must be registered in the storyboard.That means cell must be added to the table and its identifier must be set.This identifier should be used in the code in cellForRowAtIndexpath
EDIT
In case of static cells the each purticular cells needed to be created in the nib and filled content via code or nib
Read this
Loading Table View Cells from a Storyboard
Excellent starter
You are not allowed to use static cells in a normal UITableView.
Instead you need to use UITableViewController to go with the static cells.
this and this may or might help.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [YourArr count];
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 44;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = [NSString stringWithFormat:#"cell %d",indexPath.row];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell = nil;
if (cell == nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
return cell;
}
Add this code in cellForRowAtIndexPath
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
}
else
{
UIView *subview;
while ((subview= [[[cell contentView]subviews]lastObject])!=nil)
[subview removeFromSuperview];
}
I have a UICollectionView where I display a grid of images downloaded from the Internet. I am using SDWebImage to load the images. The problem I am facing is that, when I scroll through the UICollectionView, sometimes the cells repeat themselves, displaying the same image. But when the cell is scroll out of view and then brought back, it has the right image set.
-(UICollectionViewCell*) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
NSString *CellIdentifier = #"Gallery_Cell";
GalleryCell *cell;
if (cell==nil) {
cell= (GalleryCell *)[self.flowCollection dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
ImageItem *dets = [self.imageList objectAtIndex:indexPath.row];
NSURL *mainImageURL = [NSURL URLWithString:dets.smallImageURL];
cell.image.contentMode = UIViewContentModeScaleAspectFill;
cell.image.clipsToBounds = YES;
[cell.image setImageWithURL:mainImageURL placeholderImage:nil];
}
return cell;
}
Has this happened to anyone else? Would highly appreciate any pointers.
On GalleryCell.m you need to add prepareForReuse method and there nullify the _image variable (assuming that you have a image #property in the cell):
- (void)prepareForReuse {
[super prepareForReuse];
[self setHighlighted:NO];
_image = nil;
}
The following is stated in the "UICollectionView Class Reference":"
If you registered a class for the specified identifier and a new cell must be created, this method initializes the cell by calling its initWithFrame: method. For nib-based cells, this method loads the cell object from the provided nib file. If an existing cell was available for reuse, this method calls the cell’s prepareForReuse method instead."
Do you have a prepareForReuse method for your GalleryCell cell class?
you cell class should be a subclass of UICollectionReusableView Class. And check it.
I ended up using “didEndDisplayingCell” method of UICollectionView and ending the current Image download and setting the image to nil. This worked perfectly and there was no more “shuffling” or repetition of images! :)
use this method this vl definitely work 100%.
- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath;
{
GalleryCell *cell1 = (GalleryCell*)[_resumeCollectionView cellForItemAtIndexPath:indexPath];
cell1= nil;
}
-(UICollectionViewCell*) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
NSString *CellIdentifier = #"Gallery_Cell";
GalleryCell *cell;
if (cell==nil) {
cell= (GalleryCell *)[self.flowCollection dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];
ImageItem *dets = [self.imageList objectAtIndex:indexPath.row];
NSURL *mainImageURL = [NSURL URLWithString:dets.smallImageURL];
[cell.image setImage:[UIImage new]];
cell.image.contentMode = UIViewContentModeScaleAspectFill;
cell.image.clipsToBounds = YES;
[cell.image setImageWithURL:mainImageURL placeholderImage:nil];
}
return cell;
}
Since the cells are being reused, you must set their contents unconditionally in cellForIndexPath:. Your code as it is sets the images eventually, but it leaves the chance for the images to be temporarily left as old values -- values set before they were reused.
A quick solution is (probably) to provide that setImageWithURL call with a placeholder image. I don't know the SDImage library, but it's a good guess that it immediately sets an imageView's image to the placeholder image if one is provided.
If you don't have or don't want a placeholder image, you can implement prepareForReuse in your UICollectionViewCell subclass and clear the imageView there.
I have a custom/sub-classed UITableViewCell using NSLayoutConstraints. The left most UIImageView may or may not be populated with an image, and if not, the objects to right of this field will naturally shift to the left. Works well within the custom UITableViewCell, however I'll be populating the content with my custom UITableViewController. Unfortunately, following code will populate every row cell.dispatchedView with an image -- though I've trapped to not populate rows with anything.
This has something to do with the dequeueReusableCellWithIdentifier. Ideas?
static NSString *CellIdentifier = #"CellIdentifier";
- (void)viewDidLoad {
[super viewDidLoad];
[self.tableView registerClass:[NXGActiveUnitsCell class] forCellReuseIdentifier:CellIdentifier];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath {
NSDictionary *item = [self.model.dataSource objectAtIndex:indexPath.row];
NXGActiveUnitsCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if([[[item objectForKey:#"cfs_no"] clean] length] > 0) {
cell.dispatchedView.image = [UIImage imageNamed:#"p.png"];
NSLog(#">>>%#",[item objectForKey:#"cfs_no"] );
} else {
NSLog(#">>> i got nothing so I should not touch this row...");
}
cell.departmentIconView.image = [UIImage imageNamed:#"f.png"];
cell.unitLabel.text = [item valueForKey:#"unit_id"];
return cell;
}
I don't know if this already solves your problem, but you should
definitely set
cell.dispatchedView.image = nil;
in the else-case, because cells are reused.
I have a UICollectionView that is displaying many UICollectionViewCells that I have subclassed as CardCell. I pass the variable "type" to the CardCell in - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath I want the CardCell class to be able to load a different Nib file depending on what type is passed in. The different types need to have different layouts.
The problem is I cannot figure out where to change this in my CardCell.m. I tried using - (void)prepareForReuse but that does not call unless the user is scrolling.
You should register each nib file you need in viewDidLoad, something like this (substituting the correct names for the nib file and the identifier):
[self.collectionView registerNib:[UINib nibWithNibName:#"RDCell" bundle:nil] forCellWithReuseIdentifier:#"FirstType"];
Then, in itemForRowAtIndexPath, test for type and return the correct type of cell:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
if (type = #"firstType") {
FirstCell *cell = (FirstCell *) [collectionView dequeueReusableCellWithReuseIdentifier:#"FirstType" forIndexPath:indexPath];
return cell;
}else{
SecondCell *cell = (SecondCell *) [collectionView dequeueReusableCellWithReuseIdentifier:#"SecondType" forIndexPath:indexPath];
cell.whatever .....
return cell;
}
}
I am having trouble in converting a uitable into collectionview.
I have the following code but it has error on "collectionView dequeueReusableCellWithIdentifier"May I know what;s the problem?
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
// Return the number of rows in the section (the amount of items in our array)
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return [pictureListData count];
}
// Create / reuse a table cell and configure it for display
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Cell";
UICollectionViewController *cell = [collectionView dequeueReusableCellWithIdentifier:CellIdentifier];
// Get the core data object we need to use to populate this table cell
Pictures *currentCell = [pictureListData objectAtIndex:indexPath.row];
You have the wrong method name. For UICollectionViews the method is:
- (id)dequeueReusableCellWithReuseIdentifier:(NSString *)identifier forIndexPath:(NSIndexPath*)indexPath
So you need to change
UICollectionViewController *cell = [collectionView dequeueReusableCellWithIdentifier:CellIdentifier];
to
UICollectionViewController *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];