I am getting an unwanted cell at the top of my UITableView. When I configure the cell, for testing purposes, I do the following:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Configure the cell...
if (indexPath.row == 0)
{
cell.textLabel.text = #"LOL";
}
else {cell.textLabel.text = #"Hello";}
return cell;
}
I have it set to return 1 cell in 1 section. As far as cells that are coming back, I am only seeing the one that says "LOL", but there is what looks like a blank cell above.
Image attached:
EDIT: I fixed it by deleting the entire table view and dragging a new one in.
In those kind of cases, I would mark the cells, for example, set the background colour of the cells to green, so it become obvious whether there is really an extra cell there, or some other sort of blank.
Related
I am trying to create a UITableView from code (never done it this way before) which will be displayed in a UIPopover. I want to list the contents (filenames only) of a directory. This is my code:
- (UITableViewCell *)tableView:(UITableView *)theTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *cellIdentifier = #"FilenameCell";
UITableViewCell *cell = (UITableViewCell *)[theTableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
cell.textLabel = fileList[0];
return cell;
}
It's obviously not working, I'm getting an error: "Assignment to readonly property". So, the question is: How do I set the cell's data in this case?
You need to set your textLabel's text property (which I'm sure was just a typo in your case):
cell.textLabel.text = fileList[0];
Here's where the magic isn't happening:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"songCell";
songViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
long row = indexPath.row;
if (cell == nil) {
cell = [[songViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
if (tableView == self.searchDisplayController.searchResultsTableView) {
cell.songLabel.text = _searchResults[row];
} else {
cell.songLabel.text = _songListArray[row];
}
return cell;
}
I know the _searchResults array is populated with the correct search results and I've edited the numberOfRowsPerSection appropriately. The filter is working correctly, but it won't display the _searchResults[row] text while typing into the search bar. If I don't use the bar, the cells are populated correctly with _songListArray[row].
Something is going wrong in:
if (cell == nil) {
cell = [[songViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
If I don't include the if expression, I get an error. How should I initialize the prototype cell while the search bar is in use? All I get is empty labels, but I know the search is working because if there are no filtered results in the array the table says "No Results" in the middle. Why isn't my songLabel.text updating?? It won't even display text when I set the label to #"HELLO??" instead of the array[row].
You need to have the searchResultsTableView dequeue a cell, not just your main table view. The cellForRowAtIndexPath method should look something like this:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
if (tableView == self.tableView) {
RDTriangleCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.textLabel.text = self.theData[indexPath.row];
return cell;
}else{
UITableViewCell *cell = [self.searchDisplayController.searchResultsTableView dequeueReusableCellWithIdentifier:#"SearchCell" forIndexPath:indexPath];
//RDCell *cell = [self.searchDisplayController.searchResultsTableView dequeueReusableCellWithIdentifier:#"SearchCell" forIndexPath:indexPath];
cell.textLabel.text = self.filteredData[indexPath.row];
return cell;
}
}
In viewDidLoad, you should register the class if you use the code I show above for a standard UITableViewCell.
[self.searchDisplayController.searchResultsTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"SearchCell"];
If you use a custom cell for the search results table, then you should use something like the line I have commented out, and register the nib for that custom cell.
I'm trying to add a data source inside a UITableView. I tried the following, but unfortunately it didn't work:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 8;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Set the data for this cell:
cell.textLabel.text = [_classCellview objectAtIndex:indexPath.row];
cell.detailTextLabel.text = #"One";
cell.detailTextLabel.text = #"Two";
// set the accessory view:
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
cell.textLabel.text = [_classCellview objectAtIndex:indexPath.row];
You're telling the table that there are 8 sections, but you're not taking the section from the index path into account when you populate the cell. An index path has (in the case of a table view) two values: a section and a row. You need them both to know what cell you're dealing with. So, you're probably getting the same content repeated in each section of your table. (It'd help if you told us exactly what the problem is, though.)
I need to display each webview in each of the tableviewcell in my Uitableview.When using the below code,when there are 2 elements,the first cell is empty but second cell is correct.hrs and hrsHtml contains all values,the problem is only the last data is displaying in their appropriate cell in tableview.Other cells are just blank.Also is total cells is 2,first we can only been able to see the 2nd cell only,but after scrolling tableview reloads and 2nd cell disappears and 1st cell gets displayed.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [brId count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
if (cell == nil) {
cell = [[ UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
[cell.contentView addSubview:hrs];
hrsHtml = [NSString stringWithFormat:#" <font size=\"2\" face=\"Arial\">%# </font>",[html objectAtIndex:indexPath.row]];
[hrs loadHTMLString:hrsHtml baseURL:nil];
return cell;
}
Screenshot when tableview appears,Only webview in cell 2
Screenshot when tableview scrolls,Only webview in cell 1,cell 2 disappears
Since hrs and hrsHtml are single objects, you only have one of each even though you have multiple cells. If you modify hrs, it will change for all cells since they seem to be sharing it. (Unless you have other code somewhere that changes the objects that those variables point to.)
Another odd thing is that you use a brId array to determine the number of rows and a html array to get the row content. If those ever get out of synchronization, you will have problems.
Also, you should only add a subview to a cell when you create a new one.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil] ;
}
hrs = [[UIWebView alloc] initWithFrame:CGRectMake(10,0,320,84)];
hrs.userInteractionEnabled = YES;
hrs.backgroundColor = [UIColor clearColor];
hrsHtml = [NSString stringWithFormat:#" <font size=\"2\" face=\"Arial\">%# </font>",[html objectAtIndex:indexPath.row]];
[hrs loadHTMLString:hrsHtml baseURL:nil];
[cell.contentView addSubview:hrs];
hrsHtml = nil;
return cell;
}
Now the webview loads correctly in every tableviewcell.
i think you have problem in initializing cell try below code
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil] autorelease];
}
How do I create an item in my datasource using a cell that is UITableViewCellStyleValue1? Do I have to create my own custom cell to do it? I don't see anything in the sample catalog.
thank,
howie
A new table item cell was added that emulates the table settings cell style. see https://github.com/facebook/three20/pull/682
You can either merge it manually or wait for the next three20 release which will hopefully include this change.
The point of using UITableViewCellStyleValue1 is that your using a pre-defined layout, so no you don't use a custom layout.
Example:
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell.
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
cell.textLabel.text = #"SettingLabel";
cell.detailTextLabel.text = #"SettingValue";
return cell;
}