I'm trying to set a Table View Cell that has been grouped, as a button however I can't seem to find where to do it in the interface builder in XCode 4.2 or programmatically.
I've tried linking the table view cell to an IBAction, however it only lets me create or link to an IBOutlet.
As a temporary fix I have embedded a rectangle button in the cell, but this doesn't highlight blue when pressed.
I've seen this work in several apps, an example is the Clear History and Clear Cookies and Data buttons in the Safari app below:
Imagine that your IBAction is like this:
-(IBAction)buttonPressed{
//Do my stuff
}
Then, you should do this in your delegate:
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
//check if your cell is pressed
BOOL myCellIsPressed = ...
if(myCellIsPressed)
[self buttonPressed];
}
To check if your cell was pressed, you have several ways, for example, if you know the row of your button in the table:
int myCellRow = 5;
if (myCellRow == IndexPath.row) //YES!
Or you can put a tag in your cell and then check if is that one:
#define myTag 5
When creating the cell:
UITableViewCell *myCell = ...
myCell.tag = myTag
And in didSelectRowAtIndexPath:
UITableViewCell *selectedCell = [tableView cellForRowAtIndexPath:indexPath];
if (selectedCell.tag == myTag) //YES!
these aren't buttons..
The function of clear cookies and other things are processed in
table view delegate method
tableview : didselectRow
There you can find which section and which row is selected and perform functions based on that.
Related
I know about UITableView reusable header and footer view
but in my case, i have UITableView Cells, which i need to place also in section headers and also in normal rows
if i use
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
MyCell * cell = [tableView dequeueReusableCellWithIdentifier:#"MyCell"];
// ...
return cell;
}
How does it work out with the reusing? (is the message to be available for reuse even than passed), or does this disable the cell reuse
The cells get dealloc'ed when they go off-screen. So they don't get reused. An easy way to verify this is to subclass UITableViewCell with the following
- (void)dealloc
{
NSLog(#"I got dealloc'ed");
}
and observe the console output as you scroll.
These has always worked fine. You first should create a prototype with that name, or register a custom nib with your custom section identifier. HOWEVER , I noticed this breaks in iOS 7 when you add new sections to the table dynamically. Reverting to a plain non-reusing UIView works. Really a shame!
The Situation
I'd like to be able to get information about the title of a cell within a UITableView when the user swipes the cell (to display the "delete" button).
The Code
When the user swipes a cell in the UITableView, this method is fired:
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath*)indexPath
The Problem
I need to be able to get the name of the cell the user "swiped" so that my iOS (Obj-C) app can do various operations, etc.
Everything Else
I know that the indexPath has something, but I can't get an NSString from it (which is what I need).
I was also thinking that a workaround such as using a gesture recognizer instead of the above method might be able to provide me with more information about the cell.
Any ideas as to how I can get the name of the cell when the user "swipes to edit / delete"?
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
NSString *text = cell.textLabel.text;
// do something with text
}
Please, how does your table work in the first place - you don't seem to understand the basic principles of it. You back your table up with a data model. YOU provide and construct the cells for each indexPath, so you should know how to access the data in your model using that swiped indexPath, no?
Of course you could also ask the tableView delegate (yourself) for the swiped cell by calling tableView:cellForRowAtIndexPath: and then check the labels on that cell.
Have a look at the implementation of your tabkeView:cellForRowAtIndexPath: method all your info of how to get the data should be there...
All in all it's pretty easy, if you provide some code you sure will get more hints.
I have my own table view cell which is defined in my storyboard. I have also defined a custom UITableViewCell class for this special cell. So when I want to create an Outlet for my custom prototype cell I get an error that the Outlet cant be created.
Since this is not possible I have to do some ugly workarounds and use the tags in IB to reference the individual labels and buttons later on in my code.
I don't really see why this is not possible and I wonder if working with tags and [myCell viewWithTag:] is the best possible way to go here?
Because the outlet is a one-to-one connection between your controller and a specific item within the view. In the case of a prototype cell, it is simply a description of a cell that can have an arbitrary number of different items (i.e. rows in your table view). How would the controller know which item you are referring to (e.g. row 5 or 500)? That is why you are receiving the error message.
Lucas provided one method to refer to your connection via tags which works perfectly well.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellIdentInIB"];
UIImageView *img = (UIImageView*) [cell.contentView viewWithTag:1];
//img.image = ...
//Access you prototype cell here to alter its style, example:
[[cell layer] setCornerRadius:10];
[cell setClipsToBounds:YES];
return cell;}
I assume you are using dynamic prototypes - in the attribute inspector of the tableview in the storyboard there is an option to select "static cells" or "dynamic prototypes". You can do what you are trying to do if you select "static cells" as there is only one cell in your tableview at run time for each cell in the storyboard. Using this approach you will only be able to use the cells you create in storyboard i.e. you will not be able to select the number of cells in your code.
I am using storyboarding. I have an UITableView with one prototype cell. This cell is of style "subtitle". I have added a segue from the cell to the detailed view. So when the user taps a cell it will open the corresponding editor... That all works great.
Now I added a UISearchDisplayController an a UISearchBar, implemented the delegates. That works very well.
But in the search result table the cells are of style "default" and are not tapable. What do I have to do to get a result table looking and behaving like the "unsearched" table?
I would like to contribute for answer #1 this is what I did and it worked for me
in the method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
instead of assigning the cell from the parameter tableView
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
assign it directly from the TableView on the view so you have to replace this
// UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
with this
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:CellIdentifier];
Found the problem...
The method
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
pulled the cell from the tableView, which is in the result case not the tableView from the storyboard but the resultTableView from the SearchDisplayController.
I now get the cell to display in both cases from the table view in the storyboard and now it works.
I've been using ios 7.0 and Xcode 5.0. I found that search display controller is using the same tableview layout as the delegate view controller. All you have to do is judge if the current tableview is the delegate view controller's tableview, or the search display controller's tableview. But remember to add the sentence
tableView.rowHeight = self.tableView.rowHeight;
in the following code snippet:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
if (tableView == self.searchDisplayController.searchResultsTableView)
{
tableView.rowHeight = self.tableView.rowHeight;//very important!
return [self.searchResults count];
}
else
{
...
return ...;
}
}
if you forget to implement that sentence, then the row of the table view of search display is only as high as a default row, which makes you think it doesn't look like the "unsearched" table.
There is a possible answer to this here. It may not work entirely for you, but as I explained, the UISearchDisplayController creates the table view.
Check the documentation and you can get a better understanding of it, but it states:
You initialize a search display controller with a search bar and a
view controller responsible for managing the original content to be
searched. When the user starts a search, the search display controller
is responsible for superimposing the search interface over the
original view controller’s view and showing the search results. The
results are displayed in a table view that’s created by the search
display controller. In addition to the original view controller, there
are logically four other roles. These are typically all played by the
same object, often the original view controller itself.
In my case UISearchDisplayController was using right cell type (custom) but height of cell was wrong so I had to use
(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
method to fix it.
I really need help with filling in data in a Table View, where my Table View resides in a Navigation Bar, where the Navigation bar lies in a Tab Bar. After hours of trying add at least 5 data in my Navigation Bar, but it was never able to fill in my Navigation Bar. This was the code I've been using, which is supposed to be the right code: (this code is written before - (void)dealloc:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 5;
}
// 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] autorelease];
}
// Configure the cell.
cell.textLabel.text = #"Some value";
return cell;
}
In addition, I tried linked up the dataSource and delegate Outlets to the File Owners, but when I ran the app, when I clicked the Tab Bar Item where my table view is supposed to show my 5 data, it stopped and crashed my app. When I disconnected the dataSource and delegate from File Owners and ran the app again, the Table View is empty in the Navigation Bar with no data filled in, just empty blanks.
So I don't know what else is going wrong here, either I have to link the dataSource and delegate again, which will cause the app to crash again or someone thinks my code is incorrect or is there problems when I insert a Table View in a Navigation Bar and inserting Navigation Bar into a Tab Bar?
Anyone please help me, thanks
Make sure you set the identity of the File's Owner to be a subclass of UITableViewController that contains the code you posted above. You can view the identity by selecting File's Owner in the document window and using the Identity tab (4th tab) in the Inspector Panel.
in .h file declare UITableView *myTableView and
the property as #property(nonatomic , retain) IBOutlet UITableView *myTableView
finally synthesize the variable in .m file.
Now only build your project and go to IB. You will be able to see the IBOutlet in File Owner Attribute Inspector. Connect it to the table you dragged from Library and then connect the datasource and delegate to the owner. save and exit the Interface Builder.
Now Build and Run the project, ur should work fine
Hope this works!!