Hey all, I have a table where the user can select a preferred sound, but one should be already preselected.
I know the row number that should be preselected, however, I do not know the index number. How would I get that?
Cheers all, Merry Xmas.
The NSIndexPath class provides a handy method to provide the index for a given row and section: +indexPathForRow:inSection:
You could use it as follows:
- (void)selectRow:(NSUInteger)rowNum inTableView:(UITableView *)tableView
{
NSIndexPath * indexPath = [NSIndexPath indexPathForRow:rowNum
inSection:0];
[tableView selectRowAtIndexPath:indexPath
animated:YES
scrollPosition:UITableViewScrollPositionMiddle];
}
Related
I have a view based NSTable with ten or more rows and five columns. To populate data for this table, I have a dictionary of 5 arrays. So each dictionary object is for each column.
Now I need to get information when I click on any cell. I am using tableViewSelectionDidChange delegate to get notified on cell selection. Using this I can get only the [myTableView selectedRow] to get to know the row selected. How can I know which column was the row in. For ex: I select/click on 5th row in 3rd column. Now I need to know which column was it clicked on so that I can extract required object from the dictionary.
Any clues ?
You may override the mouseDown: event of your tableView and get the clicked column as:
- (void)mouseDown:(NSEvent *)theEvent
{
NSPoint globalLocation = [theEvent locationInWindow];
NSPoint localLocation = [self convertPoint:globalLocation fromView:nil];
NSInteger clickedCol = [self columnAtPoint:localLocation];
[super mouseDown:theEvent];
}
or you may use NSTableView delegate method:
tableView:didClickTableColumn:
For reference check:
https://developer.apple.com/library/mac/documentation/Cocoa/Reference/NSTableViewDelegate_Protocol/Reference/Reference.html#//apple_ref/occ/intfm/NSTableViewDelegate/tableView:didClickTableColumn:
I'm working with NSFetchedResultsController to fill one of my UITableViews with data grouped into sections. Now I want to add a new section atop all the fetched sections created by data that would not be fetched (I'm creating an additional array for that). Is there a nice way to insert that array without breaking all the nice NSFetchedResultsController behavior?
Update
What I've tried so far is to manually adjust every use of the indexPath. When ever a method (i.e. -tableView:numbersOfRowsInSection) get's called I check if it's the first section and if so I would take the data from my array instead of the NSFetchedResultsController. If not, I would just create a new NSIndexPath with the original indexPath's row and the section - 1 to access the fetchedResults. This seems to be a rather naive approach. At least, this does not work for me (yet).
Thanks!
–f
I created a UITableViewDataSource with a mixture of static and dynamic sections. I do it by modifying NSIndexPath like you planned. Important is to modify the NSIndexPath in the delegate methods of NSFetchedResultsControllerDelegate, too:
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
newIndexPath:(NSIndexPath *)newIndexPath
{
indexPath = [NSIndexPath indexPathForRow:indexPath.row + 1 inSection:kSectionWithAdditionalRowIndex];
if (newIndexPath) {
newIndexPath = [NSIndexPath indexPathForRow:newIndexPath.row + 1 inSection:kSectionWithAdditionalRowIndex];
}
[super controller:controller didChangeObject:anObject atIndexPath:indexPath forChangeType:type newIndexPath:newIndexPath];
}
The sample is taken from a subclass of my class CBUIFetchResultsDataSource.m, which is a generic UITableViewDataSource powered by a NSFetchedResultsController. I had to also overwrite -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section, -(id)objectAtIndexPath:(NSIndexPath*)indexPath and -(NSIndexPath*)indexPathForObject:(id)object.
I have an NSTableView where I would like to be notified if the user clicks in a column "ClickMe". I linked the entire table view to a method which can extract the clickedColumn:, but I get an absolute number and not a reference to the "ClickMe" column (which may have been moved to another place).
I could of course program my own search algorithm to see if column X is actually the "Clickme" column, but that would not be very elegant. Is there a way to identify columns properly, and to receive that ID programmatically?
I found a way to do my own search in a fairly fast way, but I still have a feeling I am putting too much effort in this:
First, set the Identifier of the desired column in the Interface Builder to "ClickMeColumn". Then:
NSInteger cmColumn = [tableView columnWithIdentifier:#"ClickMeColumn"];
if ( [tableView clickedColumn] == cmColumn )
NSLog(#"Clicked me!");
I am looking for something along the lines of [tableView clickedColumnIdentifier].
What about querying NSTableView's columnAtPoint: in your table views mouseDown: or mouseUp: method?
Use any of the methods below. Called by the tableView's delegate on selection. You can extract the identifier and the title string from the relevant tableColumn.
- (void)tableView:(NSTableView *)tableView didClickTableColumn:(NSTableColumn *)tableColumn {
NSLog(#"tableView:didClickTableColumn: %#, titleString: %#", [tableColumn identifier], [[tableColumn headerCell] stringValue]);
}
- (void)tableView:(NSTableView *)tableView mouseDownInHeaderOfTableColumn:(NSTableColumn *)tableColumn {
NSLog(#"tableView:mouseDownInHeaderOfTableColumn: %#, titleString: %#", [tableColumn identifier], [[tableColumn headerCell] stringValue]);
}
From: https://developer.apple.com/library/mac/documentation/Cocoa/Reference/ApplicationKit/Classes/NSTableView_Class
I have two coloumn in NSTableView as Name and Salary with 5-10 values. I want to sort these coloumn after click on header of both the column. There is lots of data present in Internet but I am not able to use these. Please help me to do this in cocoa.
Thanks in advance and appreciate any help.
Each table column has a method setSortDescriptorPrototype
Sort descriptors are ways of telling the array how to sort itself (ascending, descending, ignoring case etc.)
Iterate over each of the columns you want as sortable and call this method on each of those columns, and pass the required sort descriptor (In my case I'll be using the column identifier)
for (NSTableColumn *tableColumn in tableView.tableColumns ) {
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:tableColumn.identifier ascending:YES selector:#selector(compare:)];
[tableColumn setSortDescriptorPrototype:sortDescriptor];
}
After writing this piece of initialization code, NSTableViewDataSource has a method - (void)tableView:(NSTableView *)aTableView sortDescriptorsDidChange:(NSArray *)oldDescriptors that notifies you whenever a sort descriptor is changed, implement this method in the data source and send a message to the data array to sort itself
- (void)tableView:(NSTableView *)aTableView sortDescriptorsDidChange:(NSArray *)oldDescriptors
{
self.data = [self.data sortedArrayUsingDescriptors:sortDescriptors];
[aTableView reloadData];
}
This method will get fired each time a column header is clicked, and NSTableColumn shows a nice little triangle showing the sorting order.
I stumbled upon this question while looking for the easiest way of implementing something similar. Although the original question is old, I hope someone finds my answer useful! Please note that I am using Xcode 5.1.1
Ok so to do this you need to:
select the actual column you want to sort in your table.
In your Attributes Inspector you need to fill in two fields: Sort Key, and Selector.
In the Sort Key field, you need to enter the value of your Identifier. The value of your Identifier is located in your Identity Inspector.
In the Selector field you need to enter a suitable selector method based on the object type in the column. The default method is; compare:
Based on the Table View Programming Guide for Mac. The compare: method works with NSString, NSDate, and NSNumber objects. If your table column contains only strings, you may want to consider using the caseInsensitiveCompare: method if case sensitivity is unimportant. However, consider replacing these method signatures with the localizedCompare: or localizedCaseInsensitiveCompare: methods to take into the account the user’s language requirements.
Finally, you need to declare the tableView:sortDescriptorsDidChange: method in your Table View Controller in the format shown below:
-(void)tableView:(NSTableView *)mtableView sortDescriptorsDidChange:(NSArray *)oldDescriptors
{
[listArray sortUsingDescriptors: [mtableView sortDescriptors]];
[tableView reloadData];
}
Just had lately the same issue to get tableView sorted.
My approach :
bind your sortDescriptors to tableview's arrayController
bind tableview's sortDescriptors to Arraycontroller's sort descriptor
perform the settings in attribute inspector (see Tosin's answer above)
Worked perfect for me. No need to set prototypes for columns or something else.
Thanks very much ,It is usefullly for my question.
my code like this
First, set unique values in the XIB interface，like name...
- (void)viewDidLoad {
[super viewDidLoad];
self.itemTableView.dataSource = self;
self.itemTableView.delegate = self;
self.itemTableView.selectionHighlightStyle = NSTableViewSelectionHighlightStyleRegular;
self.itemTableView.usesAlternatingRowBackgroundColors = YES;
for (NSTableColumn *tableColumn in self.itemTableView.tableColumns ) {
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:tableColumn.identifier ascending:NO selector:#selector(compare:)];
[tableColumn setSortDescriptorPrototype:sortDescriptor];
}
}
-(void)tableView:(NSTableView *)tableView sortDescriptorsDidChange:(NSArray<NSSortDescriptor *> *)oldDescriptors{
NSLog(#"sortDescriptorsDidChange：%#",oldDescriptors);
[self.itemArr sortUsingDescriptors:[tableView sortDescriptors]];
[self.itemTableView reloadData];
}
Right now I have a table with a number of PDFs listed. From the table the user can select a PDF and it will be displayed in the view. Right now when I select and item from the table it should change the detailView's detailItem to the item in the row I selected, in addition change the variable i to the selected row number.
Here is what my DidSelectRowAtIndexPath method looks like:
- (void)tableView:(UITableView *)aTableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
affirmaPDFViewController.detailItem = [NSString stringWithFormat:#"%#", [listOfPDF objectAtIndex:indexPath.row]];
affirmaPDFViewController.i = indexPath.row;
NSLog(#"%d", indexPath.row); //returns the proper value
NSLog(#"%#", [listOfPDF objectAtIndex:indexPath.row]); //returns the proper value
//NSLog(#"%d", affirmaPDFViewController.i); //DOES NOT return the proper value
//NSLog(#"%#", affirmaPDFViewController.detailItem); //DOES NOT return the proper value
}
for the first two NSLog's, they display the proper information, however when i check the last two they come out with affirmaPDFViewController.i = 0 and affirmaPDFViewController.detailItem = null. When i need the affirmaPDFViewController.i= indexPath.row, and affirmaPDFViewController.detailItem = the item in the row I selected.
Anyone know why they aren't coming out with the proper values?
Thanks in advance!
Your instance of affirmaPDFViewController is nil. Check the method where it's created, and remember you can set a breakpoint in the debugger to see if it's a valid object or not.