如何访问UITableView子视图选择？

Question

I've created a UIViewController ( AnestDrugCalcViewController ) that has a button that opens a UITableViewController ( DrugTableViewController ) to select a drug. The DrugTableViewController is populated based on a NSMutableArray and is made up of several NSDictionary objects (drugName, drugDose, drugConcentration, etc.).

I'm able to open DrugTableViewController by pushing it onto the navigation stack, but I can't figure out how to tell from my AnestDrugCalcViewController what the properties of the selected item are.

//  DrugTableViewController.h
#import <UIKit/UIKit.h>

@interface DrugTableViewController : UITableViewController {
NSMutableArray          *drugList;
NSIndexPath *lastIndexPath;
IBOutlet UITableView    *myTableView;
NSObject *selectedDrug;
}

@property (nonatomic, retain) NSArray *drugList;
@property (nonatomic, retain) UITableView *myTableView;
@property (nonatomic, retain) NSObject *selectedDrug;

@end

Top of DrugTableViewController.m #import "DrugTableViewController.h"

@implementation DrugTableViewController

@synthesize drugList,myTableView, selectedDrug; 

Answer 1

You could have a property in vwDrugTable that stores the the selected row when the user selects it. Then, after that table view is removed and you are back in vwCalc , just get the data from that property.

So that means in vwDrugTable , have something like this:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    self.selectedDrug = [self.drugs objectAtIndex:indexPath.row];
}

Then just access selectedDrug from vwCalc when you need it.

Answer 2

UITableView 's -indexPathForSelectedRow method will allow you to determine which row is selected:

NSIndexPath *selectionPath = [vwDrugTable indexPathForSelectedRow];
if (index) {
    NSLog(@"Selected row:%u in section:%u", [selectionPath row], [selectionPath section]);
} else {
    NSLog(@"No selection");
}

To be notified when the selection changes, implement tableView:didSelectRowAtIndexPath: in your table view delegate:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"Selection Changed");
}