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We won t dwell too much on the more dynamic possibilities of the UITableViewController here. For the most part, you ll either use it to hold relatively static data (as you do here) or use it to interact with a navigation controller (as you ll see in chapter 7). But before we finish up with table view controllers, we ll look at one other fundamental: selection.

To use median( ), simply pass a reference to an array containing the values, and the middle value is returned. Notice that a copy of the array is made by calling System.arraycopy( ). It is the copy that is sorted. The copy, not the original array, must be sorted to avoid changing the order of the original data. The original order is important for displaying the data in graphical form, as well as for certain other statistical measurements.

If you try the sample tableex application that you ve been building throughout section 5.3, you ll see that individual elements in a table view can be selected. In table 5.7, you saw that some properties apply explicitly to selected cells. For example, the following maintains the color of your text when it s selected, rather than changing it to white, as per the default:

Summary

cell.textLabel.textColor = [[[masterColorList objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"colorValue"];

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The mode of a sample is the value of the most frequently occurring element. For example, given the sample 123345677789 the mode is 7 because it occurs more than any other element. The mode may not be unique. For example, given 10 20 30 30 40 50 60 60 70 both 30 and 60 occur twice. Either could be the mode. Such a set is referred to as bimodal. A set that has only one mode is called unimodal. For the purposes of this book, when a set contains more than one mode, the first one found is used. If no value occurs more often than any other, the sample has no mode. The following mode( ) method finds the mode for a set of values:

To set this value, you must add this line of code to your tableView:didSelectRowAtIndexPath: method. Also note that this is another example of using nested arrays to provide section- and row-specific information for a table list. The tableView:didSelectRowAtIndexPath: method is the most important for dealing with selections. This method appears in the UITableViewDelegate protocol and tells you when a row has been selected. The message includes an index path, which, as you ve already seen, contains both a row and a section number. Here s a simple example of how you might use this method to checkmark items in your list:

/* Returns the mode of a set of values. A NoModeException is thrown if no value occurs more frequently than any other. If two or more values occur with the same frequency, the first value is returned. */ public static double mode(double[] vals) throws NoModeException { double m, modeVal = 0.0; int count, oldcount = 0; for(int i=0; i < vals.length; i++) { m = vals[i]; count = 0; // Count how many times each value occurs. for(int j=i+1; j < vals.length; j++)

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { [[tableView cellForRowAtIndexPath:indexPath] setAccessoryType:UITableViewCellAccessoryCheckmark]; }

With the Thread the Needle application, we have implemented a very simple and useful example of threading an iPhone application and controlling the threads. You should now understand that threading can give the user more control over the application and make the application more responsive to the user while background work is being performed. A threaded application can add a more professional touch to your application; with it, you can improve application responsiveness and perform tasks in the background independent of the user.

You can easily retrieve the selected cell by using the index path, and then you use that information to set the accessory value. You ll make more use of cell selection in chapter 7, when we talk about navigation controllers.

if(m == vals[j]) count++; /* If this value occurs more frequently than the previous candidate, save it. */ if(count > oldcount) { modeVal = m; oldcount = count; } } if(oldcount == 0) throw new NoModeException(); else return modeVal; }

Summary

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