StackOverflow2013

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copied!<p>You should have a proper data model. For example, if you have 30 cells, there is no need to display all the 30 cells in your tableview. Doing that will be a waste of resources and that why we always implement dequereuseable method in tableview delegates.</p> <p>Having said that, do something like this</p> <pre><code>#import <UIKit/UIKit.h> @interface ViewController : UITableViewController @end </code></pre> <p>Implementation as below</p> <pre><code> #import "ViewController.h" @interface ViewController () { NSArray *numbersList; } -(float) calculateAvg; @end @implementation ViewController - (id)initWithStyle:(UITableViewStyle)style { self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; numbersList = [[NSArray alloc]initWithObjects:@"10",@"23",@"34",@"43",@"57",@"64",@"77",@"88",@"95",nil]; [[self tableView] setDelegate:self]; [[self tableView] setDataSource:self]; } </code></pre> <p>#pragma mark - Table view data source</p> <pre><code>- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { // Return the number of sections. return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. Plus one to hold average return [numbersList count] + 1; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"]; if(cell == nil) { cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"]; } if([indexPath row] < [numbersList count]) { [[cell textLabel] setText:[numbersList objectAtIndex:[indexPath row]]]; } else { float avg = [self calculateAvg]; [[cell textLabel] setText:[NSString stringWithFormat:@"%f",avg]]; } return cell; } -(float) calculateAvg { float avg = 0; for(int idx=0;idx<[numbersList count];idx++) { int tempValue = [[numbersList objectAtIndex:idx] intValue]; avg = avg + tempValue; } return (avg / [numbersList count]); } </code></pre>

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