iOS - Table View

It is used for displaying a vertically scrollable view which consists of a number of cells (generally reusable cells). It has special features like headers, footers, rows, and section.
delegate
dataSource
rowHeight
sectionFooterHeight
sectionHeaderHeight
separatorColor
tableHeaderView
tableFooterView
- (UITableViewCell *)cellForRowAtIndexPath:(NSIndexPath *)indexPath
- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths
withRowAnimation:(UITableViewRowAnimation)animation
- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier
- (id)dequeueReusableCellWithIdentifier:(NSString *)identifier
forIndexPath:(NSIndexPath *)indexPath
- (void)reloadData
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths
withRowAnimation:(UITableViewRowAnimation)animation
- (NSArray *)visibleCells
Step 1 − Let's add a tableview in ViewController.xib as shown below.
Step 2 − Set delegate and dataSource to file owner for tableview by right-clicking and selecting datasource and delegate. Setting dataSource is shown below.
Step 3 − Create an IBOutlet for tableView and name it as myTableView. It is shown in the following images.
Step 4 − Then add an NSMutableArray for holding the data to be displayed in the table view. 
Step 5 − Our ViewController should adopt the UITableViewDataSource and UITableViewDelegate protocols. The ViewController.h should look as shown below.
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDataSource,
   UITableViewDelegate> {
   IBOutlet UITableView *myTableView;
   NSMutableArray *myData;
}
@end
Step 6 − We should implement the required tableview delegate and dataSource methods. The updated ViewController.m is as follows −
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
   [super viewDidLoad];
   // table view data is being set here	
   myData = [[NSMutableArray alloc]initWithObjects:
   @"Data 1 in array",@"Data 2 in array",@"Data 3 in array",
   @"Data 4 in array",@"Data 5 in array",@"Data 5 in array",
   @"Data 6 in array",@"Data 7 in array",@"Data 8 in array",
   @"Data 9 in array", nil];
   // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
   [super didReceiveMemoryWarning];
   // Dispose of any resources that can be recreated.
}

#pragma mark - Table View Data source 
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:
   (NSInteger)section {
   return [myData count]/2;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:
   (NSIndexPath *)indexPath {
   static NSString *cellIdentifier = @"cellID";
    
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:
   cellIdentifier];
   
   if (cell == nil) {
      cell = [[UITableViewCell alloc]initWithStyle:
      UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
   }
   
   NSString *stringForCell;
   
   if (indexPath.section == 0) {
      stringForCell= [myData objectAtIndex:indexPath.row];
   } else if (indexPath.section == 1) {
      stringForCell= [myData objectAtIndex:indexPath.row+ [myData count]/2];
   }
   [cell.textLabel setText:stringForCell];
   return cell;
}

// Default is 1 if not implemented
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
   return 2;
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:
   (NSInteger)section {
   NSString *headerTitle;
   
   if (section==0) {
      headerTitle = @"Section 1 Header";
   } else {
      headerTitle = @"Section 2 Header";
   }
   return headerTitle;
}

- (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:
   (NSInteger)section {
   NSString *footerTitle;
      
   if (section==0) {
      footerTitle = @"Section 1 Footer";
   } else {
      footerTitle = @"Section 2 Footer";
   }
   return footerTitle;
}

#pragma mark - TableView delegate

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:
   (NSIndexPath *)indexPath {
   [tableView deselectRowAtIndexPath:indexPath animated:YES];
   UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
   NSLog(@"Section:%d Row:%d selected and its data is %@",
   indexPath.section,indexPath.row,cell.textLabel.text);
}
@end
Step 7 − When we run the application we'll get the following output −

    23 Lectures 
     1.5 hours 

 Ashish Sharma

    9 Lectures 
     1 hours 

 Abhilash Nelson

    14 Lectures 
     1.5 hours 

 Abhilash Nelson

    15 Lectures 
     1.5 hours 

 Abhilash Nelson

    10 Lectures 
     1 hours 

 Abhilash Nelson

    69 Lectures 
     4 hours 

 Frahaan Hussain
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