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Objective-C iOS Development for Legacy & Enterprise Apps · Ders

Tablo Görünümleri ve Koleksiyon Görünümleri

Dinamik içerik listelerini ve ızgaralarını görüntülemek için UITableView ve UICollectionView'ı uygulayın ve özelleştirin.

Tablo Görünümleri ve Koleksiyon Görünümleri, CoddyKit'te ücretsiz bir Objective-C iOS Development for Legacy & Enterprise Apps dersidir. Bu, 4 dersinin 3. dersidir. Aşağıdan dersin tamamını ücretsiz okuyabilir, sonra tarayıcıda yerleşik kod editörü ve 7/24 yapay zeka koçu ile uygulamalı olarak pratik yapabilirsin. Bu, Objective-C iOS Development for Legacy & Enterprise Apps öğrenme yolunun bir parçasıdır ve ilerlemeniz web ve CoddyKit uygulaması arasında senkronize olur. Objective-C iOS Development for Legacy & Enterprise Apps kursu toplamda 4 dersten oluşur.

Bu dersin bazı bölümleri henüz çevrilmemiş olup İngilizce olarak gösterilmektedir.

Meet UITableView

Welcome to lists! UITableView is a fundamental UIKit component used to display scrollable lists of data, commonly seen in apps for settings, contacts, or news feeds.

It's optimized for efficiency, only rendering the cells visible on screen, which makes it perfect for long lists without performance issues.

Data & Behavior for Tables

To work with a UITableView, you primarily interact with two protocols:

  • UITableViewDataSource: This tells the table view what data to display (e.g., number of rows, content for each cell).
  • UITableViewDelegate: This handles how the table view behaves (e.g., row selection, height of rows, custom actions).

Your view controller typically conforms to both.

Your First Table View

Let's create a basic UITableView programmatically. This code snippet assumes it's within a UIViewController subclass that is set as the app's root view controller.

We add the table view to our controller's main view, making it fill the screen.

#import <UIKit/UIKit.h>

@interface MyTableViewController : UIViewController
@end

@implementation MyTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    // Create a UITableView filling the view
    UITableView *tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    
    // We'll set the data source and delegate in next steps
    // tableView.dataSource = self; 
    
    [self.view addSubview:tableView];
}
@end

Populating Your Table

To display data, our MyTableViewController needs to conform to the UITableViewDataSource protocol. This means implementing two key methods:

  • numberOfRowsInSection: Tells the table how many rows to expect.
  • cellForRowAtIndexPath: Provides the UITableViewCell for each row.

We also register a basic UITableViewCell for reuse.

#import <UIKit/UIKit.h>

@interface MyTableViewController : UIViewController <UITableViewDataSource>
@property (nonatomic, strong) NSArray *dataItems;
@property (nonatomic, strong) UITableView *tableView;
@end

@implementation MyTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.dataItems = @[@"Apple", @"Banana", @"Cherry", @"Date"];
    
    self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.tableView.dataSource = self; // Set self as data source
    
    // Register a basic UITableViewCell class for reuse
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
    
    [self.view addSubview:self.tableView];
}

#pragma mark - UITableViewDataSource methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.dataItems.count; // Number of items in our data array
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // Dequeue (reuse) or create a cell
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    cell.textLabel.text = self.dataItems[indexPath.row]; // Set cell's text
    return cell;
}
@end

Making Cells Unique

UITableViewCell is the view that displays content for each row. You can customize its appearance by:

  • Using built-in styles (e.g., UITableViewCellStyleSubtitle).
  • Adding subviews directly to cell.contentView.
  • Creating a custom subclass of UITableViewCell for complex layouts.

Always reuse cells with dequeueReusableCellWithIdentifier: for performance.

#import <UIKit/UIKit.h>

@interface MyTableViewController : UIViewController <UITableViewDataSource>
@property (nonatomic, strong) NSArray *dataItems;
@property (nonatomic, strong) UITableView *tableView;
@end

@implementation MyTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.dataItems = @[@"Apple", @"Banana", @"Cherry", @"Date"];
    
    self.tableView = [[UITableView alloc] initWithFrame:self.view.bounds style:UITableViewStylePlain];
    self.tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.tableView.dataSource = self;
    // Registering a cell class (we'll use the default for demo)
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"CustomCell"];
    
    [self.view addSubview:self.tableView];
}

#pragma mark - UITableViewDataSource methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return self.dataItems.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // Dequeue a cell, using UITableViewCellStyleSubtitle for more options
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CustomCell" forIndexPath:indexPath];
    
    cell.textLabel.text = self.dataItems[indexPath.row];
    cell.detailTextLabel.text = [NSString stringWithFormat:@"Item #%ld", (long)indexPath.row + 1];
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // Add an arrow
    
    return cell;
}
@end

Flexible Grids: UICollectionView

While UITableView excels at vertical lists, UICollectionView offers much more flexibility for displaying content in customizable layouts, like grids, carousels, or complex dashboards.

It's ideal when you need to arrange items in non-linear or highly visual ways, such as photo galleries, product catalogs, or tag clouds.

Collection View's Data & Flow

Similar to table views, collection views rely on a UICollectionViewDataSource to provide data and a UICollectionViewDelegate for interaction.

A key difference is the UICollectionViewLayout. This object defines how items are arranged (e.g., grid, flow, custom). The most common is UICollectionViewFlowLayout for grid-like structures.

Building Your First Collection

Let's set up a basic UICollectionView. We'll also need to provide a UICollectionViewLayout to tell it how to arrange its items.

UICollectionViewFlowLayout is a good starting point for simple grids, allowing you to define item sizes and spacing.

#import <UIKit/UIKit.h>

@interface MyCollectionViewController : UIViewController
@property (nonatomic, strong) UICollectionView *collectionView;
@end

@implementation MyCollectionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    
    // Create a flow layout for grid arrangement
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(100, 100); // Size for each item
    layout.minimumInteritemSpacing = 10;    // Min spacing between items in a row
    layout.minimumLineSpacing = 10;         // Min spacing between rows
    
    self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
    self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.collectionView.backgroundColor = [UIColor systemGroupedBackgroundColor]; // For contrast
    
    // We'll set the data source in the next step
    // self.collectionView.dataSource = self;
    
    [self.view addSubview:self.collectionView];
}
@end

Populating Your Collection

To display items, our MyCollectionViewController needs to conform to UICollectionViewDataSource. It's similar to UITableViewDataSource:

  • numberOfItemsInSection: Specifies the number of items.
  • cellForItemAtIndexPath: Provides the UICollectionViewCell for each item.

Remember to register a cell class or nib before dequeuing!

#import <UIKit/UIKit.h>

@interface MyCollectionViewController : UIViewController <UICollectionViewDataSource>
@property (nonatomic, strong) NSArray *dataItems;
@property (nonatomic, strong) UICollectionView *collectionView;
@end

@implementation MyCollectionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.dataItems = @[@"Red", @"Green", @"Blue", @"Yellow", @"Orange", @"Purple"];
    
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(80, 80);
    layout.minimumInteritemSpacing = 5;
    layout.minimumLineSpacing = 5;
    layout.sectionInset = UIEdgeInsetsMake(5, 5, 5, 5); // Padding around sections
    
    self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
    self.collectionView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
    self.collectionView.backgroundColor = [UIColor systemGroupedBackgroundColor];
    self.collectionView.dataSource = self; // Set self as data source
    
    // Register a basic UICollectionViewCell class
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"CollectionCell"];
    
    [self.view addSubview:self.collectionView];
}

#pragma mark - UICollectionViewDataSource methods

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.dataItems.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionCell" forIndexPath:indexPath];
    
    // Simple customization: set background color based on item
    NSArray *colors = @[[UIColor redColor], [UIColor greenColor], [UIColor blueColor], [UIColor yellowColor],
                            [UIColor orangeColor], [UIColor purpleColor]];
    cell.backgroundColor = colors[indexPath.item % colors.count];
    
    // Add a label to the cell for text (optional)
    UILabel *label = (UILabel *)[cell.contentView viewWithTag:100];
    if (!label) {
        label = [[UILabel alloc] initWithFrame:cell.contentView.bounds];
        label.tag = 100;
        label.textAlignment = NSTextAlignmentCenter;
        label.textColor = [UIColor whiteColor];
        label.font = [UIFont systemFontOfSize:14];
        [cell.contentView addSubview:label];
    }
    label.text = self.dataItems[indexPath.item];
    
    return cell;
}
@end

Table vs. Collection

Both UITableView and UICollectionView display lists of data, but they have different strengths.

Which of the following is a primary advantage of using UICollectionView over UITableView?

Recap: Lists & Grids

We explored UITableView for displaying efficient vertical lists and UICollectionView for highly customizable grid and non-linear layouts.

  • Both use Data Source and Delegate protocols to manage content and behavior.
  • UITableView is simpler for standard, single-column lists.
  • UICollectionView uses a UICollectionViewLayout for powerful and custom visual arrangements.

Mastering these components is crucial for building dynamic and engaging iOS user interfaces.

Sıkça Sorulan Sorular

“Tablo Görünümleri ve Koleksiyon Görünümleri” dersi ücretsiz mi?

Evet — “Tablo Görünümleri ve Koleksiyon Görünümleri” dersin tüm metni burada web'de ücretsiz olarak okunabilir. Etkileşimli olarak pratik yapmak (yerleşik kod editörü ve 7/24 yapay zeka koçu) ve Objective-C iOS Development for Legacy & Enterprise Apps kursunun geri kalanını açmak için CoddyKit PRO'ya yükselt. Objective-C iOS Development for Legacy & Enterprise Apps kursu toplamda 4 dersten oluşur.

“Tablo Görünümleri ve Koleksiyon Görünümleri” dersinde ne öğreneceğim?

Dinamik içerik listelerini ve ızgaralarını görüntülemek için UITableView ve UICollectionView'ı uygulayın ve özelleştirin. Objective-C iOS Development for Legacy & Enterprise Apps ile uygulamalı kodu tarayıcıda doğrudan çalıştırarak pratik yaparsın ve 7/24 yapay zeka koçu dersi çalışırken sorularını yanıtlar.

Objective-C iOS Development for Legacy & Enterprise Apps öğrenmeye başlamak için deneyim gerekli mi?

Önceden deneyim gerekmez. CoddyKit'te Objective-C iOS Development for Legacy & Enterprise Apps, başlangıçtan ileri seviyeye kadar yapılandırıldığı için buradan başlayabilir veya başından başlayıp kendi hızında ilerleme yapabilirsin. Bu, 4 dersinin 3. dersidir.

“Tablo Görünümleri ve Koleksiyon Görünümleri” dersi ne kadar sürer?

Çoğu CoddyKit dersi yaklaşık 5–10 dakika sürer. Her biri kısa ve etkileşimli olduğu için sabit ilerleme yaparsın ve web ile uygulama arasında tam olarak bıraktığın yerden devam edebilirsin.

Bu Objective-C iOS Development for Legacy & Enterprise Apps dersinde kod yazıp çalıştırabilir miyim?

Evet. Her Objective-C iOS Development for Legacy & Enterprise Apps dersi yerleşik bir kod editörü içerir, bu sayede tarayıcıda gerçek kod yazıp çalıştırabilir ve anlık yapay zeka geri bildirimi alırsın — yerel kurulum gerekli değildir.

Bu kursun tüm dersleri

  1. UIView ve UIViewController
  2. Yaygın Kullanıcı Arayüzü Denetimleri ve Olaylar
  3. Tablo Görünümleri ve Koleksiyon Görünümleri
  4. NSLayoutConstraint ile Auto Layout
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