iOS ilovalarida ma'lumotlar to'plamlarini qanday…

iOS'da ma'lumotlar to'plamlarini yangilashning bir nechta usullari mavjud:

reloadData(): Eng oddiy, ammo eng kam samarali usul. Barcha ma'lumotlarni to'liq yangilaydi.
```
tableView.reloadData()
```
beginUpdates()/endUpdates(): Paket bo'lib o'zgarishlarni (qatorlar/bo'limlar qo'shish, o'chirish, yangilash) animatsiya bilan amalga oshirish imkonini beradi. Indekslarni qo'lda boshqarishni talab qiladi.
```
tableView.beginUpdates()
tableView.insertRows(at: [IndexPath(row: newData.count - 1, section: 0)], with: .automatic)
tableView.endUpdates()
```
performBatchUpdates(_:completion:): beginUpdates()/endUpdates()'ga nisbatan yanada zamonaviy va afzal qilingan. Shuningdek, paket bo'lib o'zgarishlarni animatsiya bilan amalga oshiradi.
```
collectionView.performBatchUpdates({
    collectionView.insertItems(at: [IndexPath(item: newData.count - 1, section: 0)])
}, completion: nil)
```

diffable data sources: iOS 13 dan boshlab, UICollectionViewDiffableDataSource va UITableViewDiffableDataSource ma'lumotlarni boshqarish uchun deklarativ usul taqdim etadi. Eski va yangi ma'lumotlar versiyalari orasidagi farqlar Diffing yordamida avtomatik hisoblanadi.

struct MySection: Hashable {
    let id = UUID()
}

struct MyItem: Hashable {
    let id = UUID()
    let title: String
}

var dataSource: UICollectionViewDiffableDataSource<MySection, MyItem>!

// ...

var snapshot = NSDiffableDataSourceSnapshot<MySection, MyItem>()
snapshot.appendSections([MySection()])
snapshot.appendItems([MyItem(title: "New Item")])
dataSource.apply(snapshot, animated: true)

Core Data'dan olingan natijalar nazoratchisi: Core Data bilan ishlash uchun, NSFetchedResultsController avtomatik ravishda o'zgarishlarni kuzatib boradi va UI ni yangilash uchun delegatga xabar beradi.

// NSFetchedResultsController delegatida
- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedObjectChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;
        // ... boshqa NSFetchedObjectChangeType turlari
    }
}

Yangilash usulini tanlash, yangilashning murakkabligi, animatsiya ehtiyoji va foydalanilayotgan arxitekturaga (masalan, Core Data) bog'liq. Diffable data sources yangi loyihalar uchun eng tavsiya etilgan yondashuvdir.

iOS ilovalarida ma'lumotlar to'plamlarini qanday yangilash mumkin?