iOS tətbiqlərində məlumat toplusunu necə yeniləmək olar?
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iOS-da məlumat to'plamlarini yangilashning bir nechta usullari mavjud:
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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,UICollectionViewDiffableDataSourcevaUITableViewDiffableDataSourcema'lumotlarni boshqarish uchun deklarativ usul taqdim etadi. Eski va yangi ma'lumotlar versiyalari orasidagi farqlarDiffingyordamida 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,
NSFetchedResultsControlleravtomatik 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.