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class DeinitBlock { | |
let onDeinit: () -> Void | |
init(_ block: @escaping () -> Void) { | |
onDeinit = block | |
} | |
deinit { | |
onDeinit() | |
} | |
} |
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extension URLSessionDataTask { | |
var cancellation: DeinitBlock { | |
return DeinitBlock { [weak self] in | |
self?.cancel() | |
} | |
} | |
} |
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class URLImageTableViewCell: UITableViewCell { | |
@IBOutlet weak var urlImageView: UIImageView! | |
var urlImageLoader: DeinitBlock? | |
// new task is created, old task cancelled automatically | |
func setImage(url: URL) { | |
urlImageLoader = urlImageView.setCachedImage(url: url) | |
} | |
} |
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extension Timer { | |
var invalidation: DeinitBlock { | |
return DeinitBlock { [weak self] in | |
self?.invalidate() | |
} | |
} | |
} |
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import CoreData | |
public final class CoreDataStack { | |
public let persistentContainer: NSPersistentContainer | |
public init(_ persistentContainer: NSPersistentContainer) { | |
self.persistentContainer = persistentContainer | |
} | |
public private(set) lazy var mainContext: NSManagedObjectContext = { |
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extension NSManagedObjectContext { | |
func performTask(_ block: @escaping (NSManagedObjectContext) -> Void) { | |
perform { [unowned self] in | |
block(self) | |
} | |
} | |
} |
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extension NSFetchedResultsController { | |
var sectionCount: Int { | |
return sections?.count ?? 0 | |
} | |
} |
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extension NSFetchedResultsController { | |
@objc func entity(at row: Int) -> ResultType { | |
object(at: IndexPath(item: row, section: 0)) | |
} | |
} |
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class FetchedData<T: NSFetchRequestResult> { | |
let controller: NSFetchedResultsController<T> | |
init(_ controller: NSFetchedResultsController<T>) { | |
self.controller = controller | |
} | |
} |
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extension FetchedData { | |
subscript(_ indexPath: IndexPath) -> T { | |
return controller.object(at: indexPath) | |
} | |
} |
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