rdv0011 / swift-combine-retry.md

Last active September 5, 2022 09:25

Retry operation in Swift/Combine.

There is a function .retry() in Combine that helps to retry a request when something goes wrong with a long runing task. Although it is not enough just to call retry() to achieve retrying logic. The retry() function does not do another request but it re-subscribes only to a publisher. The below approaches might be used to solve the problem.

Using tryCatch

To make another request the tryCatch() might be used. In the code below if the first call fails there are three attempts to retry (retry(3)) that are made:

import UIKit
import Combine
import PlaygroundSupport

enum CustomNetworkingError: Error {
    case invalidServerResponse

JeOam / Animation.md

Last active July 11, 2024 03:30

iOS Core Animation: Advanced Techniques, Part 1: The Layer Beneath

Author: https://www.cyanhall.com/

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

martnst / xliff-editors.md

Last active September 10, 2024 01:26

XLIFF Editors

Saúl Moreno Abril asam139

Using tryCatch

1. The Layer Tree

Editors

resources