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9:38
We refactored the AppCoordinator class in the previous episode. The purchase flow is no longer managed by the AppCoordinator class. We created a child coordinator, the BuyCoordinator class, which is responsible for managing the purchase flow.
in Patterns
10:51
The AppCoordinator class is responsible for navigation. It defines the flow of the application and instantiates the view controllers of the project. View controllers no longer need to worry about navigation, which makes them focused and lightweight. There is a cost to this shift in responsibilities, though. As the project grows, the complexity of the AppCoordinator class increases.
in Patterns
12:36
In the previous episodes, we applied the coordinator pattern to a typical Model-View-Controller application. A coordinator handles navigation and, as a result, simplifies the implementation of the view controllers of the project. View controllers are no longer tightly coupled, which increases their reusability. That brings us to the focus of this episode. What are the benefits and possibilities of reusable, loosely coupled view controllers?
in Patterns
10:26
With the foundation in place, it's time to use the coordinator to navigate between view controllers. Remember that the goal is to put the coordinator in charge of (1) instantiating view controllers and (2) navigating between view controllers. This means that we need to make a few changes.
in Patterns
9:05
If you're familiar with Cocoacasts, then you may know that I'm allergic to string literals randomly scattered in a project. Open AppCoordinator.swift and navigate to the showQuotes() method.
in Patterns
9:19
The previous episode zoomed in on the drawbacks of the UIKit framework. The coordinator pattern can help us work around these limitations. Coordinators are in some ways similar to view models. A coordinator is nothing more than an object that removes a responsibility from a view controller. It is responsible for navigation and defines the flow of the application.
in Patterns
8:11
The UIKit framework makes it trivial to navigate between view controllers. You can perform a segue if you use storyboards or you can programmatically navigate from one view controller to the next. This is convenient, but there's also a cost. If you use the API the UIKit framework offers you to navigate between view controllers, then you have less control and flexibility. This can become a significant problem as your project grows.
in Patterns
14:39
The underlying idea of a dispatch semaphore isn't difficult to understand. Remember that a semaphore is nothing more than a variable that can be incremented and decremented in a thread safe manner. The most challenging aspect of a dispatch semaphore is correctly using it. Working in a multithreaded environment is complex. Semaphores help you manage that complexity.
in Swift
14:50
Dispatch groups are a bit more advanced, but I hope the previous episodes have shown that they can be incredibly useful to manage complex tasks. The DispatchSemaphore class is another more advanced member of Apple's concurrency library. While there are some similarities between dispatch semaphores and dispatch groups, dispatch semaphores are more powerful and more versatile.
in Swift
8:42
Most developers don't use dispatch groups on a daily basis. They have a limited use, but I want to show you in this episode that the DispatchGroup class can greatly simplify the code you write when used correctly.
in Swift
10:11
Apple's concurrency library is sparsely documented and that discourages developers from using the more advanced APIs of Grand Central Dispatch. This episode focuses on one of those more advanced APIs, dispatch groups.
in Swift
7:54
In the previous episode, I showed you the setup I use to log messages with CocoaLumberjack. There's a lot more CocoaLumberjack has to offer. In this episode, you learn how to forward log messages to a remote server. I show you how to integrate CocoaLumberjack and PaperTrail, a popular solution for managing logs. We also take a look at an alternative approach, that is, how to send log messages to Fabric. Logs can be very helpful in combination with crash reporting.
in Programming