![]() ![]() use indexPathForSelectedRow to get the index path of the selected row.For example, if we want to push a view controller after a user selects a cell in a table view, we have to perform the following actions in our override of prepareForSegue(_:sender:): This, however, too closely resembles the famous KVO method: observeValueForKeyPath(_:ofObject:change:context:) which is almost universally accepted as an example of badly designed API.Īs you can see above, it's hard to provide some context when performing segues from code. Lead to code filled with giant if or switch statements. shouldPerformSegueWithIdentifier(_:sender:).Most of the methods provided for us, like The way storyboards interact with instances of view controllers isn't all it's cracked up to be, either. Storyboards are pretty good until we have to leave the land of the Interface Builder. The way we set a value of a non-private property from the outside is cumbersome too, which brings us to the next point. We'll probably end up with either optional properties for our dependencies, e.g.: This means that we can't use dependency injection via initializer, which is my preferred form of dependency injection, because it makes all dependencies explicit and enforced by the compiler.Įven when we don't use the constructor injection, dependencies still have to be provided in one way or another. UIKit does this by calling init?(coder:) on the UIViewController (sub)class. When you use a storyboard, the target view controller for a segue is created by UIKit and not by you. Additionally, some important features, like layout guides, are missing from XIBs. For example, on watchOS all the UI has to be created using storyboards. There are some indications that Apple thinks that storyboards are the way of the future. They're a really good solution to this sort of problem. In these cases storyboards act almost as a WYSIWYG tool. Let's say that we have to implement some rather static part of our app: a signup flow or some kind of help section. a prototype that you show to potential investors, they're the way to go. If you need to create something that will be later rewritten, e.g. With them it's possible to put together a simple app or a feature in just a few hours or days. Storyboards work quite well as a prototyping tool, too. Some parts of the API may seem weird from the start (especially when it comes to Swift), but overall I think that storyboards actually kept a lot of people going down the path to becoming full-fledged iOS developers who would have otherwise quit a long time ago. I have to admit that for a beginner, creating an app by dragging-and-dropping elements into a storyboard may definitely have some appeal, as it allows a student to visualize the flow of an app in a very accessible way. Like a great many of my peers, I started learning iOS development through the CS193P course humbly provided for free by Stanford University. Well, let's take a look pros and cons of storyboards in a couple of different contexts. This suggests that Apple is trying very hard to persuade us to use storyboards in all our projects, but should we actually bend to their will in all cases? When you create a new project using any of the iOS → Application templates, you end up with a Main.storyboard file in your project. What exactly is a storyboard in the context of iOS development? According to Apple, a storyboard is:Ī file that contains a visual representation of the app’s UI (user interface), showing screens of content and the transitions between them, that you work on in Interface Builder. This article discusses the majority of the known (and popular) ways of dealing with UI flow management to help you choose the one that fits your or your team's goals the best. However, enforcing a consistent approach to the way UI flow is handled within an app almost always results in higher quality of the project.Įvery decision of this magnitude requires the team to take a closer look at the pros and cons (or tradeoffs □) of all available solutions. It's always hard to answer it because preferences tend to vary even among members of the most closely-knit teams. ![]() Should we use storyboards, XIBs or write the whole UI in code? It seems that in almost every iOS project, one of the first questions developers ask themselves is: Originally published on Macoscope's Blog. ![]()
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