Introduction

Design patterns in SwiftUI, like in any programming framework, help organize code and promote maintainability, scalability, and readability. SwiftUI is a modern declarative framework, and it encourages the use of design patterns that fit its paradigm. Here are 7 common design patterns in SwiftUI:

MVVM (Model-View-ViewModel): This is a widely used pattern in SwiftUI. It separates your code into three components:

Model: Represents your data and business logic.
View: Represents the UI and its structure.
ViewModel: Acts as a bridge between the Model and View, preparing data for the View and handling user interactions.

Observable Object: SwiftUI provides the ObservableObject protocol to make data observable. It’s often used in conjunction with the @Published property wrapper. An observed object can notify views when its data changes.

EnvironmentObject: This is a way to share data throughout your SwiftUI app. It’s especially useful for global settings or user data that many views need access to.

Dependency Injection: SwiftUI makes it easy to pass data down the view hierarchy. You can inject dependencies directly into views or view models to make your code more modular and testable.

Combine Framework: Combine is a powerful framework for handling asynchronous and event-driven code. It works well with SwiftUI and can be used to create reactive data flows.

Coordinator: In more complex SwiftUI apps, you might use the Coordinator pattern to manage navigation and other complex UI components. This is often used with UIKit integrations.

ViewModifiers: SwiftUI allows you to create reusable view modifiers to encapsulate and share view styling and behavior.

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CATweaker

Overview

A helper tool for creating beautiful CAMediaTimingFunction curve.

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CATweaker come with an Xcode plugin:

CATweakerSense for Xcode

Overview

CATweakerSense is an Xcode plugin that makes working with CAMediaTimingFunction more visual.

You might use ColorSense before. It let you pick up a color right from Xcode caret.

CATweakerSense is like ColorSense, but it lets you pick a CAMediaTimingFunction curve. When you put the caret on one of your CAMediaTimingFunction, it automatically shows the actual time curve as an overlay, and you can even adjust it on-the-fly with the curve adjuster.

The plugin also adds some items to the Edit menu to enable and to disable CATweakerSense temporarily. These menu items have no keyboard shortcuts by default, but you can set them via the system’s keyboard preferences (Xcode’s own preferences won’t show them).

Installation

Install via Alcatraz.

Simply build the Xcode project and restart Xcode. The plugin will automatically be installed in ~/Library/Application Support/Developer/Shared/Xcode/Plug-ins. To uninstall, just remove the plugin from there (and restart Xcode).

If you get a “Permission Denied” error while building, please see this issue.

This is tested on OS X 10.9.2 with Xcode 6.2.

Limitations

It only works for constant point value, something like [CAMediaTimingFunction functionWithControlPoints: abc/def : 0.1 : 0.15 : 0.9]; won’t work.

Next move

I am planing to bring keyFrame animation into this plugin. So one can create more complex animation like “spring”, “decay”, “path” through the popover adjuster. If you have some great ideas, I am more than happy to hear from you.

Credits

This work is derived from the awesome ColorSense plugin of Ole Zorn(@olemoritz). Thanks Ole!

Author

Xu Lian

I’m a Mac and iOS developer, the founder of Beyondcow, follow me on Twitter or Github.

License

CATweaker & CATweakerSense is published under MIT License

Copyright (c) 2015 Xu Lian (@lianxu)

Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

NSError *error = NULL; NSDataDetector *dataDetector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:&error]; NSString *string = [_textView.textStorage string]; NSArray *matches = [dataDetector matchesInString:string options:0 range:NSMakeRange(0, [string length])]; [_textView.textStorage beginEditing]; [_textView.textStorage removeAttribute:NSForegroundColorAttributeName range:NSMakeRange(0, [string length])]; [_textView.textStorage removeAttribute:NSLinkAttributeName range:NSMakeRange(0, [string length])]; for (NSTextCheckingResult *match in matches) { NSRange matchRange = [match range]; if ([match resultType] == NSTextCheckingTypeLink) { NSURL *url = [match URL]; [_textView.textStorage addAttributes:@{NSLinkAttributeName:url.absoluteString} range:matchRange]; } } [_textView.textStorage endEditing];

Lianxu

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CATweaker – an Xcode plugin for creating beautiful CAMediaTimingFunction curve

CATweaker

Overview

CATweakerSense for Xcode

Overview

Installation

Limitations

Next move

Credits

Author

License

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