A Swift binding framework that simplifies reactive UI updates and data flow with type-safe bindings.
Bond is a Swift binding framework that bridges reactive and imperative programming paradigms, enabling seamless data flow between UI components and business logic. It provides a simple, powerful, and type-safe way to handle state changes, reactive data sources, and UI bindings without manual event handling. Built on top of ReactiveKit, it complements reactive data flows with bindings, reactive delegates, and reactive data sources.
iOS, macOS, and tvOS developers using Swift who need to manage state changes and UI updates in UIKit or AppKit applications, particularly those adopting reactive programming patterns or the Binder Architecture.
Developers choose Bond for its minimal boilerplate, type-safe bindings, and seamless integration with existing UIKit/AppKit workflows, offering a multi-paradigm approach that makes reactive programming accessible while supporting fine-grained observable collections and two-way bindings.
A Swift binding framework
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Enables automatic, compile-time checked connections between properties, such as binding a text field's text to a label with `textField.reactive.text.bind(to: label)`, eliminating manual event handling.
Provides `MutableObservableArray` to observe inserts, deletes, and updates in arrays, allowing efficient dynamic UI updates in table or collection views without manual data source implementations.
Converts delegate method calls into signals using ObjC runtime, simplifying event handling for UIKit components like accessing `tableView.reactive.selectedRowIndexPath` without custom delegates.
Leverages ReactiveKit's operators (e.g., `map`, `combineLatest`) for functional transformations, enabling complex data flows like combining text field inputs to update button states.
Bond is built on top of ReactiveKit, which introduces an additional learning curve and complexity for developers not already familiar with reactive programming concepts.
The framework is primarily designed for UIKit/AppKit, with no native support for SwiftUI bindings, making it less suitable for modern Apple UI development without manual bridging.
Requires manual disposal using bags (e.g., `.dispose(in: bag)`), which can be error-prone and adds boilerplate compared to automatic memory management systems in pure Swift.
Bond 7 required a migration guide, indicating a pattern of non-backward-compatible updates that can disrupt existing codebases and require significant refactoring.