SnapKit/Masonry
Masonry
Masonry is a declarative UI layout engine and domain-specific language for defining layout constraints on iOS and macOS. It serves as a wrapper for native Apple layout constraints, providing a system for positioning views on a screen by declaring rules and priorities.
The library implements a fluent interface that uses chainable method calls to define complex screen layouts. This approach replaces native configuration calls with an expressive syntax for generating layout rules.
The engine includes capabilities for managing constraint priorities to resolve layout conflicts and tools for updating or resetting layout constants at runtime. It also provides debugging utilities that assign human-readable identifiers to views and constraints to isolate errors within the system layout logs.
Features
- iOS UI Layout - Provides a declarative DSL for defining adaptive user interfaces using constraints on iOS and macOS.
- Swift UI Constraints Wrappers - Wraps native Apple layout constraints in a streamlined interface for easier view positioning.
- Swift Auto Layout DSL - Implements a domain-specific language for defining NSLayoutConstraints using an expressive, chainable syntax.
- Fluent Interfaces - Implements a fluent interface with chainable method calls for expressive and readable layout definitions.
- Constraint Priority Assignment - Maps custom priority levels to native constraints to resolve layout conflicts during rendering.
- Fluent Constraint APIs - Offers a fluent API for defining complex screen layouts using a chain of commands.
- Declarative Layout Engines - Functions as a declarative engine for building user interfaces via constraints and priorities.
- Constraint-Based - Provides a high-level wrapper syntax that simplifies the generation of native Apple layout constraints.
- Dynamic Constraint Constants - Provides a system for tracking and updating layout constants at runtime without manual references.
- Layout Debugging Utilities - Includes utilities for naming views and constraints to isolate and fix layout errors in the console.
- Layout Identifier Attachments - Attaches human-readable identifiers to native constraints to improve the clarity of system layout logs.
- Adaptive View Hierarchies - Enables the construction of intricate screen layouts that scale correctly across different device sizes.
- Constraint Lifecycle Management - Allows clearing existing positioning rules for a view and applying a new set of layout definitions.
- Dynamic Constraint Modification - Enables updating the fixed values of existing layout rules without manual constraint references.
- Element Positioning - Allows updating layout constants and resetting constraints at runtime to dynamically reposition elements.
- Constraint Conflict Debugging - Helps identify and resolve conflicting layout constraints by assigning readable names to views and rules.
- Layout Frameworks - Chainable and expressive syntax for Auto Layout constraints.
- UI Layout and AutoLayout - Lightweight layout framework using elegant chainable syntax.
- UI Layout Tools - Chainable syntax for Auto Layout constraints.
