Created
April 25, 2016 02:22
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An attempt of UICollectionViewCell Decoration and Configuration
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| import Foundation | |
| import UIKit | |
| // MARK: - Decorator and Configurator protocols | |
| protocol Decorator { | |
| associatedtype Decoratable | |
| init(dependencyManager: VDependencyManager) | |
| func decorate(cell: Decoratable) | |
| } | |
| protocol Configurator { | |
| associatedtype CellData | |
| associatedtype Configuratable | |
| func configure(cell: Configuratable, with: CellData) | |
| } | |
| // MARK: - Concrete implementations | |
| struct HashtagCellDecorator: Decorator { | |
| let dependencyManager: VDependencyManager | |
| init(dependencyManager: VDependencyManager) { | |
| self.dependencyManager = dependencyManager | |
| } | |
| func decorate(cell: HashtagCell) { | |
| cell.titleLabel.font = dependencyManager.fontForKey() | |
| } | |
| } | |
| struct HashtagCellConfigurator: Configurator { | |
| func configure(cell: HashtagCell, with hashtag: Hashtag) { | |
| cell.titleLabel.text = hashtag.tag | |
| } | |
| } | |
| // MARK: - Data Source and Cell | |
| class HashtagCollectionViewDataSource { | |
| var collectionView: UICollectionView? | |
| var dependencyManager: VDependencyManager! | |
| var hashtagDecorator: HashtagCellDecorator { | |
| return HashtagCellDecorator(dependencyManager: dependencyManager) | |
| } | |
| let hashtagConfigurator = HashtagCellConfigurator() | |
| func cellForItemAtIndex() { | |
| let cell = collectionView?.dequeueReusableCellWithReuseIdentifier("", forIndexPath: NSIndexPath(forItem: 0, inSection: 0)) as! HashtagCell | |
| hashtagDecorator.decorate(cell) | |
| hashtagConfigurator.configure(cell, with: Hashtag()) | |
| } | |
| } | |
| class HashtagCell: UICollectionViewCell { | |
| @IBOutlet private(set) var titleLabel: UILabel! | |
| } | |
| /* | |
| Pros: | |
| 1. Views are dumb - just holds the Outlets | |
| 2. Controllers are thin - just a middleman passing data around | |
| 3. Separate of concerns: If we want to decorate the same cell differently (5.0 vs 4.0, experiments, etc..) -> Make a new Decorator | |
| 4. Unified way for cell decoration and configuration | |
| 5. Concrete Decorator and Configurators have the freedom to define what they can do | |
| 6. We could expand this to custom views in general | |
| Cons: | |
| 1. cells need to expose their IBOutlets as `private(set) var` | |
| 2. Some extra work to do for simple cells | |
| 3. How can we prevent decorating the cells multiple times? | |
| */ | |
| // MARK: - Models for testing | |
| struct Hashtag { | |
| let tag = "test tag name" | |
| } | |
| struct VDependencyManager { | |
| func fontForKey() -> UIFont { | |
| return UIFont() | |
| } | |
| } |
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