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February 23, 2018 20:09
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Generic view controllers with storyboards and view model injection
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| struct CustomViewModel { | |
| let data: String | |
| init(data: String) { | |
| self.data = data | |
| } | |
| } | |
| final class CustomViewController: ViewController<CustomViewModel> { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| print(viewModel.data) | |
| } | |
| } |
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| // Delete @UIApplicationMain from AppDelegate | |
| // Add the following main.swift file | |
| import UIKit | |
| // reference each view controller before UIApplicationMain runs | |
| // can be automated with Sourcery or SwiftGen | |
| print(CustomViewController.self) | |
| // The following is required because there's an impedence mismatch between | |
| // `CommandLine` and `UIApplicationMain` <rdar://problem/25693546>. | |
| let argv = UnsafeMutableRawPointer(CommandLine.unsafeArgv).bindMemory( | |
| to: UnsafeMutablePointer<Int8>.self, | |
| capacity: Int(CommandLine.argc) | |
| ) | |
| UIApplicationMain(CommandLine.argc, argv, nil, NSStringFromClass(AppDelegate.self)) |
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| let viewController = CustomViewController() | |
| //viewController.viewDidLoad() // assertion failure | |
| // usually in prepare(for segue: UIStoryboardSegue, sender: Any?) | |
| // compiler suggests the correct type: CustomViewModel | |
| viewController.viewModel = CustomViewModel(data: "hello") | |
| viewController.viewDidLoad() // hello |
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| import UIKit | |
| public class ViewController<T>: UIViewController { | |
| var viewModel: T! | |
| override public func viewDidLoad() { | |
| super.viewDidLoad() | |
| assertViewModel() | |
| } | |
| } | |
| private extension ViewController { | |
| func assertViewModel() { | |
| assert(viewModel != nil) | |
| } | |
| } |
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