[英]Calling method in another view controller from modal view controller using a delegate
我正在使用模式搜索来创建要关闭的视图控制器,然后在原始视图控制器中调用方法。 我使用了协议/代理模式,但由于某种原因,从未调用过该方法。 代码如下:请注意,我在这里删除了很多无关的代码以保持其清洁
谢谢!!
VC1:
final class WorkoutViewController: UIViewController, StartWorkoutButtonDelegate {
weak var dataSource: WorkoutViewControllerDataSource!
private var workout: Workout!
private var workoutDataViewController: WorkoutDataViewController?
private var workoutFinishViewController: WorkoutFinishViewController?
private let workoutFinishViewControllerSegueIdentifier = "Workout Finish View Controller Segue"
@IBOutlet private var primaryActionButton: UIButton!
@IBOutlet private var pageControl: UIPageControl!
// MARK: - Handling View Lifecycle
override func viewDidLoad() {
super .viewDidLoad()
let workoutType = dataSource.workoutType(for: self)
workout = Workout(workoutType: workoutType, managedObjectContext: persistentContainer.viewContext)
setPrimaryActionButtonLabel()
}
// MARK: - Handling Storyboard Segues
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if let destinationWorkoutFinishViewController = segue.destination as? WorkoutFinishViewController {
workoutFinishViewController = destinationWorkoutFinishViewController
}
}
// MARK: - Managing Start and Pause
@IBAction func startOrPauseWorkout() {
if workout.isPaused {
startWorkout()
} else {
pauseWorkout()
}
}
}
VC 2:
protocol StartWorkoutButtonDelegate: AnyObject {
func startOrPauseWorkout()
}
class WorkoutFinishViewController: UIViewController {
weak var delegate: StartWorkoutButtonDelegate?
@IBAction func startWorkout() {
self.delegate?.startOrPauseWorkout()
self.dismiss(animated: true, completion: nil)
}
@IBAction func finishWorkout() {
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
在这里设置代表
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
if let destinationWorkoutFinishViewController = segue.destination as? WorkoutFinishViewController {
destinationWorkoutFinishViewController.delegate = self
}
}
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