プロトコルでStoryboardともっと仲良くなる

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-FHBDZ1BUUFSOPG QSFQBSF'PS4FHVF - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([segue.identifier isEqualToString:@"second"])
{ SecondViewController *vc = segue.destinationViewController; vc.message = self.message; } } 0CKFDUJWF$ override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if segue.identifier == "second" { let second = segue.destination as! SecondViewController second.message = message } } 4XJGU

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6TJOHEFTUJOBUJPO override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if
let second = segue.destination as? SecondViewController { second.message = message } } override func prepare(for segue: UIStoryboardSegue, sender: Any?) { switch segue.destination { case let second as SecondViewController: second.message = message default: break } } *GMFU TXJUDIMFU

let second = segue.destination as? SecondViewController { second.message = message } } override func prepare(for segue: UIStoryboardSegue, sender: Any?) { switch segue.destination { case let second as SecondViewController: second.message = message default: break } } *GMFU TXJUDIMFU UZQFTBGFDBTUͰΫϥογϡճආ

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.VMUJQMF%FTUJOBUJPO class SecondViewController: UIViewController { var message: Message = Message(value:
"") } class ThirdViewController: UIViewController { var message: Message = Message(value: "") }

.VMUJQMF%FTUJOBUJPO override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if
let second = segue.destination as? SecondViewController { second.message = message } if let third = segue.destination as? ThirdViewController { third.message = message } }

.VMUJQMF%FTUJOBUJPO override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if
let second = segue.destination as? SecondViewController { second.message = message } if let third = segue.destination as? ThirdViewController { third.message = message } } ಉ͡ϓϩύςΟΛ࣋ͭผͷ 7JFX$POUSPMMFS͕૿͑Δ౓ʹܕ νΣοΫͷίʔυ͕૿͑Δʜ

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.FTTBHF7JFX1SPUPDPM protocol MessageView: class { var message: Message { get
set } } class SecondViewController: UIViewController, MessageView { var message: Message = Message(value: "") } class ThirdViewController: UIViewController, MessageView { var message: Message = Message(value: "") }

1SPUPDPM0SJFOUFE4FHVF override func prepare(for segue: UIStoryboardSegue, sender: Any?) { if
let messageView = segue.destination as? MessageView { messageView.message = message } }

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EFTUJOBUJPOJOTJEF OBWJHBUJPOUBC#BS extension UIStoryboardSegue { var embeddedDestination: UIViewController { return
detectDestination(destination) } } private extension UIStoryboardSegue { func detectDestination(_ vc: UIViewController) -> UIViewController { switch vc { case let nav as UINavigationController: guard let top = nav.topViewController else { return nav } return detectDestination(top) case let tab as UITabBarController: guard let sel = tab.selectedViewController else { return tab } return detectDestination(sel) default: return vc } } }

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プロトコルでStoryboardともっと仲良くなる

プロトコルでStoryboardともっと仲良くなる

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