ios - 子类 UIViewControllers 的通用类？

Question

我在一些重复太多的遗留代码中有一个展开的转义。我正在努力减少它。

- (IBAction)unwindWithNewData:(UIStoryboardSegue *)segue {
    if ([segue.sourceViewController isKindOfClass:DistantVC1.class]) {
        DistantVC1 *sourceVC = (DistantVC1 *)segue.sourceViewController;
        self.activeUUID = sourceVC.data.uuid;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC2.class]) {
        DistantVC2 *sourceVC = (DistantVC2 *)segue.sourceViewController;
        self.activeUUID = sourceVC.data.uuid;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC3.class]) {
       DistantVC3 *sourceVC = (DistantVC3 *)segue.sourceViewController;
       self.activeUUID = sourceVC.data.uuid;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC4.class]) {
        DistantVC4 *sourceVC = (DistantVC4 *)segue.sourceViewController;
        self.activeUUID = sourceVC.data.uuid;
    }
}

我想在函数顶部存储任何 View Controller 的通用版本，然后用适当的 View Controller 填充它，然后调用 self.activeUUID setter 一次。就像是:

- (IBAction)unwindWithNewData:(UIStoryboardSegue *)segue {
    id sourceVC;
    if ([segue.sourceViewController isKindOfClass:DistantVC1.class]) {
        sourceVC = (DistantVC1 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC2.class]) {
        sourceVC = (DistantVC2 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC3.class]) {
       sourceVC = (DistantVC3 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC4.class]) {
       sourceVC = (DistantVC4 *)segue.sourceViewController;
    }
    self.activeUUID = sourceVC.data.uuid;
}

有任何想法吗？谢谢!

Answer 1

是的，根据评论使用协议(protocol)。

  @protocol ActiveIdProvider
  @property NSString *activeUUID
  @end


  @interface DistantVC1 : UIViewController <ActiveIdProvider> //repeat this block for each DistantVC class you have
  @property NSString *activeUUID
  @end

- (IBAction)unwindWithNewData:(UIStoryboardSegue *)segue {
    ActiveIdProvider *sourceVC;
    if ([segue.sourceViewController isKindOfClass:DistantVC1.class]) {
        sourceVC = (DistantVC1 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC2.class]) {
        sourceVC = (DistantVC2 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC3.class]) {
       sourceVC = (DistantVC3 *)segue.sourceViewController;

    } else if ([segue.sourceViewController isKindOfClass:DistantVC4.class]) {
       sourceVC = (DistantVC4 *)segue.sourceViewController;
    }
    self.activeUUID = sourceVC.data.uuid;
}