objective-c - Swift 3 - 父类(super class)方法正在执行而不是它的覆盖对应物

Question

如何重写 ViewControllerA 类中的 ObjC 方法 runThisMethod 和 controller:didChangeObject:，以便应用程序执行对应的方法来自 Swift 子类 ViewControllerC，而不是？在下面的代码中，[ViewControllerA runThisMethod(someParameter)] 将在应用检测到 fetchedResultsController 发生变化时执行(通过 [ViewControllerA controller:didChangeObject:]。有人可以帮我吗看看我错过了什么？

Main.swift

let vc = ViewControllerC.init()
self.myNavigationController?.pushViewController(vc, animated: true)

ViewControllerA.h

@interface ViewControllerA : UIViewController <NSFetchedResultsControllerDelegate>
    @property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController;
    - (void)setUpFetchedResultsController;
    - (void)runThisMethod:(SomeParameterClass *)someParameter;
@end

ViewControllerA.m

@implementation ViewControllerA
    - (void)setUpFetchedResultsController
    {
        // build fetch "request" here
        self.fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:[[MYCoreDataManager sharedCoreDataManager] managedObjectContext] sectionNameKeyPath:nil cacheName:nil];
        self.fetchedResultsController.delegate = self;
    }

    - (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)someParameter atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath
    {
        [self runThisMethod:someParameter]
    }

    - (void)runThisMethod:(SomeParameterClass *)someParameter
    {
        NSLog(@"This method will execute")
    }
@end

ViewControllerB.h

@interface ViewControllerB : ViewControllerA
    // declare a bunch of properties
@end

ViewControllerB.m

@implementation ViewControllerB

    - (void)viewWillAppear:(BOOL)animated {
        [self setUpFetchedResultsController];
    }

@end

ViewControllerC.swift

class ViewControllerC: ViewControllerB {

    override func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange someParameter: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        // this function won't run
        self.runThisMethod(someParameter)
    }

    override func runThisMethod(someParameter){
        // this function won't run
    }
}

Answer 1

当我使用您提到的代码设置一个示例项目时(并设置一个在 ViewControllerB.h 中导入的桥接头文件)，ViewControllerC 上被覆盖的 runThisMethod 正确执行。这是 Xcode 8.2.1。因此，一切似乎都按照您提到的设置正常工作。

您能否上传一个示例项目来展示您提到的行为，以便我们查看？我怀疑某处设置不正确......

您可能没有做的一件事(因为您只提供了部分代码)是在 ViewControllerC 中覆盖 NSFetchedResultsController 的 didChangeObject 委托(delegate)方法。