delegates

问题 I'm working to build one feature in an app written in Objective-C. I can't post code but I will try to be descriptive with my world. The problem i'm facing is related to delegates. AlphaViewController has ConnectionView as one of its delegate . It helps to add perform some operation on data provided to AlphaViewController and we show output on AlphaViewController's view. When you click on a button in AlphaViewController , I show an UIAlertController . From which I can click a button to open

问题 I'm facing a problem when trying to implement a call to a method fired up by an event which should be defined during run-time. I found this answer: Redirecting to a dynamic method from a generic event handler and implemented that solution, but I keep getting an exception when the method to call is an instance one, not static. Here is my partial code: public class Operation { public bool EventFired { get { return _eventFired; } } private bool _eventFired = false; public void Execute(object

问题 I'm facing a problem when trying to implement a call to a method fired up by an event which should be defined during run-time. I found this answer: Redirecting to a dynamic method from a generic event handler and implemented that solution, but I keep getting an exception when the method to call is an instance one, not static. Here is my partial code: public class Operation { public bool EventFired { get { return _eventFired; } } private bool _eventFired = false; public void Execute(object

问题 Hi I'm trying to retrieve a linkedhashset from the Google datastore but nothing seems to happen. I want to display the results in a Grid using GWT on a page. I have put system.out.println() in all the classes to see where I go wrong but it only shows one and I don't recieve any errors. I use 6 classes 2 in the server package(ContactDAOJdo/ContactServiceImpl) and 4 in the client package(ContactService/ContactServiceAsync/ContactListDelegate/ContactListGui). I hope someone can explain why this

问题 I am coding in swift. I have written a protocol @objc protocol ServerDelegate { optional func onDownloadDataComplete (downloadedData data : [Dictionary<String,Any>],result : ResultType,error : String) } First I received "Method cannot be a member of an @objc protocol because the type of the parameter 2 cannot be represented in Objective-C" for my enum but I fixed it by adding @objc. Now I am receiving this for Array of Dictionary. How to fix it? 回答1: As @originaluser2 said Any cannot be

问题 I am concerned with my 4 view controllers. The first one is the CardWalletViewController which is a table view that is populated by Card Objects that the user has created (the card creation is OK so I won't post the code regarding that). Now, given that this table view is already populated with Card Objects, once the user clicks on a cell, another view controller, named CardDetailsViewController will show up. This will display the current points that the Card has and also the perks. Note that

问题 I am concerned with my 4 view controllers. The first one is the CardWalletViewController which is a table view that is populated by Card Objects that the user has created (the card creation is OK so I won't post the code regarding that). Now, given that this table view is already populated with Card Objects, once the user clicks on a cell, another view controller, named CardDetailsViewController will show up. This will display the current points that the Card has and also the perks. Note that

问题 i want to share data between views... i have the appdelegate of tabbar application: myappdelegate.h #import <UIKit/UIKit.h> @interface myappdelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> { UIWindow *window; UITabBarController *tabBarController; NSString *result; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet UITabBarController *tabBarController; @property (copy , readwrite) NSString *result; @end if i want to call

问题 Is it possible to pass a delegate to a WCF remote object from the client and have the remote object execute the delegate? I would guess not since a delgate is a function pointer for the client process. My goal is to have an interface structure that I can "subscribe" to events from a client to the interface. I would pass a delgate from the client to the interface and I want the interface to be able to execute the event. The idea is to have the ability for the interface to be loaded either the

问题 What is the equivalent C# code for the following VB.NET: Dim moo = Function(x as String) x.ToString() I thought that this should work: var moo = (string x) => x.ToString(); but that yielded a compiler error: Cannot assign lamda expression to an implicitly-typed local variable After some further investigation, I discovered that the type of the variable moo ( moo.GetType() ) in the VB example is VB$AnonymousDelegate_0'2[System.String,System.String] Is there anything equivalent to this in C#?