delegates

问题 I am using QuickBlox-iOS SDK for chatting. Login/Signup is working perfectly. Also I am able to send message but the delegate method - (void)chatDidReceiveMessage:(QBChatMessage *)message; is not getting called. Here's the code I am using to setup chat. Adding the following code in appDelegate : // connect to Chat [[QBChat instance] addDelegate:self]; QBUUser *currentUser = [QBUUser user]; currentUser.ID = [Global sharedInstance].currentUser.ID; currentUser.password = @"password"; [[QBChat

问题 My question is a bit similar to this one: How to convert an action to a defined delegate of the same signature? Why there is no implicit convertion between delegates with same signature. For example, code: class Program { private delegate void Foo1(int x); private delegate void Foo2(int x); static void Main(string[] args) { Foo1 foo1 = Console.WriteLine; Foo2 foo2 = Console.WriteLine; Call(foo1); Call2(foo2); } static void Call(Action<int> action) { action(10); } static void Call2(Foo1 action

问题 Some predefined methods contain a ParamArray in their signature. Delegates, however, cannot contain a ParamArray in their signature. Question: Assume you wish to create a delegation mechanism for a specific method which requires a ParamArray. How would you work around this constraint? EDIT: just to make clear, assume you cannot change the method signatures themselves (pre-defined methods, defined by some 3rd party, be it Microsoft or not). EDIT2: The real deal here is keeping the syntax sugar

问题 This question already has answers here : 2 UITableViews in one UIView (5 answers) Closed 5 years ago . I have one button and two tableViewControllers in one view controller. So, if i will press that button 1st table view controller will appear and it will display some data in rows. If i will select any row in that 1st table view controller, the 2nd table view controller will appear and it will need to display the corresponding data of selected row of 1st table view controller. Here we have to

问题 I have a command button on a winform. So, if I have something like: myButton.Click += MyHandler1; myButton.Click += MyHandler2; myButton.Click += MyHandler3; How can I tell if any particular MyHandler has already been added to the Click event so it doesn't get added again somewhere else in my code? I've read how you can use GetInvocationList() for your own event's information. But I get errors when trying to get the items for my command button using various combinations. It says, "The event

问题 I have some varargs system function, where T is some actual type, like String : sys(T... args) I want to create own function, which delegates to the system function. My function is also a varargs function. I want to pass through all the arguments for my function through to the system function, plus an additional trailing argument. Something like this: myfunc(T... args) { T myobj = new T(); sys(args, myobj); // <- of course, here error. } How do I need to change the line with the error? Now I

问题 I'm really new in iOS/Swift and i'm in a small project. In this project i have a UITableView inside ViewController. And i have another file custom CollectionViewCell in side UITableViewCell. I want when user click a cell in collectionview it will open another ViewController and it get data from this collectionviewcell. This is my uitableview swift file: class IndexRow: UITableViewCell, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout { var names:[String] = ["Movie 1","Movie 2",

问题 Scenario: I am building a scheduling system and each timer event I wanted to run a custom method instead of the usual Timer.Elapsed event. So I wrote something like this. foreach (ScheduleElement schedule in schedules) { TimeSpan timeToRun = CalculateTime(schedule); schedule.Timer = new Timer(timeToRun.TotalMilliseconds); schedule.Timer.Elapsed += delegate { Refresh_Timer(schedule); }; schedule.Timer.AutoReset = true; schedule.Timer.Enabled = true; } Ok so simple enough that actually did

问题 Does anyone know a simple way to manage several tableViews in one viewController? Here is how I've been doing it so far: -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { if(tableView == self.tableView1) return 1; else if(tableView == self.tableView2) return 2; } -(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { if(tableView == self.tableView1) return @"bla"; else if(tableView == self.tableView2) return @"blabla"; } -(NSString *

问题 Really pulling my hair out with this one... I have a C# project with an interface defined as: /* Externally Accessible API */ [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] public interface ISerial { [DispId(1)] bool Startup(); [DispId(2)] bool Shutdown(); [DispId(3)] bool UserInput_FloorButton(int floor_number); [DispId(4)] bool Initialize(); } /* Externally Accesssible Event API */ [InterfaceType(ComInterfaceType.InterfaceIsIDispatch)] public interface ISerialEvent { [DispId(5)]